Initial Import: rustc-demangle-0.1.20 am: 813ee2753a

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/rustc-demangle/+/1798349

Change-Id: I22a80e53bba89be7340f4602dfa80106db11bfc3

16 files changed, 3026 insertions, 0 deletions

diff --git a/.cargo_vcs_info.json b/.cargo_vcs_info.json
new file mode 100644
index 0000000..ceed88a
--- /dev/null
+++ b/.cargo_vcs_info.json
@@ -0,0 +1,5 @@
+{
+  "git": {
+    "sha1": "b1bbc0d5c180da20c633e7939bccf673daa736d9"
+  }
+}
diff --git a/.github/dependabot.yml b/.github/dependabot.yml
new file mode 100644
index 0000000..7377d37
--- /dev/null
+++ b/.github/dependabot.yml
@@ -0,0 +1,8 @@
+version: 2
+updates:
+- package-ecosystem: cargo
+  directory: "/"
+  schedule:
+    interval: daily
+    time: "08:00"
+  open-pull-requests-limit: 10
diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
new file mode 100644
index 0000000..6ae8d0c
--- /dev/null
+++ b/.github/workflows/main.yml
@@ -0,0 +1,54 @@
+name: CI
+on: [push, pull_request]
+
+jobs:
+  test:
+    name: Test
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        rust: [stable, beta, nightly]
+    steps:
+    - uses: actions/checkout@v2
+    - name: Install Rust
+      run: rustup update ${{ matrix.rust }} && rustup default ${{ matrix.rust }}
+    - run: cargo build --all
+    - run: cargo test --all
+
+  fuzz_targets:
+    name: Fuzz Targets
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    # Note that building with fuzzers requires nightly since it uses unstable
+    # flags to rustc.
+    - run: rustup update nightly && rustup default nightly
+    - run: cargo install cargo-fuzz --vers "^0.10"
+    - run: cargo fuzz build --dev
+
+  rustfmt:
+    name: Rustfmt
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: Install Rust
+      run: rustup update stable && rustup default stable && rustup component add rustfmt
+    - run: cargo fmt -- --check
+
+  publish_docs:
+    name: Publish Documentation
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Install Rust
+        run: rustup update stable && rustup default stable
+      - name: Build documentation
+        run: cargo doc --no-deps
+      - name: Publish documentation
+        run: |
+          cd target/doc
+          git init
+          git add .
+          git -c user.name='ci' -c user.email='ci' commit -m init
+          git push -f -q https://git:${{ secrets.github_token }}@github.com/${{ github.repository }} HEAD:gh-pages
+        if: github.event_name == 'push' && github.event.ref == 'refs/heads/main'
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..a9d37c5
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+target
+Cargo.lock
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..c813375
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,35 @@
+# THIS FILE IS AUTOMATICALLY GENERATED BY CARGO
+#
+# When uploading crates to the registry Cargo will automatically
+# "normalize" Cargo.toml files for maximal compatibility
+# with all versions of Cargo and also rewrite `path` dependencies
+# to registry (e.g., crates.io) dependencies
+#
+# If you believe there's an error in this file please file an
+# issue against the rust-lang/cargo repository. If you're
+# editing this file be aware that the upstream Cargo.toml
+# will likely look very different (and much more reasonable)
+
+[package]
+name = "rustc-demangle"
+version = "0.1.20"
+authors = ["Alex Crichton <alex@alexcrichton.com>"]
+description = "Rust compiler symbol demangling.\n"
+homepage = "https://github.com/alexcrichton/rustc-demangle"
+documentation = "https://docs.rs/rustc-demangle"
+readme = "README.md"
+license = "MIT/Apache-2.0"
+repository = "https://github.com/alexcrichton/rustc-demangle"
+[profile.release]
+lto = true
+[dependencies.compiler_builtins]
+version = "0.1.2"
+optional = true
+
+[dependencies.core]
+version = "1.0.0"
+optional = true
+package = "rustc-std-workspace-core"
+
+[features]
+rustc-dep-of-std = ["core", "compiler_builtins"]
diff --git a/Cargo.toml.orig b/Cargo.toml.orig
new file mode 100644
index 0000000..6c244a4
--- /dev/null
+++ b/Cargo.toml.orig
@@ -0,0 +1,25 @@
+[package]
+name = "rustc-demangle"
+version = "0.1.20"
+authors = ["Alex Crichton <alex@alexcrichton.com>"]
+license = "MIT/Apache-2.0"
+readme = "README.md"
+repository = "https://github.com/alexcrichton/rustc-demangle"
+homepage = "https://github.com/alexcrichton/rustc-demangle"
+documentation = "https://docs.rs/rustc-demangle"
+description = """
+Rust compiler symbol demangling.
+"""
+
+[workspace]
+members = ["crates/capi", "fuzz"]
+
+[dependencies]
+core = { version = '1.0.0', optional = true, package = 'rustc-std-workspace-core' }
+compiler_builtins = { version = '0.1.2', optional = true }
+
+[features]
+rustc-dep-of-std = ['core', 'compiler_builtins']
+
+[profile.release]
+lto = true
diff --git a/LICENSE b/LICENSE
new file mode 120000
index 0000000..6b579aa
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1 @@
+LICENSE-APACHE
\ No newline at end of file
diff --git a/LICENSE-APACHE b/LICENSE-APACHE
new file mode 100644
index 0000000..16fe87b
--- /dev/null
+++ b/LICENSE-APACHE
@@ -0,0 +1,201 @@
+                              Apache License
+                        Version 2.0, January 2004
+                     http://www.apache.org/licenses/
+
+TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
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+   agreed to in writing, Licensor provides the Work (and each
+   Contributor provides its Contributions) on an "AS IS" BASIS,
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+8. Limitation of Liability. In no event and under no legal theory,
+   whether in tort (including negligence), contract, or otherwise,
+   unless required by applicable law (such as deliberate and grossly
+   negligent acts) or agreed to in writing, shall any Contributor be
+   liable to You for damages, including any direct, indirect, special,
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+APPENDIX: How to apply the Apache License to your work.
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+Copyright [yyyy] [name of copyright owner]
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+	http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
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diff --git a/LICENSE-MIT b/LICENSE-MIT
new file mode 100644
index 0000000..39e0ed6
--- /dev/null
+++ b/LICENSE-MIT
@@ -0,0 +1,25 @@
+Copyright (c) 2014 Alex Crichton
+
+Permission is hereby granted, free of charge, to any
+person obtaining a copy of this software and associated
+documentation files (the "Software"), to deal in the
+Software without restriction, including without
+limitation the rights to use, copy, modify, merge,
+publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software
+is furnished to do so, subject to the following
+conditions:
+
+The above copyright notice and this permission notice
+shall be included in all copies or substantial portions
+of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
+ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
+TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
+PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
+SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
+IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.
diff --git a/METADATA b/METADATA
new file mode 100644
index 0000000..f99d6ac
--- /dev/null
+++ b/METADATA
@@ -0,0 +1,20 @@
+name: "rustc-demangle"
+description: "Rust compiler symbol demangling."
+third_party {
+  url {
+    type: HOMEPAGE
+    value: "https://crates.io/crates/rustc-demangle"
+  }
+  url {
+    type: ARCHIVE
+    value: "https://static.crates.io/crates/rustc-demangle/rustc-demangle-0.1.20.crate"
+  }
+  version: "0.1.20"
+  # Dual-licensed, using the least restrictive per go/thirdpartylicenses#same.
+  license_type: NOTICE
+  last_upgrade_date {
+    year: 2021
+    month: 8
+    day: 17
+  }
+}
diff --git a/MODULE_LICENSE_APACHE2 b/MODULE_LICENSE_APACHE2
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/MODULE_LICENSE_APACHE2
diff --git a/OWNERS b/OWNERS
new file mode 100644
index 0000000..45dc4dd
--- /dev/null
+++ b/OWNERS
@@ -0,0 +1 @@
+include platform/prebuilts/rust:master:/OWNERS
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..0833e1e
--- /dev/null
+++ b/README.md
@@ -0,0 +1,48 @@
+# rustc-demangle
+
+Demangling for Rust symbols, written in Rust.
+
+[Documentation](https://docs.rs/rustc-demangle)
+
+## Usage
+
+You can add this as a dependency via your `Cargo.toml`
+
+```toml
+[dependencies]
+rustc-demangle = "0.1"
+```
+
+and then be sure to check out the [crate
+documentation](https://docs.rs/rustc-demangle) for usage.
+
+## Usage from non-Rust languages
+
+You can also use this crate from other languages via the C API wrapper in the
+`crates/capi` directory. This can be build with:
+
+```sh
+$ cargo build -p rustc-demangle-capi --release
+```
+
+You'll then find `target/release/librustc_demangle.a` and
+`target/release/librustc_demangle.so` (or a different name depending on your
+platform). These objects implement the interface specified in
+`crates/capi/include/rustc_demangle.h`.
+
+# License
+
+This project is licensed under either of
+
+ * Apache License, Version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or
+   http://www.apache.org/licenses/LICENSE-2.0)
+ * MIT license ([LICENSE-MIT](LICENSE-MIT) or
+   http://opensource.org/licenses/MIT)
+
+at your option.
+
+### Contribution
+
+Unless you explicitly state otherwise, any contribution intentionally submitted
+for inclusion in rustc-demangle you, as defined in the Apache-2.0 license, shall
+be dual licensed as above, without any additional terms or conditions.
diff --git a/src/legacy.rs b/src/legacy.rs
new file mode 100644
index 0000000..d55f3a1
--- /dev/null
+++ b/src/legacy.rs
@@ -0,0 +1,392 @@
+use core::char;
+use core::fmt;
+
+/// Representation of a demangled symbol name.
+pub struct Demangle<'a> {
+    inner: &'a str,
+    /// The number of ::-separated elements in the original name.
+    elements: usize,
+}
+
+/// De-mangles a Rust symbol into a more readable version
+///
+/// All Rust symbols by default are mangled as they contain characters that
+/// cannot be represented in all object files. The mangling mechanism is similar
+/// to C++'s, but Rust has a few specifics to handle items like lifetimes in
+/// symbols.
+///
+/// This function will take a **mangled** symbol and return a value. When printed,
+/// the de-mangled version will be written. If the symbol does not look like
+/// a mangled symbol, the original value will be written instead.
+///
+/// # Examples
+///
+/// ```
+/// use rustc_demangle::demangle;
+///
+/// assert_eq!(demangle("_ZN4testE").to_string(), "test");
+/// assert_eq!(demangle("_ZN3foo3barE").to_string(), "foo::bar");
+/// assert_eq!(demangle("foo").to_string(), "foo");
+/// ```
+
+// All Rust symbols are in theory lists of "::"-separated identifiers. Some
+// assemblers, however, can't handle these characters in symbol names. To get
+// around this, we use C++-style mangling. The mangling method is:
+//
+// 1. Prefix the symbol with "_ZN"
+// 2. For each element of the path, emit the length plus the element
+// 3. End the path with "E"
+//
+// For example, "_ZN4testE" => "test" and "_ZN3foo3barE" => "foo::bar".
