Import syn-mid-0.5.0 am: 8c1c2809f7 am: d3c67dff88 am: 104e53cd6f

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/syn-mid/+/1321939

Change-Id: I4f721a1a533683496efe9b7899e5bfda405e1af2

21 files changed, 1499 insertions, 0 deletions

diff --git a/.cargo_vcs_info.json b/.cargo_vcs_info.json
new file mode 100644
index 0000000..69b0ee6
--- /dev/null
+++ b/.cargo_vcs_info.json
@@ -0,0 +1,5 @@
+{
+  "git": {
+    "sha1": "4cc7697b87772a2eab48efd9dec4e293276dbc20"
+  }
+}
diff --git a/.editorconfig b/.editorconfig
new file mode 100644
index 0000000..2d145b1
--- /dev/null
+++ b/.editorconfig
@@ -0,0 +1,22 @@
+# EditorConfig configuration
+# https://editorconfig.org
+
+# Top-most EditorConfig file
+root = true
+
+# Unix-style newlines with a newline ending every file, utf-8 charset
+[*]
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+charset = utf-8
+
+# Match rust/toml, set 4 space indentation
+[*.{rs,toml}]
+indent_style = space
+indent_size = 4
+
+# Match json/yaml/markdown, set 2 space indentation
+[*.{json,yml,md}]
+indent_style = space
+indent_size = 2
diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000..45bca84
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,4 @@
+[attr]rust text eol=lf whitespace=tab-in-indent,trailing-space,tabwidth=4
+
+* text=auto eol=lf
+*.rs rust
diff --git a/.github/CODEOWNERS b/.github/CODEOWNERS
new file mode 100644
index 0000000..2fdc28f
--- /dev/null
+++ b/.github/CODEOWNERS
@@ -0,0 +1 @@
+* @taiki-e
diff --git a/.github/bors.toml b/.github/bors.toml
new file mode 100644
index 0000000..b44dd8c
--- /dev/null
+++ b/.github/bors.toml
@@ -0,0 +1,10 @@
+status = [
+    "test (1.31.0)",
+    "test (stable)",
+    "test (beta)",
+    "test (nightly)",
+    "style (clippy)",
+    "style (rustfmt)",
+    "style (rustdoc)",
+]
+delete_merged_branches = true
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..c20c9dd
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,95 @@
+name: ci
+
+on:
+  pull_request:
+  push:
+    branches:
+      - master
+      - staging
+      - trying
+  schedule:
+    - cron: '00 01 * * *'
+
+env:
+  RUSTFLAGS: -Dwarnings
+
+jobs:
+  test:
+    name: test
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        rust:
+          # This is the minimum supported Rust version of this crate.
+          # When updating this, the reminder to update the minimum supported
+          # Rust version in README.md.
+          #
+          # Tests are not run as tests may require newer versions of Rust.
+          - 1.31.0
+          - stable
+          - beta
+          - nightly
+    steps:
+      - uses: actions/checkout@master
+      - name: Install Rust
+        shell: bash
+        run: |
+          . ./ci/install-rust.sh ${{ matrix.rust }}
+      - name: Install cargo-hack
+        if: matrix.rust != '1.31.0'
+        run: |
+          cargo install cargo-hack
+      - name: cargo check
+        if: matrix.rust == '1.31.0'
+        run: |
+          cargo check --all-features
+      - name: cargo test
+        if: matrix.rust != '1.31.0'
+        run: |
+          cargo test --all-features
+      - name: cargo hack check --each-feature
+        if: matrix.rust != '1.31.0'
+        run: |
+          cargo hack check --all --each-feature --no-dev-deps
+      # Refs: https://github.com/rust-lang/cargo/issues/5657
+      - name: cargo check -Zminimal-versions
+        if: matrix.rust == 'nightly'
+        run: |
+          cargo update -Zminimal-versions
+          cargo hack check --all --all-features --no-dev-deps --ignore-private
+
+  style:
+    name: style
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        component:
+          - clippy
+          - rustfmt
+          - rustdoc
+    steps:
+      - uses: actions/checkout@master
+      - name: Install Rust
+        shell: bash
+        run: |
+          . ./ci/install-rust.sh
+      - name: Install component
+        if: matrix.component != 'rustdoc'
+        shell: bash
+        run: |
+          . ./ci/install-component.sh ${{ matrix.component }}
+      - name: cargo clippy
+        if: matrix.component == 'clippy'
+        run: |
+          cargo clippy --all --all-features
+      - name: cargo fmt -- --check
+        if: matrix.component == 'rustfmt'
+        run: |
+          cargo fmt --all -- --check
+      - name: cargo doc
+        if: matrix.component == 'rustdoc'
+        env:
+          RUSTDOCFLAGS: -Dwarnings
+        run: |
+          cargo doc --no-deps --all --all-features
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..6a57018
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,7 @@
+target
+**/*.rs.bk
+Cargo.lock
+
+# For platform and editor specific settings, it is recommended to add to
+# a global .gitignore file.