+//
+// We're the ones printing our backtraces, so we can't rely on anything else to
+// demangle our symbols. It's *much* nicer to look at demangled symbols, so
+// this function is implemented to give us nice pretty output.
+//
+// Note that this demangler isn't quite as fancy as it could be. We have lots
+// of other information in our symbols like hashes, version, type information,
+// etc. Additionally, this doesn't handle glue symbols at all.
+pub fn demangle(s: &str) -> Result<(Demangle, &str), ()> {
+    // First validate the symbol. If it doesn't look like anything we're
+    // expecting, we just print it literally. Note that we must handle non-Rust
+    // symbols because we could have any function in the backtrace.
+    let inner = if s.starts_with("_ZN") {
+        &s[3..]
+    } else if s.starts_with("ZN") {
+        // On Windows, dbghelp strips leading underscores, so we accept "ZN...E"
+        // form too.
+        &s[2..]
+    } else if s.starts_with("__ZN") {
+        // On OSX, symbols are prefixed with an extra _
+        &s[4..]
+    } else {
+        return Err(());
+    };
+
+    // only work with ascii text
+    if inner.bytes().any(|c| c & 0x80 != 0) {
+        return Err(());
+    }
+
+    let mut elements = 0;
+    let mut chars = inner.chars();
+    let mut c = chars.next().ok_or(())?;
+    while c != 'E' {
+        // Decode an identifier element's length.
+        if !c.is_digit(10) {
+            return Err(());
+        }
+        let mut len = 0usize;
+        while let Some(d) = c.to_digit(10) {
+            len = len
+                .checked_mul(10)
+                .and_then(|len| len.checked_add(d as usize))
+                .ok_or(())?;
+            c = chars.next().ok_or(())?;
+        }
+
+        // `c` already contains the first character of this identifier, skip it and
+        // all the other characters of this identifier, to reach the next element.
+        for _ in 0..len {
+            c = chars.next().ok_or(())?;
+        }
+
+        elements += 1;
+    }
+
+    Ok((Demangle { inner, elements }, chars.as_str()))
+}
+
+// Rust hashes are hex digits with an `h` prepended.
+fn is_rust_hash(s: &str) -> bool {
+    s.starts_with('h') && s[1..].chars().all(|c| c.is_digit(16))
+}
+
+impl<'a> fmt::Display for Demangle<'a> {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        // Alright, let's do this.
+        let mut inner = self.inner;
+        for element in 0..self.elements {
+            let mut rest = inner;
+            while rest.chars().next().unwrap().is_digit(10) {
+                rest = &rest[1..];
+            }
+            let i: usize = inner[..(inner.len() - rest.len())].parse().unwrap();
+            inner = &rest[i..];
+            rest = &rest[..i];
+            // Skip printing the hash if alternate formatting
+            // was requested.
+            if f.alternate() && element + 1 == self.elements && is_rust_hash(&rest) {
+                break;
+            }
+            if element != 0 {
+                f.write_str("::")?;
+            }
+            if rest.starts_with("_$") {
+                rest = &rest[1..];
+            }
+            loop {
+                if rest.starts_with('.') {
+                    if let Some('.') = rest[1..].chars().next() {
+                        f.write_str("::")?;
+                        rest = &rest[2..];
+                    } else {
+                        f.write_str(".")?;
+                        rest = &rest[1..];
+                    }
+                } else if rest.starts_with('$') {
+                    let (escape, after_escape) = if let Some(end) = rest[1..].find('$') {
+                        (&rest[1..=end], &rest[end + 2..])
+                    } else {
+                        break;
+                    };
+
+                    // see src/librustc_codegen_utils/symbol_names/legacy.rs for these mappings
+                    let unescaped = match escape {
+                        "SP" => "@",
+                        "BP" => "*",
+                        "RF" => "&",
+                        "LT" => "<",
+                        "GT" => ">",
+                        "LP" => "(",
+                        "RP" => ")",
+                        "C" => ",",
+
+                        _ => {
+                            if escape.starts_with('u') {
+                                let digits = &escape[1..];
+                                let all_lower_hex = digits.chars().all(|c| match c {
+                                    '0'..='9' | 'a'..='f' => true,
+                                    _ => false,
+                                });
+                                let c = u32::from_str_radix(digits, 16)
+                                    .ok()
+                                    .and_then(char::from_u32);
+                                if let (true, Some(c)) = (all_lower_hex, c) {
+                                    // FIXME(eddyb) do we need to filter out control codepoints?
+                                    if !c.is_control() {
+                                        c.fmt(f)?;
+                                        rest = after_escape;
+                                        continue;
+                                    }
+                                }
+                            }
+                            break;
+                        }
+                    };
+                    f.write_str(unescaped)?;
+                    rest = after_escape;
+                } else if let Some(i) = rest.find(|c| c == '$' || c == '.') {
+                    f.write_str(&rest[..i])?;
+                    rest = &rest[i..];
+                } else {
+                    break;
+                }
+            }
+            f.write_str(rest)?;
+        }
+
+        Ok(())
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use std::prelude::v1::*;
+
+    macro_rules! t {
+        ($a:expr, $b:expr) => {
+            assert!(ok($a, $b))
+        };
+    }
+
+    macro_rules! t_err {
+        ($a:expr) => {
+            assert!(ok_err($a))
+        };
+    }
+
+    macro_rules! t_nohash {
+        ($a:expr, $b:expr) => {{
+            assert_eq!(format!("{:#}", ::demangle($a)), $b);
+        }};
+    }
+
+    fn ok(sym: &str, expected: &str) -> bool {
+        match ::try_demangle(sym) {
+            Ok(s) => {
+                if s.to_string() == expected {
+                    true
+                } else {
+                    println!("\n{}\n!=\n{}\n", s, expected);
+                    false
+                }
+            }
+            Err(_) => {
+                println!("error demangling");
+                false
+            }
+        }
+    }
+
+    fn ok_err(sym: &str) -> bool {
+        match ::try_demangle(sym) {
+            Ok(_) => {
+                println!("succeeded in demangling");
+                false
+            }
+            Err(_) => ::demangle(sym).to_string() == sym,
+        }
+    }
+
+    #[test]
+    fn demangle() {
+        t_err!("test");
+        t!("_ZN4testE", "test");
+        t_err!("_ZN4test");
+        t!("_ZN4test1a2bcE", "test::a::bc");
+    }
+
+    #[test]
+    fn demangle_dollars() {
+        t!("_ZN4$RP$E", ")");
+        t!("_ZN8$RF$testE", "&test");
+        t!("_ZN8$BP$test4foobE", "*test::foob");
+        t!("_ZN9$u20$test4foobE", " test::foob");
+        t!("_ZN35Bar$LT$$u5b$u32$u3b$$u20$4$u5d$$GT$E", "Bar<[u32; 4]>");
+    }
+
+    #[test]
+    fn demangle_many_dollars() {
+        t!("_ZN13test$u20$test4foobE", "test test::foob");
+        t!("_ZN12test$BP$test4foobE", "test*test::foob");
+    }
+
+    #[test]
+    fn demangle_osx() {
+        t!(
+            "__ZN5alloc9allocator6Layout9for_value17h02a996811f781011E",
+            "alloc::allocator::Layout::for_value::h02a996811f781011"
+        );
+        t!("__ZN38_$LT$core..option..Option$LT$T$GT$$GT$6unwrap18_MSG_FILE_LINE_COL17haf7cb8d5824ee659E", "<core::option::Option<T>>::unwrap::_MSG_FILE_LINE_COL::haf7cb8d5824ee659");
+        t!("__ZN4core5slice89_$LT$impl$u20$core..iter..traits..IntoIterator$u20$for$u20$$RF$$u27$a$u20$$u5b$T$u5d$$GT$9into_iter17h450e234d27262170E", "core::slice::<impl core::iter::traits::IntoIterator for &'a [T]>::into_iter::h450e234d27262170");
+    }
+
+    #[test]
+    fn demangle_windows() {
+        t!("ZN4testE", "test");
+        t!("ZN13test$u20$test4foobE", "test test::foob");
+        t!("ZN12test$RF$test4foobE", "test&test::foob");
+    }
+
+    #[test]
+    fn demangle_elements_beginning_with_underscore() {
+        t!("_ZN13_$LT$test$GT$E", "<test>");
+        t!("_ZN28_$u7b$$u7b$closure$u7d$$u7d$E", "{{closure}}");
+        t!("_ZN15__STATIC_FMTSTRE", "__STATIC_FMTSTR");
+    }
+
+    #[test]
+    fn demangle_trait_impls() {
+        t!(
+            "_ZN71_$LT$Test$u20$$u2b$$u20$$u27$static$u20$as$u20$foo..Bar$LT$Test$GT$$GT$3barE",
+            "<Test + 'static as foo::Bar<Test>>::bar"
+        );
+    }
+
+    #[test]
+    fn demangle_without_hash() {
+        let s = "_ZN3foo17h05af221e174051e9E";
+        t!(s, "foo::h05af221e174051e9");
+        t_nohash!(s, "foo");
+    }
+
+    #[test]
+    fn demangle_without_hash_edgecases() {
+        // One element, no hash.
+        t_nohash!("_ZN3fooE", "foo");
+        // Two elements, no hash.
+        t_nohash!("_ZN3foo3barE", "foo::bar");
+        // Longer-than-normal hash.
+        t_nohash!("_ZN3foo20h05af221e174051e9abcE", "foo");
+        // Shorter-than-normal hash.
+        t_nohash!("_ZN3foo5h05afE", "foo");
+        // Valid hash, but not at the end.
+        t_nohash!("_ZN17h05af221e174051e93fooE", "h05af221e174051e9::foo");
+        // Not a valid hash, missing the 'h'.
+        t_nohash!("_ZN3foo16ffaf221e174051e9E", "foo::ffaf221e174051e9");
+        // Not a valid hash, has a non-hex-digit.
+        t_nohash!("_ZN3foo17hg5af221e174051e9E", "foo::hg5af221e174051e9");
+    }
+
+    #[test]
+    fn demangle_thinlto() {
+        // One element, no hash.
+        t!("_ZN3fooE.llvm.9D1C9369", "foo");
+        t!("_ZN3fooE.llvm.9D1C9369@@16", "foo");
+        t_nohash!(
+            "_ZN9backtrace3foo17hbb467fcdaea5d79bE.llvm.A5310EB9",
+            "backtrace::foo"
+        );
+    }
+
+    #[test]
+    fn demangle_llvm_ir_branch_labels() {
+        t!("_ZN4core5slice77_$LT$impl$u20$core..ops..index..IndexMut$LT$I$GT$$u20$for$u20$$u5b$T$u5d$$GT$9index_mut17haf9727c2edfbc47bE.exit.i.i", "core::slice::<impl core::ops::index::IndexMut<I> for [T]>::index_mut::haf9727c2edfbc47b.exit.i.i");
+        t_nohash!("_ZN4core5slice77_$LT$impl$u20$core..ops..index..IndexMut$LT$I$GT$$u20$for$u20$$u5b$T$u5d$$GT$9index_mut17haf9727c2edfbc47bE.exit.i.i", "core::slice::<impl core::ops::index::IndexMut<I> for [T]>::index_mut.exit.i.i");
+    }
+
+    #[test]
+    fn demangle_ignores_suffix_that_doesnt_look_like_a_symbol() {
+        t_err!("_ZN3fooE.llvm moocow");
+    }
+
+    #[test]
+    fn dont_panic() {
+        ::demangle("_ZN2222222222222222222222EE").to_string();
+        ::demangle("_ZN5*70527e27.ll34csaғE").to_string();
+        ::demangle("_ZN5*70527a54.ll34_$b.1E").to_string();
+        ::demangle(
+            "\
+             _ZN5~saäb4e\n\
+             2734cOsbE\n\
+             5usage20h)3\0\0\0\0\0\0\07e2734cOsbE\
+             ",
+        )
+        .to_string();
+    }
+
+    #[test]
+    fn invalid_no_chop() {
+        t_err!("_ZNfooE");
+    }
+
+    #[test]
+    fn handle_assoc_types() {
+        t!("_ZN151_$LT$alloc..boxed..Box$LT$alloc..boxed..FnBox$LT$A$C$$u20$Output$u3d$R$GT$$u20$$u2b$$u20$$u27$a$GT$$u20$as$u20$core..ops..function..FnOnce$LT$A$GT$$GT$9call_once17h69e8f44b3723e1caE", "<alloc::boxed::Box<alloc::boxed::FnBox<A, Output=R> + 'a> as core::ops::function::FnOnce<A>>::call_once::h69e8f44b3723e1ca");
+    }
+
+    #[test]
+    fn handle_bang() {
+        t!(
+            "_ZN88_$LT$core..result..Result$LT$$u21$$C$$u20$E$GT$$u20$as$u20$std..process..Termination$GT$6report17hfc41d0da4a40b3e8E",
+            "<core::result::Result<!, E> as std::process::Termination>::report::hfc41d0da4a40b3e8"
+        );
+    }
+
+    #[test]
+    fn demangle_utf8_idents() {
+        t_nohash!(
+            "_ZN11utf8_idents157_$u10e1$$u10d0$$u10ed$$u10db$$u10d4$$u10da$$u10d0$$u10d3$_$u10d2$$u10d4$$u10db$$u10e0$$u10d8$$u10d4$$u10da$$u10d8$_$u10e1$$u10d0$$u10d3$$u10d8$$u10da$$u10d8$17h21634fd5714000aaE",
+            "utf8_idents::საჭმელად_გემრიელი_სადილი"
+        );
+    }
+
+    #[test]
+    fn demangle_issue_60925() {
+        t_nohash!(
+            "_ZN11issue_609253foo37Foo$LT$issue_60925..llv$u6d$..Foo$GT$3foo17h059a991a004536adE",
+            "issue_60925::foo::Foo<issue_60925::llvm::Foo>::foo"
+        );
+    }
+}
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..7adc0c7
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,398 @@
+//! Demangle Rust compiler symbol names.
+//!
+//! This crate provides a `demangle` function which will return a `Demangle`
+//! sentinel value that can be used to learn about the demangled version of a
+//! symbol name. The demangled representation will be the same as the original
+//! if it doesn't look like a mangled symbol name.
+//!
+//! `Demangle` can be formatted with the `Display` trait. The alternate
+//! modifier (`#`) can be used to format the symbol name without the
+//! trailing hash value.
+//!
+//! # Examples
+//!
+//! ```
+//! use rustc_demangle::demangle;
+//!
+//! assert_eq!(demangle("_ZN4testE").to_string(), "test");
+//! assert_eq!(demangle("_ZN3foo3barE").to_string(), "foo::bar");
+//! assert_eq!(demangle("foo").to_string(), "foo");
+//! // With hash
+//! assert_eq!(format!("{}", demangle("_ZN3foo17h05af221e174051e9E")), "foo::h05af221e174051e9");
+//! // Without hash
+//! assert_eq!(format!("{:#}", demangle("_ZN3foo17h05af221e174051e9E")), "foo");
+//! ```
+
+#![no_std]
+#![deny(missing_docs)]
+
+#[cfg(test)]
+#[macro_use]
+extern crate std;
+
+mod legacy;
+mod v0;
+
+use core::fmt;
+
+/// Representation of a demangled symbol name.
+pub struct Demangle<'a> {
+    style: Option<DemangleStyle<'a>>,
+    original: &'a str,
+    suffix: &'a str,
+}
+
+enum DemangleStyle<'a> {
+    Legacy(legacy::Demangle<'a>),
+    V0(v0::Demangle<'a>),
+}
+
+/// De-mangles a Rust symbol into a more readable version
+///
+/// This function will take a **mangled** symbol and return a value. When printed,
+/// the de-mangled version will be written. If the symbol does not look like
+/// a mangled symbol, the original value will be written instead.
+///
+/// # Examples
+///
+/// ```
+/// use rustc_demangle::demangle;
+///
+/// assert_eq!(demangle("_ZN4testE").to_string(), "test");
+/// assert_eq!(demangle("_ZN3foo3barE").to_string(), "foo::bar");
+/// assert_eq!(demangle("foo").to_string(), "foo");
+/// ```
+pub fn demangle(mut s: &str) -> Demangle {
+    // During ThinLTO LLVM may import and rename internal symbols, so strip out
+    // those endings first as they're one of the last manglings applied to symbol
+    // names.
+    let llvm = ".llvm.";
+    if let Some(i) = s.find(llvm) {
+        let candidate = &s[i + llvm.len()..];
+        let all_hex = candidate.chars().all(|c| match c {
+            'A'..='F' | '0'..='9' | '@' => true,
+            _ => false,
+        });
+
+        if all_hex {
+            s = &s[..i];
+        }
+    }
+
+    let mut suffix = "";
+    let mut style = match legacy::demangle(s) {
+        Ok((d, s)) => {
+            suffix = s;
+            Some(DemangleStyle::Legacy(d))
+        }
+        Err(()) => match v0::demangle(s) {
+            Ok((d, s)) => {
+                suffix = s;
+                Some(DemangleStyle::V0(d))
+            }
+            Err(v0::Invalid) => None,
+        },
+    };
+
+    // Output like LLVM IR adds extra period-delimited words. See if
+    // we are in that case and save the trailing words if so.
+    if !suffix.is_empty() {
+        if suffix.starts_with('.') && is_symbol_like(suffix) {
+            // Keep the suffix.
+        } else {
+            // Reset the suffix and invalidate the demangling.
+            suffix = "";
+            style = None;
+        }
+    }
+
+    Demangle {
+        style,
+        original: s,
+        suffix,
+    }
+}
+
+/// Error returned from the `try_demangle` function below when demangling fails.
+#[derive(Debug, Clone)]
+pub struct TryDemangleError {
+    _priv: (),
+}
+
+/// The same as `demangle`, except return an `Err` if the string does not appear
+/// to be a Rust symbol, rather than "demangling" the given string as a no-op.
+///
+/// ```
+/// extern crate rustc_demangle;
+///
+/// let not_a_rust_symbol = "la la la";
+///
+/// // The `try_demangle` function will reject strings which are not Rust symbols.
+/// assert!(rustc_demangle::try_demangle(not_a_rust_symbol).is_err());
+///
+/// // While `demangle` will just pass the non-symbol through as a no-op.
+/// assert_eq!(rustc_demangle::demangle(not_a_rust_symbol).as_str(), not_a_rust_symbol);
+/// ```
+pub fn try_demangle(s: &str) -> Result<Demangle, TryDemangleError> {
+    let sym = demangle(s);
+    if sym.style.is_some() {
+        Ok(sym)
+    } else {
+        Err(TryDemangleError { _priv: () })
+    }
+}
+
+impl<'a> Demangle<'a> {
+    /// Returns the underlying string that's being demangled.
+    pub fn as_str(&self) -> &'a str {
+        self.original
+    }
+}
+
+fn is_symbol_like(s: &str) -> bool {
+    s.chars().all(|c| {
+        // Once `char::is_ascii_punctuation` and `char::is_ascii_alphanumeric`
+        // have been stable for long enough, use those instead for clarity
+        is_ascii_alphanumeric(c) || is_ascii_punctuation(c)
+    })
+}
+
+// Copied from the documentation of `char::is_ascii_alphanumeric`
+fn is_ascii_alphanumeric(c: char) -> bool {
+    match c {
+        '\u{0041}'..='\u{005A}' | '\u{0061}'..='\u{007A}' | '\u{0030}'..='\u{0039}' => true,
+        _ => false,
+    }
+}
+
+// Copied from the documentation of `char::is_ascii_punctuation`
+fn is_ascii_punctuation(c: char) -> bool {
+    match c {
+        '\u{0021}'..='\u{002F}'
+        | '\u{003A}'..='\u{0040}'
+        | '\u{005B}'..='\u{0060}'
+        | '\u{007B}'..='\u{007E}' => true,
+        _ => false,
+    }
+}
+
+impl<'a> fmt::Display for Demangle<'a> {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        match self.style {
+            None => f.write_str(self.original)?,
+            Some(DemangleStyle::Legacy(ref d)) => fmt::Display::fmt(d, f)?,
+            Some(DemangleStyle::V0(ref d)) => fmt::Display::fmt(d, f)?,
+        }
+        f.write_str(self.suffix)
+    }
+}
+
+impl<'a> fmt::Debug for Demangle<'a> {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        fmt::Display::fmt(self, f)
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use std::prelude::v1::*;
+
+    macro_rules! t {
+        ($a:expr, $b:expr) => {
+            assert!(ok($a, $b))
+        };
+    }
+
+    macro_rules! t_err {
+        ($a:expr) => {
+            assert!(ok_err($a))
+        };
+    }
+
+    macro_rules! t_nohash {
+        ($a:expr, $b:expr) => {{
+            assert_eq!(format!("{:#}", super::demangle($a)), $b);
+        }};
+    }
+
+    fn ok(sym: &str, expected: &str) -> bool {
+        match super::try_demangle(sym) {
+            Ok(s) => {
+                if s.to_string() == expected {
+                    true
+                } else {
+                    println!("\n{}\n!=\n{}\n", s, expected);
+                    false
+                }
+            }
+            Err(_) => {
+                println!("error demangling");
+                false
+            }
+        }
+    }
+
+    fn ok_err(sym: &str) -> bool {
+        match super::try_demangle(sym) {
+            Ok(_) => {
+                println!("succeeded in demangling");
+                false
+            }
+            Err(_) => super::demangle(sym).to_string() == sym,
+        }
+    }
+
+    #[test]
+    fn demangle() {
+        t_err!("test");
+        t!("_ZN4testE", "test");
+        t_err!("_ZN4test");
+        t!("_ZN4test1a2bcE", "test::a::bc");
+    }
+
+    #[test]
+    fn demangle_dollars() {
+        t!("_ZN4$RP$E", ")");
+        t!("_ZN8$RF$testE", "&test");
+        t!("_ZN8$BP$test4foobE", "*test::foob");
+        t!("_ZN9$u20$test4foobE", " test::foob");
+        t!("_ZN35Bar$LT$$u5b$u32$u3b$$u20$4$u5d$$GT$E", "Bar<[u32; 4]>");
+    }
+
+    #[test]
+    fn demangle_many_dollars() {
+        t!("_ZN13test$u20$test4foobE", "test test::foob");
+        t!("_ZN12test$BP$test4foobE", "test*test::foob");
+    }
+
+    #[test]
+    fn demangle_osx() {
+        t!(
+            "__ZN5alloc9allocator6Layout9for_value17h02a996811f781011E",
+            "alloc::allocator::Layout::for_value::h02a996811f781011"
+        );
+        t!("__ZN38_$LT$core..option..Option$LT$T$GT$$GT$6unwrap18_MSG_FILE_LINE_COL17haf7cb8d5824ee659E", "<core::option::Option<T>>::unwrap::_MSG_FILE_LINE_COL::haf7cb8d5824ee659");
+        t!("__ZN4core5slice89_$LT$impl$u20$core..iter..traits..IntoIterator$u20$for$u20$$RF$$u27$a$u20$$u5b$T$u5d$$GT$9into_iter17h450e234d27262170E", "core::slice::<impl core::iter::traits::IntoIterator for &'a [T]>::into_iter::h450e234d27262170");
+    }
+
+    #[test]
+    fn demangle_windows() {
+        t!("ZN4testE", "test");
+        t!("ZN13test$u20$test4foobE", "test test::foob");
+        t!("ZN12test$RF$test4foobE", "test&test::foob");
+    }
+
+    #[test]
+    fn demangle_elements_beginning_with_underscore() {
+        t!("_ZN13_$LT$test$GT$E", "<test>");
+        t!("_ZN28_$u7b$$u7b$closure$u7d$$u7d$E", "{{closure}}");
+        t!("_ZN15__STATIC_FMTSTRE", "__STATIC_FMTSTR");
+    }
+
+    #[test]
+    fn demangle_trait_impls() {
+        t!(
+            "_ZN71_$LT$Test$u20$$u2b$$u20$$u27$static$u20$as$u20$foo..Bar$LT$Test$GT$$GT$3barE",
+            "<Test + 'static as foo::Bar<Test>>::bar"
+        );
+    }
+
+    #[test]
+    fn demangle_without_hash() {
+        let s = "_ZN3foo17h05af221e174051e9E";
+        t!(s, "foo::h05af221e174051e9");
+        t_nohash!(s, "foo");
+    }
+
+    #[test]
+    fn demangle_without_hash_edgecases() {
+        // One element, no hash.