+# Refs: https://help.github.com/en/articles/ignoring-files#create-a-global-gitignore
diff --git a/.rustfmt.toml b/.rustfmt.toml
new file mode 100644
index 0000000..dc49733
--- /dev/null
+++ b/.rustfmt.toml
@@ -0,0 +1,19 @@
+# Rustfmt configuration
+# https://github.com/rust-lang/rustfmt/blob/master/Configurations.md
+
+# This is required for bug-fixes, which technically can't be made to the stable
+# first version.
+version = "Two" # Tracking issue: https://github.com/rust-lang/rustfmt/issues/3383
+
+# Refs: https://internals.rust-lang.org/t/running-rustfmt-on-rust-lang-rust-and-other-rust-lang-repositories/8732/72
+use_small_heuristics = "Max"
+
+# Apply rustfmt to more places.
+merge_imports = true # Tracking issue: https://github.com/rust-lang/rustfmt/issues/3362
+format_code_in_doc_comments = true # Tracking issue: https://github.com/rust-lang/rustfmt/issues/3348
+
+# Set the default settings again to always apply the proper formatting without
+# being affected by the editor settings.
+# Refs: https://github.com/rust-lang/rls/issues/501#issuecomment-333717736
+edition = "2018"
+tab_spaces = 4
diff --git a/CHANGELOG.md b/CHANGELOG.md
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index 0000000..f404310
--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,52 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+This project adheres to [Semantic Versioning](https://semver.org).
+
+## [Unreleased]
+
+## [0.5.0] - 2019-12-09
+
+* [Added `Signature` type.][13]
+
+[13]: https://github.com/taiki-e/syn-mid/pull/13
+
+## [0.4.0] - 2019-08-15
+
+* Updated all data structures based on `syn` 1.0.
+
+* Updated `proc-macro2`, `syn`, and `quote` to 1.0.
+
+* Bumped the minimum required version from Rust 1.30 to Rust 1.31.
+
+## [0.3.0] - 2019-02-18
+
+* Removed support for unneeded syntax.
+
+* Removed unneeded types and fields.
+
+* Implemented `Parse` for `Block`.
+
+* Changed `clone-impls` feature to "disabled by default".
+
+* Removed `extra-traits` feature.
+
+* Bumped the minimum required version from Rust 1.15 to Rust 1.30.
+
+## [0.2.0] - 2019-02-15
+
+* Reduced features.
+
+* Fixed bugs.
+
+## [0.1.0] - 2019-02-14 - YANKED
+
+Initial release
+
+[Unreleased]: https://github.com/taiki-e/syn-mid/compare/v0.5.0...HEAD
+[0.5.0]: https://github.com/taiki-e/syn-mid/compare/v0.4.0...v0.5.0
+[0.4.0]: https://github.com/taiki-e/syn-mid/compare/v0.3.0...v0.4.0
+[0.3.0]: https://github.com/taiki-e/syn-mid/compare/v0.2.0...v0.3.0
+[0.2.0]: https://github.com/taiki-e/syn-mid/compare/v0.1.0...v0.2.0
+[0.1.0]: https://github.com/taiki-e/syn-mid/releases/tag/v0.1.0
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..7191c3e
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,38 @@
+# 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]
+edition = "2018"
+name = "syn-mid"
+version = "0.5.0"
+authors = ["Taiki Endo <te316e89@gmail.com>"]
+description = "Providing the features between \"full\" and \"derive\" of syn.\n"
+homepage = "https://github.com/taiki-e/syn-mid"
+documentation = "https://docs.rs/syn-mid"
+readme = "README.md"
+keywords = ["syn", "macros"]
+categories = ["development-tools::procedural-macro-helpers"]
+license = "Apache-2.0 OR MIT"
+repository = "https://github.com/taiki-e/syn-mid"
+[dependencies.proc-macro2]
+version = "1.0"
+
+[dependencies.quote]
+version = "1.0"
+
+[dependencies.syn]
+version = "1.0.5"
+features = ["parsing", "printing", "derive"]
+default-features = false
+
+[features]
+clone-impls = ["syn/clone-impls"]
diff --git a/Cargo.toml.orig b/Cargo.toml.orig
new file mode 100644
index 0000000..55cd2a6
--- /dev/null
+++ b/Cargo.toml.orig
@@ -0,0 +1,26 @@
+[package]
+name = "syn-mid"
+version = "0.5.0"
+authors = ["Taiki Endo <te316e89@gmail.com>"]
+edition = "2018"
+license = "Apache-2.0 OR MIT"
+repository = "https://github.com/taiki-e/syn-mid"
+homepage = "https://github.com/taiki-e/syn-mid"
+documentation = "https://docs.rs/syn-mid"
+keywords = ["syn", "macros"]
+categories = ["development-tools::procedural-macro-helpers"]
+readme = "README.md"
+description = """
+Providing the features between \"full\" and \"derive\" of syn.