+        t_nohash!("_ZN3fooE", "foo");
+        // Two elements, no hash.
+        t_nohash!("_ZN3foo3barE", "foo::bar");
+        // Longer-than-normal hash.
+        t_nohash!("_ZN3foo20h05af221e174051e9abcE", "foo");
+        // Shorter-than-normal hash.
+        t_nohash!("_ZN3foo5h05afE", "foo");
+        // Valid hash, but not at the end.
+        t_nohash!("_ZN17h05af221e174051e93fooE", "h05af221e174051e9::foo");
+        // Not a valid hash, missing the 'h'.
+        t_nohash!("_ZN3foo16ffaf221e174051e9E", "foo::ffaf221e174051e9");
+        // Not a valid hash, has a non-hex-digit.
+        t_nohash!("_ZN3foo17hg5af221e174051e9E", "foo::hg5af221e174051e9");
+    }
+
+    #[test]
+    fn demangle_thinlto() {
+        // One element, no hash.
+        t!("_ZN3fooE.llvm.9D1C9369", "foo");
+        t!("_ZN3fooE.llvm.9D1C9369@@16", "foo");
+        t_nohash!(
+            "_ZN9backtrace3foo17hbb467fcdaea5d79bE.llvm.A5310EB9",
+            "backtrace::foo"
+        );
+    }
+
+    #[test]
+    fn demangle_llvm_ir_branch_labels() {
+        t!("_ZN4core5slice77_$LT$impl$u20$core..ops..index..IndexMut$LT$I$GT$$u20$for$u20$$u5b$T$u5d$$GT$9index_mut17haf9727c2edfbc47bE.exit.i.i", "core::slice::<impl core::ops::index::IndexMut<I> for [T]>::index_mut::haf9727c2edfbc47b.exit.i.i");
+        t_nohash!("_ZN4core5slice77_$LT$impl$u20$core..ops..index..IndexMut$LT$I$GT$$u20$for$u20$$u5b$T$u5d$$GT$9index_mut17haf9727c2edfbc47bE.exit.i.i", "core::slice::<impl core::ops::index::IndexMut<I> for [T]>::index_mut.exit.i.i");
+    }
+
+    #[test]
+    fn demangle_ignores_suffix_that_doesnt_look_like_a_symbol() {
+        t_err!("_ZN3fooE.llvm moocow");
+    }
+
+    #[test]
+    fn dont_panic() {
+        super::demangle("_ZN2222222222222222222222EE").to_string();
+        super::demangle("_ZN5*70527e27.ll34csaғE").to_string();
+        super::demangle("_ZN5*70527a54.ll34_$b.1E").to_string();
+        super::demangle(
+            "\
+             _ZN5~saäb4e\n\
+             2734cOsbE\n\
+             5usage20h)3\0\0\0\0\0\0\07e2734cOsbE\
+             ",
+        )
+        .to_string();
+    }
+
+    #[test]
+    fn invalid_no_chop() {
+        t_err!("_ZNfooE");
+    }
+
+    #[test]
+    fn handle_assoc_types() {
+        t!("_ZN151_$LT$alloc..boxed..Box$LT$alloc..boxed..FnBox$LT$A$C$$u20$Output$u3d$R$GT$$u20$$u2b$$u20$$u27$a$GT$$u20$as$u20$core..ops..function..FnOnce$LT$A$GT$$GT$9call_once17h69e8f44b3723e1caE", "<alloc::boxed::Box<alloc::boxed::FnBox<A, Output=R> + 'a> as core::ops::function::FnOnce<A>>::call_once::h69e8f44b3723e1ca");
+    }
+
+    #[test]
+    fn handle_bang() {
+        t!(
+            "_ZN88_$LT$core..result..Result$LT$$u21$$C$$u20$E$GT$$u20$as$u20$std..process..Termination$GT$6report17hfc41d0da4a40b3e8E",
+            "<core::result::Result<!, E> as std::process::Termination>::report::hfc41d0da4a40b3e8"
+        );
+    }
+
+    #[test]
+    fn limit_recursion() {
+        use std::fmt::Write;
+        let mut s = String::new();
+        assert!(write!(s, "{}", super::demangle("_RNvB_1a")).is_err());
+    }
+
+    #[test]
+    fn limit_output() {
+        use std::fmt::Write;
+        let mut s = String::new();
+        assert!(write!(
+            s,
+            "{}",
+            super::demangle("RYFG_FGyyEvRYFF_EvRYFFEvERLB_B_B_ERLRjB_B_B_")
+        )
+        .is_err());
+    }
+}
diff --git a/src/v0.rs b/src/v0.rs
new file mode 100644
index 0000000..163686b
--- /dev/null
+++ b/src/v0.rs
@@ -0,0 +1,1811 @@
+use core::char;
+use core::fmt;
+use core::fmt::{Display, Write};
+
+// Maximum recursion depth when parsing symbols before we just bail out saying
+// "this symbol is invalid"
+const MAX_DEPTH: u32 = 500;
+
+// Approximately the maximum size of the symbol that we'll print. This is
+// approximate because it only limits calls writing to `LimitedFormatter`, but
+// not all writes exclusively go through `LimitedFormatter`. Some writes go
+// directly to the underlying formatter, but when that happens we always write
+// at least a little to the `LimitedFormatter`.
+const MAX_APPROX_SIZE: usize = 1_000_000;
+
+/// Representation of a demangled symbol name.
+pub struct Demangle<'a> {
+    inner: &'a str,
+}
+
+/// De-mangles a Rust symbol into a more readable version
+///
+/// This function will take a **mangled** symbol and return a value. When printed,
+/// the de-mangled version will be written. If the symbol does not look like
+/// a mangled symbol, the original value will be written instead.
+pub fn demangle(s: &str) -> Result<(Demangle, &str), Invalid> {
+    // First validate the symbol. If it doesn't look like anything we're
+    // expecting, we just print it literally. Note that we must handle non-Rust
+    // symbols because we could have any function in the backtrace.
+    let inner;
+    if s.len() > 2 && s.starts_with("_R") {
+        inner = &s[2..];
+    } else if s.len() > 1 && s.starts_with('R') {
+        // On Windows, dbghelp strips leading underscores, so we accept "R..."
+        // form too.
+        inner = &s[1..];
+    } else if s.len() > 3 && s.starts_with("__R") {
+        // On OSX, symbols are prefixed with an extra _
+        inner = &s[3..];
+    } else {
+        return Err(Invalid);
+    }
+
+    // Paths always start with uppercase characters.
+    match inner.as_bytes()[0] {
+        b'A'..=b'Z' => {}
+        _ => return Err(Invalid),
+    }
+
+    // only work with ascii text
+    if inner.bytes().any(|c| c & 0x80 != 0) {
+        return Err(Invalid);
+    }
+
+    // Verify that the symbol is indeed a valid path.
+    let mut parser = Parser {
+        sym: inner,
+        next: 0,
+        depth: 0,
+    };
+    parser.skip_path()?;
+
+    // Instantiating crate (paths always start with uppercase characters).
+    if let Some(&(b'A'..=b'Z')) = parser.sym.as_bytes().get(parser.next) {
+        parser.skip_path()?;
+    }
+
+    Ok((Demangle { inner }, &parser.sym[parser.next..]))
+}
+
+impl<'s> Display for Demangle<'s> {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        let mut remaining = MAX_APPROX_SIZE;
+        let mut printer = Printer {
+            parser: Ok(Parser {
+                sym: self.inner,
+                next: 0,
+                depth: 0,
+            }),
+            out: LimitedFormatter {
+                remaining: &mut remaining,
+                inner: f,
+            },
+            bound_lifetime_depth: 0,
+        };
+        printer.print_path(true)
+    }
+}
+
+#[derive(PartialEq, Eq)]
+pub struct Invalid;
+
+struct Ident<'s> {
+    /// ASCII part of the identifier.
+    ascii: &'s str,
+    /// Punycode insertion codes for Unicode codepoints, if any.
+    punycode: &'s str,
+}
+
+const SMALL_PUNYCODE_LEN: usize = 128;
+
+impl<'s> Ident<'s> {
+    /// Attempt to decode punycode on the stack (allocation-free),
+    /// and pass the char slice to the closure, if successful.
+    /// This supports up to `SMALL_PUNYCODE_LEN` characters.
+    fn try_small_punycode_decode<F: FnOnce(&[char]) -> R, R>(&self, f: F) -> Option<R> {
+        let mut out = ['\0'; SMALL_PUNYCODE_LEN];
+        let mut out_len = 0;
+        let r = self.punycode_decode(|i, c| {
+            // Check there's space left for another character.
+            out.get(out_len).ok_or(())?;
+
+            // Move the characters after the insert position.
+            let mut j = out_len;
+            out_len += 1;
+
+            while j > i {
+                out[j] = out[j - 1];
+                j -= 1;
+            }
+
+            // Insert the new character.
+            out[i] = c;
+
+            Ok(())
+        });
+        if r.is_ok() {
+            Some(f(&out[..out_len]))
+        } else {
+            None
+        }
+    }
+
+    /// Decode punycode as insertion positions and characters
+    /// and pass them to the closure, which can return `Err(())`
+    /// to stop the decoding process.
+    fn punycode_decode<F: FnMut(usize, char) -> Result<(), ()>>(
+        &self,
+        mut insert: F,
+    ) -> Result<(), ()> {
+        let mut punycode_bytes = self.punycode.bytes().peekable();
+        if punycode_bytes.peek().is_none() {
+            return Err(());
+        }
+
+        let mut len = 0;
+
+        // Populate initial output from ASCII fragment.
+        for c in self.ascii.chars() {
+            insert(len, c)?;
+            len += 1;
+        }
+
+        // Punycode parameters and initial state.
+        let base = 36;
+        let t_min = 1;
+        let t_max = 26;
+        let skew = 38;
+        let mut damp = 700;
+        let mut bias = 72;
+        let mut i: usize = 0;
+        let mut n: usize = 0x80;
+
+        loop {
+            // Read one delta value.
+            let mut delta: usize = 0;
+            let mut w = 1;
+            let mut k: usize = 0;
+            loop {
+                use core::cmp::{max, min};
+
+                k += base;
+                let t = min(max(k.saturating_sub(bias), t_min), t_max);
+
+                let d = match punycode_bytes.next() {
+                    Some(d @ b'a'..=b'z') => d - b'a',
+                    Some(d @ b'0'..=b'9') => 26 + (d - b'0'),
+                    _ => return Err(()),
+                };
+                let d = d as usize;
+                delta = delta.checked_add(d.checked_mul(w).ok_or(())?).ok_or(())?;
+                if d < t {
+                    break;
+                }
+                w = w.checked_mul(base - t).ok_or(())?;
+            }
+
+            // Compute the new insert position and character.
+            len += 1;
+            i = i.checked_add(delta).ok_or(())?;
+            n = n.checked_add(i / len).ok_or(())?;
+            i %= len;
+
+            let n_u32 = n as u32;
+            let c = if n_u32 as usize == n {
+                char::from_u32(n_u32).ok_or(())?
+            } else {
+                return Err(());
+            };
+
+            // Insert the new character and increment the insert position.
+            insert(i, c)?;
+            i += 1;
+
+            // If there are no more deltas, decoding is complete.
+            if punycode_bytes.peek().is_none() {
+                return Ok(());
+            }
+
+            // Perform bias adaptation.
+            delta /= damp;
+            damp = 2;
+
+            delta += delta / len;
+            let mut k = 0;
+            while delta > ((base - t_min) * t_max) / 2 {
+                delta /= base - t_min;
+                k += base;
+            }
+            bias = k + ((base - t_min + 1) * delta) / (delta + skew);
+        }
+    }
+}
+
+impl<'s> Display for Ident<'s> {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        self.try_small_punycode_decode(|chars| {
+            for &c in chars {
+                c.fmt(f)?;
+            }
+            Ok(())
+        })
+        .unwrap_or_else(|| {
+            if !self.punycode.is_empty() {
+                f.write_str("punycode{")?;
+
+                // Reconstruct a standard Punycode encoding,
+                // by using `-` as the separator.
+                if !self.ascii.is_empty() {
+                    f.write_str(self.ascii)?;
+                    f.write_str("-")?;
+                }
+                f.write_str(self.punycode)?;
+
+                f.write_str("}")
+            } else {
+                f.write_str(self.ascii)
+            }
+        })
+    }
+}
+
+fn basic_type(tag: u8) -> Option<&'static str> {
+    Some(match tag {
+        b'b' => "bool",
+        b'c' => "char",
+        b'e' => "str",
+        b'u' => "()",
+        b'a' => "i8",
+        b's' => "i16",
+        b'l' => "i32",
+        b'x' => "i64",
+        b'n' => "i128",
+        b'i' => "isize",
+        b'h' => "u8",
+        b't' => "u16",
+        b'm' => "u32",
+        b'y' => "u64",
+        b'o' => "u128",
+        b'j' => "usize",
+        b'f' => "f32",
+        b'd' => "f64",
+        b'z' => "!",
+        b'p' => "_",
+        b'v' => "...",
+
+        _ => return None,
+    })
+}
+
+struct Parser<'s> {
+    sym: &'s str,
+    next: usize,
+    depth: u32,
+}
+
+impl<'s> Parser<'s> {
+    fn push_depth(&mut self) -> Result<(), Invalid> {
+        self.depth += 1;
+        if self.depth > MAX_DEPTH {
+            Err(Invalid)
+        } else {
+            Ok(())
+        }
+    }
+
+    fn pop_depth(&mut self) {
+        self.depth -= 1;
+    }
+
+    fn peek(&self) -> Option<u8> {
+        self.sym.as_bytes().get(self.next).cloned()
+    }
+
+    fn eat(&mut self, b: u8) -> bool {
+        if self.peek() == Some(b) {
+            self.next += 1;
+            true
+        } else {
+            false
+        }
+    }
+
+    fn next(&mut self) -> Result<u8, Invalid> {
+        let b = self.peek().ok_or(Invalid)?;
+        self.next += 1;
+        Ok(b)
+    }
+
+    fn hex_nibbles(&mut self) -> Result<&'s str, Invalid> {
+        let start = self.next;
+        loop {
+            match self.next()? {
+                b'0'..=b'9' | b'a'..=b'f' => {}
+                b'_' => break,
+                _ => return Err(Invalid),
+            }
+        }
+        Ok(&self.sym[start..self.next - 1])
+    }
+
+    fn digit_10(&mut self) -> Result<u8, Invalid> {
+        let d = match self.peek() {
+            Some(d @ b'0'..=b'9') => d - b'0',
+            _ => return Err(Invalid),
+        };
+        self.next += 1;
+        Ok(d)
+    }
+
+    fn digit_62(&mut self) -> Result<u8, Invalid> {
+        let d = match self.peek() {
+            Some(d @ b'0'..=b'9') => d - b'0',
+            Some(d @ b'a'..=b'z') => 10 + (d - b'a'),
+            Some(d @ b'A'..=b'Z') => 10 + 26 + (d - b'A'),
+            _ => return Err(Invalid),
+        };
+        self.next += 1;
+        Ok(d)
+    }
+
+    fn integer_62(&mut self) -> Result<u64, Invalid> {
+        if self.eat(b'_') {
+            return Ok(0);
+        }
+
+        let mut x: u64 = 0;
+        while !self.eat(b'_') {
+            let d = self.digit_62()? as u64;
+            x = x.checked_mul(62).ok_or(Invalid)?;
+            x = x.checked_add(d).ok_or(Invalid)?;
+        }
+        x.checked_add(1).ok_or(Invalid)
+    }
+
+    fn opt_integer_62(&mut self, tag: u8) -> Result<u64, Invalid> {
+        if !self.eat(tag) {
+            return Ok(0);
+        }
+        self.integer_62()?.checked_add(1).ok_or(Invalid)
+    }
+
+    fn disambiguator(&mut self) -> Result<u64, Invalid> {
+        self.opt_integer_62(b's')
+    }
+
+    fn namespace(&mut self) -> Result<Option<char>, Invalid> {
+        match self.next()? {
+            // Special namespaces, like closures and shims.
+            ns @ b'A'..=b'Z' => Ok(Some(ns as char)),
+
+            // Implementation-specific/unspecified namespaces.
+            b'a'..=b'z' => Ok(None),
+
+            _ => Err(Invalid),
+        }
+    }
+
+    fn backref(&mut self) -> Result<Parser<'s>, Invalid> {
+        let s_start = self.next - 1;
+        let i = self.integer_62()?;
+        if i >= s_start as u64 {
+            return Err(Invalid);
+        }
+        let mut new_parser = Parser {
+            sym: self.sym,
+            next: i as usize,
+            depth: self.depth,
+        };
+        new_parser.push_depth()?;
+        Ok(new_parser)
+    }
+
+    fn ident(&mut self) -> Result<Ident<'s>, Invalid> {
+        let is_punycode = self.eat(b'u');
+        let mut len = self.digit_10()? as usize;
+        if len != 0 {
+            while let Ok(d) = self.digit_10() {
+                len = len.checked_mul(10).ok_or(Invalid)?;
+                len = len.checked_add(d as usize).ok_or(Invalid)?;
+            }
+        }
+
+        // Skip past the optional `_` separator.
+        self.eat(b'_');
+
+        let start = self.next;
+        self.next = self.next.checked_add(len).ok_or(Invalid)?;
+        if self.next > self.sym.len() {
+            return Err(Invalid);
+        }
+
+        let ident = &self.sym[start..self.next];
+
+        if is_punycode {
+            let ident = match ident.bytes().rposition(|b| b == b'_') {
+                Some(i) => Ident {
+                    ascii: &ident[..i],
+                    punycode: &ident[i + 1..],
+                },
+                None => Ident {
+                    ascii: "",
+                    punycode: ident,
+                },
+            };
+            if ident.punycode.is_empty() {
+                return Err(Invalid);
+            }
+            Ok(ident)
+        } else {
+            Ok(Ident {
+                ascii: ident,
+                punycode: "",
+            })
+        }
+    }
+
+    fn skip_path(&mut self) -> Result<(), Invalid> {
+        self.push_depth()?;
+
+        match self.next()? {
+            b'C' => {
+                self.disambiguator()?;
+                self.ident()?;
+            }
+            b'N' => {
+                self.namespace()?;
+                self.skip_path()?;
+                self.disambiguator()?;
+                self.ident()?;
+            }
+            b'M' => {
+                self.disambiguator()?;
+                self.skip_path()?;
+                self.skip_type()?;
+            }
+            b'X' => {
+                self.disambiguator()?;
+                self.skip_path()?;
+                self.skip_type()?;
+                self.skip_path()?;
+            }
+            b'Y' => {
+                self.skip_type()?;
+                self.skip_path()?;
+            }
+            b'I' => {
+                self.skip_path()?;
+                while !self.eat(b'E') {
+                    self.skip_generic_arg()?;
+                }
+            }
+            b'B' => {
+                self.backref()?;
+            }
+            _ => return Err(Invalid),
+        }
+        Ok(())
+    }
+
+    fn skip_generic_arg(&mut self) -> Result<(), Invalid> {
+        self.push_depth()?;
+
+        if self.eat(b'L') {
+            self.integer_62()?;
+            Ok(())
+        } else if self.eat(b'K') {
+            self.skip_const()
+        } else {
+            self.skip_type()
+        }
+    }
+
+    fn skip_type(&mut self) -> Result<(), Invalid> {
+        self.push_depth()?;
+
+        match self.next()? {
+            tag if basic_type(tag).is_some() => {}
+
+            b'R' | b'Q' => {
+                if self.eat(b'L') {
+                    self.integer_62()?;
+                }
+                self.skip_type()?;
+            }
+            b'P' | b'O' | b'S' => self.skip_type()?,
+            b'A' => {
+                self.skip_type()?;
+                self.skip_const()?;
+            }
+            b'T' => {
+                while !self.eat(b'E') {
+                    self.skip_type()?;
+                }
+            }
+            b'F' => {
+                let _binder = self.opt_integer_62(b'G')?;
+                let _is_unsafe = self.eat(b'U');
+                if self.eat(b'K') {
+                    let c_abi = self.eat(b'C');
+                    if !c_abi {
+                        let abi = self.ident()?;
+                        if abi.ascii.is_empty() || !abi.punycode.is_empty() {
+                            return Err(Invalid);
+                        }
+                    }
+                }
+                while !self.eat(b'E') {
+                    self.skip_type()?;
+                }
+                self.skip_type()?;
+            }
+            b'D' => {
+                let _binder = self.opt_integer_62(b'G')?;
+                while !self.eat(b'E') {
+                    self.skip_path()?;
+                    while self.eat(b'p') {
+                        self.ident()?;
+                        self.skip_type()?;
+                    }
+                }
+                if !self.eat(b'L') {
+                    return Err(Invalid);
+                }
+                self.integer_62()?;
+            }
+            b'B' => {
+                self.backref()?;
+            }
+            _ => {
+                // Go back to the tag, so `skip_path` also sees it.