+"""
+
+[workspace]
+members = ["examples/const_fn", "examples/const_fn_test"]
+
+[features]
+clone-impls = ["syn/clone-impls"]
+
+[dependencies]
+proc-macro2 = "1.0"
+quote = "1.0"
+syn = { version = "1.0.5", default-features = false, features = ["parsing", "printing", "derive"] }
diff --git a/LICENSE-APACHE b/LICENSE-APACHE
new file mode 100644
index 0000000..d645695
--- /dev/null
+++ b/LICENSE-APACHE
@@ -0,0 +1,202 @@
+
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diff --git a/LICENSE-MIT b/LICENSE-MIT
new file mode 100644
index 0000000..31aa793
--- /dev/null
+++ b/LICENSE-MIT
@@ -0,0 +1,23 @@
+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
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+
+The above copyright notice and this permission notice
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+of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
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+TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
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diff --git a/README.md b/README.md
new file mode 100644
index 0000000..68c0dbd
--- /dev/null
+++ b/README.md
@@ -0,0 +1,69 @@
+# syn-mid
+
+[![crates-badge]][crates-url]
+[![docs-badge]][docs-url]
+[![license-badge]][license]
+[![rustc-badge]][rustc-url]
+
+[crates-badge]: https://img.shields.io/crates/v/syn-mid.svg
+[crates-url]: https://crates.io/crates/syn-mid
+[docs-badge]: https://docs.rs/syn-mid/badge.svg
+[docs-url]: https://docs.rs/syn-mid
+[license-badge]: https://img.shields.io/crates/l/syn-mid.svg
+[license]: #license
+[rustc-badge]: https://img.shields.io/badge/rustc-1.31+-lightgray.svg
+[rustc-url]: https://blog.rust-lang.org/2018/12/06/Rust-1.31-and-rust-2018.html
+
+Providing the features between "full" and "derive" of syn.
+
+This crate provides the following two unique data structures.
+
+* `syn_mid::ItemFn` -- A function whose body is not parsed.
+
+  ```text
+  fn process(n: usize) -> Result<()> { ... }
+  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ ^     ^
+  ```
+
+* `syn_mid::Block` -- A block whose body is not parsed.
+
+  ```text
+  { ... }
+  ^     ^
+  ```
+
+Other data structures are the same as data structures of [syn]. These are defined in this crate because they cannot be used in [syn] without "full" feature.
+
+[syn]: https://github.com/dtolnay/syn
+
+## Usage
+
+Add this to your `Cargo.toml`:
+
+```toml
+[dependencies]
+syn-mid = "0.5"
+```
+
+The current syn-mid requires Rust 1.31 or later.
+
+[**Examples**](examples)
+
+[**Documentation**](https://docs.rs/syn-mid/)
+
+## Optional features
+
+* **`clone-impls`** — Clone impls for all syntax tree types.
+
+## License
+
+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 the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.
diff --git a/ci/install-component.sh b/ci/install-component.sh
new file mode 100644
index 0000000..943755c
--- /dev/null
+++ b/ci/install-component.sh
@@ -0,0 +1,29 @@
+#!/bin/bash
+
+set -euo pipefail
+
+component="${1}"
+
+if ! rustup component add "${component}" 2>/dev/null; then
+    # If the component is unavailable on the latest nightly,
+    # use the latest toolchain with the component available.
+    # Refs: https://github.com/rust-lang/rustup-components-history#the-web-part
+    target=$(curl -sSf "https://rust-lang.github.io/rustup-components-history/x86_64-unknown-linux-gnu/${component}")
+    echo "'${component}' is unavailable on the default toolchain, use the toolchain 'nightly-${target}' instead"
+
+    rustup update "nightly-${target}" --no-self-update
+    rustup default "nightly-${target}"
+
+    echo "Query rust and cargo versions:"
+    rustup -V
+    rustc -V
+    cargo -V
+
+    rustup component add "${component}"
+fi
+
+echo "Query component versions:"
+case "${component}" in
+    clippy | miri) cargo "${component}" -V ;;
+    rustfmt) "${component}" -V ;;
+esac
diff --git a/ci/install-rust.sh b/ci/install-rust.sh
new file mode 100644
index 0000000..3e0b27a
--- /dev/null
+++ b/ci/install-rust.sh
@@ -0,0 +1,20 @@
+#!/bin/bash
+
+set -euo pipefail
+
+toolchain="${1:-nightly}"
+
+if rustup -V 2>/dev/null; then
+    rustup set profile minimal
+    rustup update "${toolchain}" --no-self-update
+    rustup default "${toolchain}"
+else
+    curl -sSf https://sh.rustup.rs | sh -s -- -y --profile minimal --default-toolchain "${toolchain}"
+    export PATH=${PATH}:${HOME}/.cargo/bin
+    echo "##[add-path]${HOME}/.cargo/bin"
+fi
+
+echo "Query rust and cargo versions:"
+rustup -V
+rustc -V
+cargo -V
diff --git a/src/arg.rs b/src/arg.rs
new file mode 100644
index 0000000..593a1ac
--- /dev/null
+++ b/src/arg.rs
@@ -0,0 +1,99 @@
+use syn::{Attribute, Lifetime, Token};
+
+use super::PatType;
+
+ast_enum_of_structs! {
+    /// An argument in a function signature: the `n: usize` in `fn f(n: usize)`.
+    pub enum FnArg {
+        /// The `self` argument of an associated method, whether taken by value
+        /// or by reference.
+        Receiver(Receiver),
+
+        /// A function argument accepted by pattern and type.
+        Typed(PatType),
+    }
+}
+
+ast_struct! {
+    /// The `self` argument of an associated method, whether taken by value
+    /// or by reference.