+                self.next -= 1;
+                self.skip_path()?;
+            }
+        }
+        Ok(())
+    }
+
+    fn skip_const(&mut self) -> Result<(), Invalid> {
+        self.push_depth()?;
+
+        if self.eat(b'B') {
+            self.backref()?;
+            return Ok(());
+        }
+
+        let ty_tag = self.next()?;
+
+        if ty_tag == b'p' {
+            // We don't encode the type if the value is a placeholder.
+            return Ok(());
+        }
+
+        match ty_tag {
+            // Unsigned integer types.
+            b'h' | b't' | b'm' | b'y' | b'o' | b'j' |
+            // Bool.
+            b'b' |
+            // Char.
+            b'c' => {}
+
+            // Signed integer types.
+            b'a' | b's' | b'l' | b'x' | b'n' | b'i' => {
+                // Negation on signed integers.
+                let _ = self.eat(b'n');
+            }
+
+            _ => return Err(Invalid),
+        }
+
+        self.hex_nibbles()?;
+        Ok(())
+    }
+}
+
+struct Printer<'a, 'b: 'a, 's> {
+    parser: Result<Parser<'s>, Invalid>,
+    out: LimitedFormatter<'a, 'b>,
+    bound_lifetime_depth: u32,
+}
+
+/// Mark the parser as errored, print `?` and return early.
+/// This allows callers to keep printing the approximate
+/// syntax of the path/type/const, despite having errors.
+/// E.g. `Vec<[(A, ?); ?]>` instead of `Vec<[(A, ?`.
+macro_rules! invalid {
+    ($printer:ident) => {{
+        $printer.parser = Err(Invalid);
+        return $printer.out.write_str("?");
+    }};
+}
+
+/// Call a parser method (if the parser hasn't errored yet),
+/// and mark the parser as errored if it returns `Err(Invalid)`.
+///
+/// If the parser errored, before or now, prints `?`, and
+/// returns early the current function (see `invalid!` above).
+macro_rules! parse {
+    ($printer:ident, $method:ident $(($($arg:expr),*))*) => {
+        match $printer.parser_mut().and_then(|p| p.$method($($($arg),*)*)) {
+            Ok(x) => x,
+            Err(Invalid) => invalid!($printer),
+        }
+    };
+}
+
+impl<'a, 'b, 's> Printer<'a, 'b, 's> {
+    fn parser_mut<'c>(&'c mut self) -> Result<&'c mut Parser<'s>, Invalid> {
+        self.parser.as_mut().map_err(|_| Invalid)
+    }
+
+    /// Eat the given character from the parser,
+    /// returning `false` if the parser errored.
+    fn eat(&mut self, b: u8) -> bool {
+        self.parser_mut().map(|p| p.eat(b)) == Ok(true)
+    }
+
+    /// Return a nested parser for a backref.
+    fn backref_printer<'c>(&'c mut self) -> Printer<'c, 'b, 's> {
+        Printer {
+            parser: self.parser_mut().and_then(|p| p.backref()),
+            out: LimitedFormatter {
+                remaining: self.out.remaining,
+                inner: self.out.inner,
+            },
+            bound_lifetime_depth: self.bound_lifetime_depth,
+        }
+    }
+
+    fn push_depth(&mut self) -> bool {
+        match self.parser {
+            Err(_) => false,
+            Ok(ref mut parser) => {
+                let _ = parser.push_depth();
+                true
+            }
+        }
+    }
+
+    fn pop_depth(&mut self) {
+        if let Ok(ref mut parser) = self.parser {
+            parser.pop_depth();
+        }
+    }
+
+    /// Print the lifetime according to the previously decoded index.
+    /// An index of `0` always refers to `'_`, but starting with `1`,
+    /// indices refer to late-bound lifetimes introduced by a binder.
+    fn print_lifetime_from_index(&mut self, lt: u64) -> fmt::Result {
+        self.out.write_str("'")?;
+        if lt == 0 {
+            return self.out.write_str("_");
+        }
+        match (self.bound_lifetime_depth as u64).checked_sub(lt) {
+            Some(depth) => {
+                // Try to print lifetimes alphabetically first.
+                if depth < 26 {
+                    let c = (b'a' + depth as u8) as char;
+                    c.fmt(self.out.inner)
+                } else {
+                    // Use `'_123` after running out of letters.
+                    self.out.write_str("_")?;
+                    depth.fmt(self.out.inner)
+                }
+            }
+            None => invalid!(self),
+        }
+    }
+
+    /// Optionally enter a binder ('G') for late-bound lifetimes,
+    /// printing e.g. `for<'a, 'b> ` before calling the closure,
+    /// and make those lifetimes visible to it (via depth level).
+    fn in_binder<F>(&mut self, f: F) -> fmt::Result
+    where
+        F: FnOnce(&mut Self) -> fmt::Result,
+    {
+        let bound_lifetimes = parse!(self, opt_integer_62(b'G'));
+        if bound_lifetimes > 0 {
+            self.out.write_str("for<")?;
+            for i in 0..bound_lifetimes {
+                if i > 0 {
+                    self.out.write_str(", ")?;
+                }
+                self.bound_lifetime_depth += 1;
+                self.print_lifetime_from_index(1)?;
+            }
+            self.out.write_str("> ")?;
+        }
+
+        let r = f(self);
+
+        // Restore `bound_lifetime_depth` to the previous value.
+        self.bound_lifetime_depth -= bound_lifetimes as u32;
+
+        r
+    }
+
+    /// Print list elements using the given closure and separator,
+    /// until the end of the list ('E') is found, or the parser errors.
+    /// Returns the number of elements printed.
+    fn print_sep_list<F>(&mut self, f: F, sep: &str) -> Result<usize, fmt::Error>
+    where
+        F: Fn(&mut Self) -> fmt::Result,
+    {
+        let mut i = 0;
+        while self.parser.is_ok() && !self.eat(b'E') {
+            if i > 0 {
+                self.out.write_str(sep)?;
+            }
+            f(self)?;
+            i += 1;
+        }
+        Ok(i)
+    }
+
+    fn print_path(&mut self, in_value: bool) -> fmt::Result {
+        let tag = parse!(self, next);
+        match tag {
+            b'C' => {
+                let dis = parse!(self, disambiguator);
+                let name = parse!(self, ident);
+
+                name.fmt(self.out.inner)?;
+                if !self.out.inner.alternate() {
+                    self.out.write_str("[")?;
+                    fmt::LowerHex::fmt(&dis, self.out.inner)?;
+                    self.out.write_str("]")?;
+                }
+            }
+            b'N' => {
+                let ns = parse!(self, namespace);
+
+                self.print_path(in_value)?;
+
+                let dis = parse!(self, disambiguator);
+                let name = parse!(self, ident);
+
+                match ns {
+                    // Special namespaces, like closures and shims.
+                    Some(ns) => {
+                        self.out.write_str("::{")?;
+                        match ns {
+                            'C' => self.out.write_str("closure")?,
+                            'S' => self.out.write_str("shim")?,
+                            _ => ns.fmt(self.out.inner)?,
+                        }
+                        if !name.ascii.is_empty() || !name.punycode.is_empty() {
+                            self.out.write_str(":")?;
+                            name.fmt(self.out.inner)?;
+                        }
+                        self.out.write_str("#")?;
+                        dis.fmt(self.out.inner)?;
+                        self.out.write_str("}")?;
+                    }
+
+                    // Implementation-specific/unspecified namespaces.
+                    None => {
+                        if !name.ascii.is_empty() || !name.punycode.is_empty() {
+                            self.out.write_str("::")?;
+                            name.fmt(self.out.inner)?;
+                        }
+                    }
+                }
+            }
+            b'M' | b'X' | b'Y' => {
+                if tag != b'Y' {
+                    // Ignore the `impl`'s own path.
+                    parse!(self, disambiguator);
+                    parse!(self, skip_path);
+                }
+
+                self.out.write_str("<")?;
+                self.print_type()?;
+                if tag != b'M' {
+                    self.out.write_str(" as ")?;
+                    self.print_path(false)?;
+                }
+                self.out.write_str(">")?;
+            }
+            b'I' => {
+                self.print_path(in_value)?;
+                if in_value {
+                    self.out.write_str("::")?;
+                }
+                self.out.write_str("<")?;
+                self.print_sep_list(Self::print_generic_arg, ", ")?;
+                self.out.write_str(">")?;
+            }
+            b'B' => {
+                let mut backref_printer = self.backref_printer();
+                backref_printer.print_path(in_value)?;
+                if backref_printer.parser.is_err() {
+                    return Err(fmt::Error);
+                }
+            }
+            _ => invalid!(self),
+        }
+        Ok(())
+    }
+
+    fn print_generic_arg(&mut self) -> fmt::Result {
+        if self.eat(b'L') {
+            let lt = parse!(self, integer_62);
+            self.print_lifetime_from_index(lt)
+        } else if self.eat(b'K') {
+            self.print_const()
+        } else {
+            self.print_type()
+        }
+    }
+
+    fn print_type(&mut self) -> fmt::Result {
+        let tag = parse!(self, next);
+
+        if let Some(ty) = basic_type(tag) {
+            return self.out.write_str(ty);
+        }
+
+        self.push_depth();
+
+        match tag {
+            b'R' | b'Q' => {
+                self.out.write_str("&")?;
+                if self.eat(b'L') {
+                    let lt = parse!(self, integer_62);
+                    if lt != 0 {
+                        self.print_lifetime_from_index(lt)?;
+                        self.out.write_str(" ")?;
+                    }
+                }
+                if tag != b'R' {
+                    self.out.write_str("mut ")?;
+                }
+                self.print_type()?;
+            }
+
+            b'P' | b'O' => {
+                self.out.write_str("*")?;
+                if tag != b'P' {
+                    self.out.write_str("mut ")?;
+                } else {
+                    self.out.write_str("const ")?;
+                }
+                self.print_type()?;
+            }
+
+            b'A' | b'S' => {
+                self.out.write_str("[")?;
+                self.print_type()?;
+                if tag == b'A' {
+                    self.out.write_str("; ")?;
+                    self.print_const()?;
+                }
+                self.out.write_str("]")?;
+            }
+            b'T' => {
+                self.out.write_str("(")?;
+                let count = self.print_sep_list(Self::print_type, ", ")?;
+                if count == 1 {
+                    self.out.write_str(",")?;
+                }
+                self.out.write_str(")")?;
+            }
+            b'F' => self.in_binder(|this| {
+                let is_unsafe = this.eat(b'U');
+                let abi = if this.eat(b'K') {
+                    if this.eat(b'C') {
+                        Some("C")
+                    } else {
+                        let abi = parse!(this, ident);
+                        if abi.ascii.is_empty() || !abi.punycode.is_empty() {
+                            invalid!(this);
+                        }
+                        Some(abi.ascii)
+                    }
+                } else {
+                    None
+                };
+
+                if is_unsafe {
+                    this.out.write_str("unsafe ")?;
+                }
+
+                if let Some(abi) = abi {
+                    this.out.write_str("extern \"")?;
+
+                    // If the ABI had any `-`, they were replaced with `_`,
+                    // so the parts between `_` have to be re-joined with `-`.