+    pub struct Receiver {
+        pub attrs: Vec<Attribute>,
+        pub reference: Option<(Token![&], Option<Lifetime>)>,
+        pub mutability: Option<Token![mut]>,
+        pub self_token: Token![self],
+    }
+}
+
+mod parsing {
+    use syn::{
+        parse::{discouraged::Speculative, Parse, ParseStream, Result},
+        Attribute, Token,
+    };
+
+    use super::{FnArg, PatType, Receiver};
+
+    impl Parse for FnArg {
+        fn parse(input: ParseStream<'_>) -> Result<Self> {
+            let attrs = input.call(Attribute::parse_outer)?;
+
+            let ahead = input.fork();
+            if let Ok(mut receiver) = ahead.parse::<Receiver>() {
+                if !ahead.peek(Token![:]) {
+                    input.advance_to(&ahead);
+                    receiver.attrs = attrs;
+                    return Ok(FnArg::Receiver(receiver));
+                }
+            }
+
+            let mut typed = input.call(fn_arg_typed)?;
+            typed.attrs = attrs;
+            Ok(FnArg::Typed(typed))
+        }
+    }
+
+    impl Parse for Receiver {
+        fn parse(input: ParseStream<'_>) -> Result<Self> {
+            Ok(Self {
+                attrs: Vec::new(),
+                reference: {
+                    if input.peek(Token![&]) {
+                        Some((input.parse()?, input.parse()?))
+                    } else {
+                        None
+                    }
+                },
+                mutability: input.parse()?,
+                self_token: input.parse()?,
+            })
+        }
+    }
+
+    fn fn_arg_typed(input: ParseStream<'_>) -> Result<PatType> {
+        Ok(PatType {
+            attrs: Vec::new(),
+            pat: input.parse()?,
+            colon_token: input.parse()?,
+            ty: Box::new(input.parse()?),
+        })
+    }
+}
+
+mod printing {
+    use proc_macro2::TokenStream;
+    use quote::{ToTokens, TokenStreamExt};
+
+    use super::Receiver;
+
+    impl ToTokens for Receiver {
+        fn to_tokens(&self, tokens: &mut TokenStream) {
+            tokens.append_all(&self.attrs);
+            if let Some((ampersand, lifetime)) = &self.reference {
+                ampersand.to_tokens(tokens);
+                lifetime.to_tokens(tokens);
+            }
+            self.mutability.to_tokens(tokens);
+            self.self_token.to_tokens(tokens);
+        }
+    }
+}
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..3b21506
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,238 @@
+//! Providing the features between "full" and "derive" of syn.
+//!
+//! This crate provides the following two unique data structures.
+//!
+//! * [`syn_mid::ItemFn`] -- A function whose body is not parsed.
+//!
+//!   ```text
+//!   fn process(n: usize) -> Result<()> { ... }
+//!   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ ^     ^
+//!   ```
+//!
+//! * [`syn_mid::Block`] -- A block whose body is not parsed.
+//!
+//!   ```text
+//!   { ... }
+//!   ^     ^
+//!   ```
+//!
+//! Other data structures are the same as data structures of [syn]. These are defined in this crate
+//! because they cannot be used in [syn] without "full" feature.
+//!
+//! ## Optional features
+//!
+//! syn-mid in the default features aims to provide the features between "full"
+//! and "derive" of [syn].
+//!
+//! * **`clone-impls`** — Clone impls for all syntax tree types.
+//!
+//! [`syn_mid::ItemFn`]: struct.ItemFn.html
+//! [`syn_mid::Block`]: struct.Block.html
+//! [syn]: https://github.com/dtolnay/syn
+
+#![doc(html_root_url = "https://docs.rs/syn-mid/0.5.0")]
+#![doc(test(
+    no_crate_inject,
+    attr(deny(warnings, rust_2018_idioms, single_use_lifetimes), allow(dead_code))
+))]
+#![forbid(unsafe_code)]
+#![warn(rust_2018_idioms, single_use_lifetimes, unreachable_pub)]
+#![warn(clippy::all)]
+#![allow(clippy::eval_order_dependence, clippy::large_enum_variant)]
+
+// Many of the code contained in this crate are copies from https://github.com/dtolnay/syn.
+
+#[macro_use]
+mod macros;
+
+mod arg;
+mod pat;
+mod path;
+
+pub use self::{arg::*, pat::*};
+
+use proc_macro2::TokenStream;
+use syn::{
+    punctuated::Punctuated, token, Abi, Attribute, Generics, Ident, ReturnType, Token, Variadic,
+    Visibility,
+};
+
+ast_struct! {
+    /// A braced block containing Rust statements.
+    pub struct Block {
+        pub brace_token: token::Brace,
+        /// Statements in a block
+        pub stmts: TokenStream,
+    }
+}
+
+ast_struct! {
+    /// A free-standing function: `fn process(n: usize) -> Result<()> { ...
+    /// }`.
+    pub struct ItemFn {
+        pub attrs: Vec<Attribute>,
+        pub vis: Visibility,
+        pub sig: Signature,
+        pub block: Box<Block>,
+    }
+}
+
+ast_struct! {
+    /// A function signature in a trait or implementation: `unsafe fn
+    /// initialize(&self)`.