+                    let mut parts = abi.split('_');
+                    this.out.write_str(parts.next().unwrap())?;
+                    for part in parts {
+                        this.out.write_str("-")?;
+                        this.out.write_str(part)?;
+                    }
+
+                    this.out.write_str("\" ")?;
+                }
+
+                this.out.write_str("fn(")?;
+                this.print_sep_list(Self::print_type, ", ")?;
+                this.out.write_str(")")?;
+
+                if this.eat(b'u') {
+                    // Skip printing the return type if it's 'u', i.e. `()`.
+                } else {
+                    this.out.write_str(" -> ")?;
+                    this.print_type()?;
+                }
+
+                Ok(())
+            })?,
+            b'D' => {
+                self.out.write_str("dyn ")?;
+                self.in_binder(|this| {
+                    this.print_sep_list(Self::print_dyn_trait, " + ")?;
+                    Ok(())
+                })?;
+
+                if !self.eat(b'L') {
+                    invalid!(self);
+                }
+                let lt = parse!(self, integer_62);
+                if lt != 0 {
+                    self.out.write_str(" + ")?;
+                    self.print_lifetime_from_index(lt)?;
+                }
+            }
+            b'B' => {
+                self.backref_printer().print_type()?;
+            }
+            _ => {
+                // Go back to the tag, so `print_path` also sees it.
+                let _ = self.parser_mut().map(|p| p.next -= 1);
+                self.print_path(false)?;
+            }
+        }
+
+        self.pop_depth();
+        Ok(())
+    }
+
+    /// A trait in a trait object may have some "existential projections"
+    /// (i.e. associated type bindings) after it, which should be printed
+    /// in the `<...>` of the trait, e.g. `dyn Trait<T, U, Assoc=X>`.
+    /// To this end, this method will keep the `<...>` of an 'I' path
+    /// open, by omitting the `>`, and return `Ok(true)` in that case.
+    fn print_path_maybe_open_generics(&mut self) -> Result<bool, fmt::Error> {
+        if self.eat(b'B') {
+            self.backref_printer().print_path_maybe_open_generics()
+        } else if self.eat(b'I') {
+            self.print_path(false)?;
+            self.out.write_str("<")?;
+            self.print_sep_list(Self::print_generic_arg, ", ")?;
+            Ok(true)
+        } else {
+            self.print_path(false)?;
+            Ok(false)
+        }
+    }
+
+    fn print_dyn_trait(&mut self) -> fmt::Result {
+        let mut open = self.print_path_maybe_open_generics()?;
+
+        while self.eat(b'p') {
+            if !open {
+                self.out.write_str("<")?;
+                open = true;
+            } else {
+                self.out.write_str(", ")?;
+            }
+
+            let name = parse!(self, ident);
+            name.fmt(self.out.inner)?;
+            self.out.write_str(" = ")?;
+            self.print_type()?;
+        }
+
+        if open {
+            self.out.write_str(">")?;
+        }
+
+        Ok(())
+    }
+
+    fn print_const(&mut self) -> fmt::Result {
+        if self.eat(b'B') {
+            return self.backref_printer().print_const();
+        }
+
+        let ty_tag = parse!(self, next);
+
+        if ty_tag == b'p' {
+            // We don't encode the type if the value is a placeholder.
+            self.out.write_str("_")?;
+            return Ok(());
+        }
+
+        match ty_tag {
+            // Unsigned integer types.
+            b'h' | b't' | b'm' | b'y' | b'o' | b'j' => self.print_const_uint()?,
+            // Signed integer types.
+            b'a' | b's' | b'l' | b'x' | b'n' | b'i' => self.print_const_int()?,
+            // Bool.
+            b'b' => self.print_const_bool()?,
+            // Char.
+            b'c' => self.print_const_char()?,
+
+            // This branch ought to be unreachable.
+            _ => invalid!(self),
+        };
+
+        if !self.out.inner.alternate() {
+            self.out.write_str(": ")?;
+            let ty = basic_type(ty_tag).unwrap();
+            self.out.write_str(ty)?;
+        }
+
+        Ok(())
+    }
+
+    fn print_const_uint(&mut self) -> fmt::Result {
+        let hex = parse!(self, hex_nibbles);
+
+        // Print anything that doesn't fit in `u64` verbatim.
+        if hex.len() > 16 {
+            self.out.write_str("0x")?;
+            return self.out.write_str(hex);
+        }
+
+        let mut v = 0;
+        for c in hex.chars() {
+            v = (v << 4) | (c.to_digit(16).unwrap() as u64);
+        }
+        v.fmt(self.out.inner)
+    }
+
+    fn print_const_int(&mut self) -> fmt::Result {
+        if self.eat(b'n') {
+            self.out.write_str("-")?;
+        }
+
+        self.print_const_uint()
+    }
+
+    fn print_const_bool(&mut self) -> fmt::Result {
+        match parse!(self, hex_nibbles).as_bytes() {
+            b"0" => self.out.write_str("false"),
+            b"1" => self.out.write_str("true"),
+            _ => invalid!(self),
+        }
+    }
+
+    fn print_const_char(&mut self) -> fmt::Result {
+        let hex = parse!(self, hex_nibbles);
+
+        // Valid `char`s fit in `u32`.
+        if hex.len() > 8 {
+            invalid!(self);
+        }
+
+        let mut v = 0;
+        for c in hex.chars() {
+            v = (v << 4) | (c.to_digit(16).unwrap() as u32);
+        }
+        if let Some(c) = char::from_u32(v) {
+            write!(self.out, "{:?}", c)
+        } else {
+            invalid!(self)
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    macro_rules! t_nohash {
+        ($a:expr, $b:expr) => {{
+            assert_eq!(format!("{:#}", ::demangle($a)), $b);
+        }};
+    }
+    macro_rules! t_nohash_type {
+        ($a:expr, $b:expr) => {
+            t_nohash!(concat!("_RMC0", $a), concat!("<", $b, ">"))
+        };
+    }
+
+    #[test]
+    fn demangle_crate_with_leading_digit() {
+        t_nohash!("_RNvC6_123foo3bar", "123foo::bar");
+    }
+
+    #[test]
+    fn demangle_utf8_idents() {
+        t_nohash!(
+            "_RNqCs4fqI2P2rA04_11utf8_identsu30____7hkackfecea1cbdathfdh9hlq6y",
+            "utf8_idents::საჭმელად_გემრიელი_სადილი"
+        );
+    }
+
+    #[test]
+    fn demangle_closure() {
+        t_nohash!(
+            "_RNCNCNgCs6DXkGYLi8lr_2cc5spawn00B5_",
+            "cc::spawn::{closure#0}::{closure#0}"
+        );
+        t_nohash!(
+            "_RNCINkXs25_NgCsbmNqQUJIY6D_4core5sliceINyB9_4IterhENuNgNoBb_4iter8iterator8Iterator9rpositionNCNgNpB9_6memchr7memrchrs_0E0Bb_",
+            "<core::slice::Iter<u8> as core::iter::iterator::Iterator>::rposition::<core::slice::memchr::memrchr::{closure#1}>::{closure#0}"
+        );
+    }
+
+    #[test]
+    fn demangle_dyn_trait() {
+        t_nohash!(
+            "_RINbNbCskIICzLVDPPb_5alloc5alloc8box_freeDINbNiB4_5boxed5FnBoxuEp6OutputuEL_ECs1iopQbuBiw2_3std",
+            "alloc::alloc::box_free::<dyn alloc::boxed::FnBox<(), Output = ()>>"
+        );
+    }
+
+    #[test]
+    fn demangle_const_generics() {
+        // NOTE(eddyb) this was hand-written, before rustc had working
+        // const generics support (but the mangling format did include them).
+        t_nohash_type!(
+            "INtC8arrayvec8ArrayVechKj7b_E",
+            "arrayvec::ArrayVec<u8, 123>"
+        );
+        t_nohash!(
+            "_RMCs4fqI2P2rA04_13const_genericINtB0_8UnsignedKhb_E",
+            "<const_generic::Unsigned<11>>"
+        );
+        t_nohash!(
+            "_RMCs4fqI2P2rA04_13const_genericINtB0_6SignedKs98_E",
+            "<const_generic::Signed<152>>"
+        );
+        t_nohash!(
+            "_RMCs4fqI2P2rA04_13const_genericINtB0_6SignedKanb_E",
+            "<const_generic::Signed<-11>>"
+        );
+        t_nohash!(
+            "_RMCs4fqI2P2rA04_13const_genericINtB0_4BoolKb0_E",
+            "<const_generic::Bool<false>>"
+        );
+        t_nohash!(
+            "_RMCs4fqI2P2rA04_13const_genericINtB0_4BoolKb1_E",
+            "<const_generic::Bool<true>>"
+        );
+        t_nohash!(
+            "_RMCs4fqI2P2rA04_13const_genericINtB0_4CharKc76_E",
+            "<const_generic::Char<'v'>>"
+        );
+        t_nohash!(
+            "_RMCs4fqI2P2rA04_13const_genericINtB0_4CharKca_E",
+            "<const_generic::Char<'\\n'>>"
+        );
+        t_nohash!(
+            "_RMCs4fqI2P2rA04_13const_genericINtB0_4CharKc2202_E",
+            "<const_generic::Char<'∂'>>"
+        );
+        t_nohash!(
+            "_RNvNvMCs4fqI2P2rA04_13const_genericINtB4_3FooKpE3foo3FOO",
+            "<const_generic::Foo<_>>::foo::FOO"
+        );
+    }
+
+    #[test]
+    fn demangle_exponential_explosion() {
+        // NOTE(eddyb) because of the prefix added by `t_nohash_type!` is
+        // 3 bytes long, `B2_` refers to the start of the type, not `B_`.
+        // 6 backrefs (`B8_E` through `B3_E`) result in 2^6 = 64 copies of `_`.