+    pub struct Signature {
+        pub constness: Option<Token![const]>,
+        pub asyncness: Option<Token![async]>,
+        pub unsafety: Option<Token![unsafe]>,
+        pub abi: Option<Abi>,
+        pub fn_token: Token![fn],
+        pub ident: Ident,
+        pub generics: Generics,
+        pub paren_token: token::Paren,
+        pub inputs: Punctuated<FnArg, Token![,]>,
+        pub variadic: Option<Variadic>,
+        pub output: ReturnType,
+    }
+}
+
+mod parsing {
+    use syn::{
+        braced, parenthesized,
+        parse::{Parse, ParseStream, Result},
+        parse2, Abi, Attribute, Generics, Ident, ReturnType, Token, Type, Variadic, Visibility,
+        WhereClause,
+    };
+
+    use super::{Block, FnArg, ItemFn, PatType, Signature};
+
+    impl Parse for Block {
+        fn parse(input: ParseStream<'_>) -> Result<Self> {
+            let content;
+            Ok(Self { brace_token: braced!(content in input), stmts: content.parse()? })
+        }
+    }
+
+    impl Parse for ItemFn {
+        fn parse(input: ParseStream<'_>) -> Result<Self> {
+            let attrs = input.call(Attribute::parse_outer)?;
+            let vis: Visibility = input.parse()?;
+            let constness: Option<Token![const]> = input.parse()?;
+            let asyncness: Option<Token![async]> = input.parse()?;
+            let unsafety: Option<Token![unsafe]> = input.parse()?;
+            let abi: Option<Abi> = input.parse()?;
+            let fn_token: Token![fn] = input.parse()?;
+            let ident: Ident = input.parse()?;
+            let generics: Generics = input.parse()?;
+
+            let content;
+            let paren_token = parenthesized!(content in input);
+            let inputs = content.parse_terminated(FnArg::parse)?;
+            let variadic = inputs.last().as_ref().and_then(get_variadic);
+
+            #[allow(clippy::trivially_copy_pass_by_ref)]
+            fn get_variadic(input: &&FnArg) -> Option<Variadic> {
+                if let FnArg::Typed(PatType { ty, .. }) = input {
+                    if let Type::Verbatim(tokens) = &**ty {
+                        if let Ok(dots) = parse2(tokens.clone()) {
+                            return Some(Variadic { attrs: Vec::new(), dots });
+                        }
+                    }
+                }
+                None
+            }
+
+            let output: ReturnType = input.parse()?;
+            let where_clause: Option<WhereClause> = input.parse()?;
+
+            let block = input.parse()?;
+
+            Ok(Self {
+                attrs,
+                vis,
+                sig: Signature {
+                    constness,
+                    asyncness,
+                    unsafety,
+                    abi,
+                    fn_token,
+                    ident,
+                    paren_token,
+                    inputs,
+                    output,
+                    variadic,
+                    generics: Generics { where_clause, ..generics },
+                },
+                block: Box::new(block),
+            })
+        }
+    }
+}
+
+mod printing {
+    use proc_macro2::TokenStream;
+    use quote::{ToTokens, TokenStreamExt};
+    use syn::{punctuated::Punctuated, Token, Type};
+
+    use super::{Block, FnArg, ItemFn, Signature};
+
+    impl ToTokens for Block {
+        fn to_tokens(&self, tokens: &mut TokenStream) {
+            self.brace_token.surround(tokens, |tokens| {
+                tokens.append_all(self.stmts.clone());
+            });
+        }
+    }
+
+    fn has_variadic(inputs: &Punctuated<FnArg, Token![,]>) -> bool {
+        let last = match inputs.last() {
+            Some(last) => last,
+            None => return false,
+        };
+
+        let pat = match last {
+            FnArg::Typed(pat) => pat,
+            FnArg::Receiver(_) => return false,
+        };
+
+        let tokens = match pat.ty.as_ref() {
+            Type::Verbatim(tokens) => tokens,
+            _ => return false,
+        };
+
+        tokens.to_string() == "..."
+    }
+
+    impl ToTokens for Signature {
+        fn to_tokens(&self, tokens: &mut TokenStream) {
+            self.constness.to_tokens(tokens);
+            self.asyncness.to_tokens(tokens);
+            self.unsafety.to_tokens(tokens);
+            self.abi.to_tokens(tokens);
+            self.fn_token.to_tokens(tokens);
+            self.ident.to_tokens(tokens);
+            self.generics.to_tokens(tokens);
+            self.paren_token.surround(tokens, |tokens| {
+                self.inputs.to_tokens(tokens);
+                if self.variadic.is_some() && !has_variadic(&self.inputs) {
+                    if !self.inputs.empty_or_trailing() {
+                        <Token![,]>::default().to_tokens(tokens);
+                    }
+                    self.variadic.to_tokens(tokens);
+                }
+            });
+            self.output.to_tokens(tokens);
+            self.generics.where_clause.to_tokens(tokens);
+        }
+    }
+
+    impl ToTokens for ItemFn {
+        fn to_tokens(&self, tokens: &mut TokenStream) {
+            tokens.append_all(&self.attrs);
+            self.vis.to_tokens(tokens);
+            self.sig.to_tokens(tokens);
+            self.block.brace_token.surround(tokens, |tokens| {
+                tokens.append_all(self.block.stmts.clone());
+            });
+        }
+    }
+}
diff --git a/src/macros.rs b/src/macros.rs
new file mode 100644
index 0000000..87be7b4
--- /dev/null
+++ b/src/macros.rs
@@ -0,0 +1,107 @@
+macro_rules! ast_struct {
+    (
+        [$($attrs_pub:tt)*]
+        struct $name:ident $($rest:tt)*
+    ) => {
+        #[cfg_attr(feature = "clone-impls", derive(Clone))]
+        $($attrs_pub)* struct $name $($rest)*
+    };
+
+    ($($t:tt)*) => {
+        strip_attrs_pub!(ast_struct!($($t)*));
+    };
+}
+
+macro_rules! ast_enum {
+    (
+        [$($attrs_pub:tt)*]
+        enum $name:ident $($rest:tt)*
+    ) => (
+        #[cfg_attr(feature = "clone-impls", derive(Clone))]
+        $($attrs_pub)* enum $name $($rest)*
+    );
+
+    ($($t:tt)*) => {
+        strip_attrs_pub!(ast_enum!($($t)*));
+    };
+}
+
+macro_rules! ast_enum_of_structs {
+    (
+        $(#[$enum_attr:meta])*
+        $pub:ident $enum:ident $name:ident $body:tt
+    ) => {
+        ast_enum!($(#[$enum_attr])* $pub $enum $name $body);
+        ast_enum_of_structs_impl!($pub $enum $name $body);
+    };
+}
+
+macro_rules! ast_enum_of_structs_impl {
+    (
+        $pub:ident $enum:ident $name:ident {
+            $(
+                $(#[$variant_attr:meta])*
+                $variant:ident $( ($member:ident) )*,
+            )*
+        }
+    ) => {
+        check_keyword_matches!(pub $pub);
+        check_keyword_matches!(enum $enum);
+
+        $(
+            $(
+                impl From<$member> for $name {
+                    fn from(e: $member) -> $name {
+                        $name::$variant(e)
+                    }
+                }
+            )*
+        )*
+
+        generate_to_tokens! {
+            ()
+            tokens
+            $name { $($variant $($member)*,)* }
+        }
+    };
+}
+
+macro_rules! generate_to_tokens {
+    (($($arms:tt)*) $tokens:ident $name:ident { $variant:ident, $($next:tt)*}) => {
+        generate_to_tokens!(
+            ($($arms)* $name::$variant => {})
+            $tokens $name { $($next)* }
+        );
+    };
+
+    (($($arms:tt)*) $tokens:ident $name:ident { $variant:ident $member:ident, $($next:tt)*}) => {
+        generate_to_tokens!(
+            ($($arms)* $name::$variant(_e) => quote::ToTokens::to_tokens(_e, $tokens),)
+            $tokens $name { $($next)* }
+        );
+    };
+
+    (($($arms:tt)*) $tokens:ident $name:ident {}) => {
+        impl quote::ToTokens for $name {
+            fn to_tokens(&self, $tokens: &mut proc_macro2::TokenStream) {
+                match self {
+                    $($arms)*
+                }
+            }
+        }
+    };
+}
+
+macro_rules! strip_attrs_pub {
+    ($mac:ident!($(#[$m:meta])* $pub:ident $($t:tt)*)) => {
+        check_keyword_matches!(pub $pub);
+
+        $mac!([$(#[$m])* $pub] $($t)*);
+    };
+}
+
+macro_rules! check_keyword_matches {
+    (struct struct) => {};
+    (enum enum) => {};
+    (pub pub) => {};
+}
diff --git a/src/pat.rs b/src/pat.rs
new file mode 100644
index 0000000..ff1277f
--- /dev/null
+++ b/src/pat.rs
@@ -0,0 +1,389 @@
+use syn::{punctuated::Punctuated, token, Attribute, Ident, Member, Path, Token, Type};
+
+ast_enum_of_structs! {
+    /// A pattern in a local binding, function signature, match expression, or
+    /// various other places.
+    ///
+    /// # Syntax tree enum
+    ///
+    /// This type is a [syntax tree enum].
+    ///
+    /// [syntax tree enum]: enum.Expr.html#syntax-tree-enums
+    pub enum Pat {
+        /// A pattern that binds a new variable: `ref mut binding @ SUBPATTERN`.
+        Ident(PatIdent),
+
+        /// A path pattern like `Color::Red`.
+        Path(PatPath),
+
+        /// A reference pattern: `&mut var`.
+        Reference(PatReference),
+
+        /// A struct or struct variant pattern: `Variant { x, y, .. }`.
+        Struct(PatStruct),
+
+        /// A tuple pattern: `(a, b)`.
+        Tuple(PatTuple),
+
+        /// A tuple struct or tuple variant pattern: `Variant(x, y, .., z)`.
+        TupleStruct(PatTupleStruct),
+
+        /// A type ascription pattern: `foo: f64`.
+        Type(PatType),
+
+        /// A pattern that matches any value: `_`.