+        // Also, because the `p` (`_`) type is after all of the starts of the
+        // backrefs, it can be replaced with any other type, independently.
+        t_nohash_type!(
+            concat!("TTTTTT", "p", "B8_E", "B7_E", "B6_E", "B5_E", "B4_E", "B3_E"),
+            "((((((_, _), (_, _)), ((_, _), (_, _))), (((_, _), (_, _)), ((_, _), (_, _)))), \
+             ((((_, _), (_, _)), ((_, _), (_, _))), (((_, _), (_, _)), ((_, _), (_, _))))), \
+             (((((_, _), (_, _)), ((_, _), (_, _))), (((_, _), (_, _)), ((_, _), (_, _)))), \
+             ((((_, _), (_, _)), ((_, _), (_, _))), (((_, _), (_, _)), ((_, _), (_, _))))))"
+        );
+    }
+
+    #[test]
+    fn demangle_thinlto() {
+        t_nohash!("_RC3foo.llvm.9D1C9369", "foo");
+        t_nohash!("_RC3foo.llvm.9D1C9369@@16", "foo");
+        t_nohash!("_RNvC9backtrace3foo.llvm.A5310EB9", "backtrace::foo");
+    }
+
+    #[test]
+    fn demangle_extra_suffix() {
+        // From alexcrichton/rustc-demangle#27:
+        t_nohash!(
+            "_RNvNtNtNtNtCs92dm3009vxr_4rand4rngs7adapter9reseeding4fork23FORK_HANDLER_REGISTERED.0.0",
+            "rand::rngs::adapter::reseeding::fork::FORK_HANDLER_REGISTERED.0.0"
+        );
+    }
+
+    #[test]
+    fn demangling_limits() {
+        // Stress tests found via fuzzing.
+
+        format!(
+            "{:?}",
+            ::demangle(
+                "RICu4$TTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTOOOOOOOOOOOOOOOOOO\
+OOOOOOOOOOOOOOOTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTOOOOOOOOOOOOOOOOOOOOOOOTTTTTTTTTTTTTTTTTTTTTT\
+TTTTTTTTTTTTTTTOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO\
+OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOTTTOOOOOOOOOOOOOOOOOTTTTTTTTTTTTTTTTTTTTTTTTTTTTTT\
+TTTTTTTTOOOOOOOOOOOOOOOOOOOOOOOTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO\
+OOOOOOOOOSOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTO\
+OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO\
+OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOTTTOOOOOOOOOOOOOOOOOTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTOOOOOOOO\
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+OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTOOOOOOOOOOOOOOOOOOOOOO\
+OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO\
+OOOOOOOOOOOTTTOOOOOOOOOOOOOOOOOTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTOOOOOOOOOOOOOOOOOOOOOOOTTTTTT\
+TTTTTTTOOOOOOOOOOOOOOOOOOOOOOOTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO\
+OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTOO\
+OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO\
+OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOTTTOOOOOOOOOOOOOOOOOTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTOOOOOOOOO\
+OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOTTTTTTTTTTTTTTTTTT\
+TTTTTTTTTTTTTTTTTTTOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO\
+OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOTTTOOOOOOOOOOOOOOOOOTTTTTTTTTTTTTTTTTTTTTTTTTT\
+TTTTTTTTTTTTOOOOOOOOOOOOOOOOOOOOOOOTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTOOOOOOOOOOOOOOOOOOOOOOOOOO\
+OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOTTTTTxxxxxR\
+ICu5\u{002c}\u{002d}xOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOTTTTTTTTTTTTTTTTTTTTTT\
+TTTTTTTTTTTTTTTTOOOOOOOOOOOOOOOOOOOOOOOTTTTTTTTTTTTTTTTTTTTTTTTTOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO\
+OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOTTTOOOOOOOOOOOOOOOOOTTTTT\
+TTTTTTTTTTTTTTTTTTTTTTTTTTOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO\
+OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTOOOOOOOOOOOOOOOOOOO\
+OOOOTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO\
+OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOTTTOOOOOOOOOOOOOOOOOTTTT\
+TTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTOOOOOOOOOOOOOOOOOOOOOOOTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTOOOO\
+OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOTTTTTTTTTTTT\
+TTTTTTTTTTTTTTTOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOTTTTTxxxxxRICu3\u{0005}\u{002c}\u{002d}xOOOOOO\
+OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOTTTTTTTTTTTTTTTTOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO\
+OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOTTTOOOOOOOOOOOOOOOOOTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTO\
+OOOOOOOOOOOOOOOOOOOOOOTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO\
+OOOOxxxRICu4\u{002c}\u{002d}xxxxffff\u{0001}\u{0012}ffffffffffffffffffffffffffffffffffffffffffffff\
+ffffffffffxxxxxxxxxxxxxxxxxxxRaRBRaR\u{003e}R\u{003e}xxxu2IC\u{002c}\u{002d}xxxxxxRIC4xxxOOOOOOOOO\
+OOTTTOOOOOOOOOOOOOOOOOTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTOOOOOOOOOOOOOOOOOOOOOOOTTTTTTTTTTTTTTT\
+TTTTTTTTTTTTTTTTTTTTTTOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO\
+OOOOOOOOOOOOOOTTTTTTTTTTTTTTTTTTTTTTTTTTTOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOTTTTTxxxxxRICu4\
+\u{0005}\u{002c}\u{002d}xOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOTTTTTTTTTTTTTTTTOO\
+OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOTTTOOOOOOOOOOOOOOOOOTTTTTTTT\
+TTTTTTTTTTTTTTTTTTTTTTTTTTTTTTOOOOOOOOOOOOOOOOOOOOOOOTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTOOOOOOOO\
+OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOxxxRICu4\u{002c}\u{002d}xxxxffff\u{0001}\u{0012}fffffffffffffff\
+fffffffffffffffffffffffffffffffffffffffffxxxxxxxxxxxxxxxxxxxRaRBRaR\u{003e}R\u{003e}xxxu2IC\
+\u{002c}\u{002d}xxxxxxRIC4xxx\u{0001}\u{0000}K\u{0000}\u{0000}xRBRaR\u{003e}RICu6$\u{002d}RBKIQARI\
+Cu6$\u{002d}RBKIQAA\u{0001}\u{0000}\u{0000}\u{0000}\u{0000}\u{0000}\u{0000}\u{0004}TvvKKKKKKKKKxxx\
+xxxxxxxxxxxxBKIQARICu6$\u{002d}RBKIQAA\u{0001}\u{0000}\u{0000}\u{0000}_\u{0000}xxx"
+            )
+        );
+
+        format!(
+            "{:?}",
+            ::demangle(
+                "RIYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYMYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYRYYYYYYYYYXB_RXB_lYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYRXB_RXYYYYYYYYYYYYYYYYYYYYYXYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYMYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYMYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYyYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYyYY\
+YYYYMYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYyYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYyYYYYYYMYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYyYYYYYYMYYYYYYYRXB_RXYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYMYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYMYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYyYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYRXB_RXYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYyY\
+YYYYYMYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYyYYYYYYMYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYMYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYRYYYYYYYYYXB_RXB_lYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYRXB_RXYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYyYYYYYYMYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYyYYYYYYMYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYRYFhhhhYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYyYYYYYYMYYYYNYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYyYYYYYYMYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYMYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYRYYYYYYYYYXB_RXB_lYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYRXB_RXYYYYYYYYYYYYYYYYYYYYYXYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYMYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYMYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYyYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYyYYYYYYMYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYyYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYyYYYYYYMYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYRYYYYYYYYYXB_R\
+XB_lYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYRXB_RXYYYYYYYYYYYYYYYYYYYYYXYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYMYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYMYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYNYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYMYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYRYYYYYYYYYXB_RXB_lYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYRXB_RXYYYYYYYYYYYYYYYYYYY\
+YYXYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYMYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYMYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYyYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYyYYYYYYMYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYyYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYyYYYYYYMYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYyYYYYYYMYYYYYYYRXB_RXYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYMYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYyYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYRXB_RXY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYyYYYYYYMYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYyYYYYYYMYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYSYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYMYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYRYYYYYYYYYXB_RXB_lYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYRXB_RXYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYyYYYYYYMYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYyYYYYYYMYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYRYFhhhhYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYyYYYYYYMYYYYNYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYyYYYYYYMYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYMYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYRYYYYYYYYYXB_R\
+XB_lYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYRXB_RXYYYYYYYYYYYYYYYYYYYYYXYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYMYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYMYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYyYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYyYYYYYYMYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYyYYYYYYMYYYYYYYRXB_RXYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYMYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYMYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYyYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYRXB_RXYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYyYYYYYYMYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYyYYYYYYMYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+MYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYRYYYYYYYYYXB_RXB_lYYYYYYYYYYYYYYYYYYYYYYYMYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYRYYYYYYYYYXB_RXB_lYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYRXB_RXYYYYYYYYYYYYYYYYYYYYYXYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYMYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYMYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYyYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYRXB_RXYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYIBRIIRIIBRCIByEEj_ByEEj_EEj"
+            )
+        );
+
+        format!(
+            "{:?}",
+            ::demangle(
+                "RYYYYYSSSSSSSSSSSSSSSSSSSSSSSSSSSYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYRRRRRRRRRRRSSSSSSRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRYYYYYYYYYRRRRRRSSSSSSSYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRYYYYYY\
+YYYRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYRCu3YYYYYYY\
+YYYYPYYyYYYbYYYYYYYYYYYYYYRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRR\
+RRRRRRRRRRRRRRRRRRYYYYYYYYYYYYYmYYYYYYYYYYYYYYYYYYYYYRCu3YYYYYYYYYYYPYYYYYYbYYYYYYYYYRYYYYYYYYYYYY\
+YYYYYYSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSYYYYYYYYYYYYRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRR\
+RRRRRRRRRRRRRRRRRRRRRRRRRRRRRRYYYYYYYYYYYYYmYYYYYYYYYYYYYYYYYYYYYRCu3YYYYYYYYYYYPYYYYYYbYYYYYYYYYR\
+YYYYYYYYYYYYYYYYYYSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSYYYYYYYYYYYYRRRRRRRRRRRRYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYRCu3YYYYYYYYYYYPYYyYYYbYYYYYYYYYYYYYYRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRR\
+RRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRYYYYYYYYYYYYYmYYYYYYYYYYYYYYYYYYYYYRCu3YYYYYYYYYYYPYYYYYYbYY\
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+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYyYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY\
+R\u{003b}"
+            )
+        );
+
+        format!(
+            "{:?}",
+            ::demangle(
+                "RIC20tRYIMYNRYFG05_EB5_B_B6_RRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRR\
+RRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRB_E"
+            )
+        );
+    }
+}
+
+struct LimitedFormatter<'a, 'b> {
+    remaining: &'a mut usize,
+    inner: &'a mut fmt::Formatter<'b>,
+}
+
+impl Write for LimitedFormatter<'_, '_> {
+    fn write_str(&mut self, s: &str) -> fmt::Result {
+        match self.remaining.checked_sub(s.len()) {
+            Some(amt) => {
+                *self.remaining = amt;
+                self.inner.write_str(s)
+            }
+            None => Err(fmt::Error),
+        }
+    }
+}