+        Wild(PatWild),
+
+        #[doc(hidden)]
+        __Nonexhaustive,
+    }
+}
+
+ast_struct! {
+    /// A pattern that binds a new variable: `ref mut binding @ SUBPATTERN`.
+    pub struct PatIdent {
+        pub attrs: Vec<Attribute>,
+        pub by_ref: Option<Token![ref]>,
+        pub mutability: Option<Token![mut]>,
+        pub ident: Ident,
+    }
+}
+
+ast_struct! {
+    /// A path pattern like `Color::Red`.
+    pub struct PatPath {
+        pub attrs: Vec<Attribute>,
+        pub path: Path,
+    }
+}
+
+ast_struct! {
+    /// A reference pattern: `&mut var`.
+    pub struct PatReference {
+        pub attrs: Vec<Attribute>,
+        pub and_token: Token![&],
+        pub mutability: Option<Token![mut]>,
+        pub pat: Box<Pat>,
+    }
+}
+
+ast_struct! {
+    /// A struct or struct variant pattern: `Variant { x, y, .. }`.
+    pub struct PatStruct {
+        pub attrs: Vec<Attribute>,
+        pub path: Path,
+        pub brace_token: token::Brace,
+        pub fields: Punctuated<FieldPat, Token![,]>,
+        pub dot2_token: Option<Token![..]>,
+    }
+}
+
+ast_struct! {
+    /// A tuple pattern: `(a, b)`.
+    pub struct PatTuple {
+        pub attrs: Vec<Attribute>,
+        pub paren_token: token::Paren,
+        pub elems: Punctuated<Pat, Token![,]>,
+    }
+}
+
+ast_struct! {
+    /// A tuple struct or tuple variant pattern: `Variant(x, y, .., z)`.
+    pub struct PatTupleStruct {
+        pub attrs: Vec<Attribute>,
+        pub path: Path,
+        pub pat: PatTuple,
+    }
+}
+
+ast_struct! {
+    /// A type ascription pattern: `foo: f64`.
+    pub struct PatType {
+        pub attrs: Vec<Attribute>,
+        pub pat: Box<Pat>,
+        pub colon_token: Token![:],
+        pub ty: Box<Type>,
+    }
+}
+
+ast_struct! {
+    /// A pattern that matches any value: `_`.
+    pub struct PatWild {
+        pub attrs: Vec<Attribute>,
+        pub underscore_token: Token![_],
+    }
+}
+
+ast_struct! {
+    /// A single field in a struct pattern.
+    ///
+    /// Patterns like the fields of Foo `{ x, ref y, ref mut z }` are treated
+    /// the same as `x: x, y: ref y, z: ref mut z` but there is no colon token.
+    pub struct FieldPat {
+        pub attrs: Vec<Attribute>,
+        pub member: Member,
+        pub colon_token: Option<Token![:]>,
+        pub pat: Box<Pat>,
+    }
+}
+
+mod parsing {
+    use syn::{
+        braced,
+        ext::IdentExt,
+        parenthesized,
+        parse::{Parse, ParseStream, Result},
+        punctuated::Punctuated,
+        token, Ident, Member, Path, Token,
+    };
+
+    use crate::path;
+
+    use super::{
+        FieldPat, Pat, PatIdent, PatPath, PatReference, PatStruct, PatTuple, PatTupleStruct,
+        PatWild,
+    };
+
+    impl Parse for Pat {
+        fn parse(input: ParseStream<'_>) -> Result<Self> {
+            let lookahead = input.lookahead1();
+            if lookahead.peek(Ident)
+                && ({
+                    input.peek2(Token![::])
+                        || input.peek2(token::Brace)
+                        || input.peek2(token::Paren)
+                })
+                || input.peek(Token![self]) && input.peek2(Token![::])
+                || lookahead.peek(Token![::])
+                || lookahead.peek(Token![<])
+                || input.peek(Token![Self])
+                || input.peek(Token![super])
+                || input.peek(Token![extern])
+                || input.peek(Token![crate])
+            {
+                pat_path_or_struct(input)
+            } else if lookahead.peek(Token![_]) {
+                input.call(pat_wild).map(Pat::Wild)
+            } else if lookahead.peek(Token![ref])
+                || lookahead.peek(Token![mut])
+                || input.peek(Token![self])
+                || input.peek(Ident)
+            {
+                input.call(pat_ident).map(Pat::Ident)
+            } else if lookahead.peek(Token![&]) {
+                input.call(pat_reference).map(Pat::Reference)
+            } else if lookahead.peek(token::Paren) {
+                input.call(pat_tuple).map(Pat::Tuple)
+            } else {
+                Err(lookahead.error())
+            }
+        }
+    }
+
+    fn pat_path_or_struct(input: ParseStream<'_>) -> Result<Pat> {
+        let path = path::parse_path(input)?;
+
+        if input.peek(token::Brace) {
+            pat_struct(input, path).map(Pat::Struct)
+        } else if input.peek(token::Paren) {
+            pat_tuple_struct(input, path).map(Pat::TupleStruct)
+        } else {
+            Ok(Pat::Path(PatPath { attrs: Vec::new(), path }))
+        }
+    }
+
+    fn pat_wild(input: ParseStream<'_>) -> Result<PatWild> {
+        Ok(PatWild { attrs: Vec::new(), underscore_token: input.parse()? })
+    }
+
+    fn pat_ident(input: ParseStream<'_>) -> Result<PatIdent> {
+        Ok(PatIdent {
+            attrs: Vec::new(),
+            by_ref: input.parse()?,
+            mutability: input.parse()?,
+            ident: input.call(Ident::parse_any)?,
+        })
+    }
+
+    fn pat_tuple_struct(input: ParseStream<'_>, path: Path) -> Result<PatTupleStruct> {
+        Ok(PatTupleStruct { attrs: Vec::new(), path, pat: input.call(pat_tuple)? })
+    }
+
+    fn pat_struct(input: ParseStream<'_>, path: Path) -> Result<PatStruct> {
+        let content;
+        let brace_token = braced!(content in input);
+
+        let mut fields = Punctuated::new();
+        while !content.is_empty() && !content.peek(Token![..]) {
+            let value = content.call(field_pat)?;
+            fields.push_value(value);
+            if !content.peek(Token![,]) {
+                break;
+            }
+            let punct: Token![,] = content.parse()?;
+            fields.push_punct(punct);
+        }
+
+        let dot2_token = if fields.empty_or_trailing() && content.peek(Token![..]) {
+            Some(content.parse()?)
+        } else {
+            None
+        };
+
+        Ok(PatStruct { attrs: Vec::new(), path, brace_token, fields, dot2_token })
+    }
+
+    fn field_pat(input: ParseStream<'_>) -> Result<FieldPat> {
+        let boxed: Option<Token![box]> = input.parse()?;
+        let by_ref: Option<Token![ref]> = input.parse()?;
+        let mutability: Option<Token![mut]> = input.parse()?;
+        let member: Member = input.parse()?;
+
+        if boxed.is_none() && by_ref.is_none() && mutability.is_none() && input.peek(Token![:])
+            || is_unnamed(&member)
+        {
+            return Ok(FieldPat {
+                attrs: Vec::new(),
+                member,
+                colon_token: input.parse()?,
+                pat: input.parse()?,
+            });
+        }
+
+        let ident = match member {
+            Member::Named(ident) => ident,
+            Member::Unnamed(_) => unreachable!(),
+        };
+
+        let pat =
+            Pat::Ident(PatIdent { attrs: Vec::new(), by_ref, mutability, ident: ident.clone() });
+
+        Ok(FieldPat {
+            member: Member::Named(ident),
+            pat: Box::new(pat),
+            attrs: Vec::new(),
+            colon_token: None,
+        })
+    }
+
+    fn pat_tuple(input: ParseStream<'_>) -> Result<PatTuple> {
+        let content;
+        let paren_token = parenthesized!(content in input);
+
+        let mut elems = Punctuated::new();
+        while !content.is_empty() {
+            let value: Pat = content.parse()?;
+            elems.push_value(value);
+            if content.is_empty() {
+                break;
+            }
+            let punct = content.parse()?;
+            elems.push_punct(punct);
+        }
+
+        Ok(PatTuple { attrs: Vec::new(), paren_token, elems })
+    }
+
+    fn pat_reference(input: ParseStream<'_>) -> Result<PatReference> {
+        Ok(PatReference {
+            attrs: Vec::new(),
+            and_token: input.parse()?,
+            mutability: input.parse()?,
+            pat: input.parse()?,
+        })
+    }
+
+    fn is_unnamed(member: &Member) -> bool {
+        match member {
+            Member::Named(_) => false,
+            Member::Unnamed(_) => true,
+        }
+    }
+}
+
+mod printing {
+    use proc_macro2::TokenStream;
+    use quote::{ToTokens, TokenStreamExt};
+    use syn::Token;
+
+    use super::{
+        FieldPat, PatIdent, PatPath, PatReference, PatStruct, PatTuple, PatTupleStruct, PatType,
+        PatWild,
+    };
+
+    impl ToTokens for PatWild {
+        fn to_tokens(&self, tokens: &mut TokenStream) {
+            self.underscore_token.to_tokens(tokens);
+        }
+    }
+
+    impl ToTokens for PatIdent {
+        fn to_tokens(&self, tokens: &mut TokenStream) {
+            self.by_ref.to_tokens(tokens);
+            self.mutability.to_tokens(tokens);
+            self.ident.to_tokens(tokens);
+        }
+    }
+
+    impl ToTokens for PatStruct {
+        fn to_tokens(&self, tokens: &mut TokenStream) {
+            self.path.to_tokens(tokens);
+            self.brace_token.surround(tokens, |tokens| {
+                self.fields.to_tokens(tokens);
+                // NOTE: We need a comma before the dot2 token if it is present.
+                if !self.fields.empty_or_trailing() && self.dot2_token.is_some() {
+                    <Token![,]>::default().to_tokens(tokens);
+                }
+                self.dot2_token.to_tokens(tokens);
+            });
+        }
+    }
+
+    impl ToTokens for PatTupleStruct {
+        fn to_tokens(&self, tokens: &mut TokenStream) {
+            self.path.to_tokens(tokens);
+            self.pat.to_tokens(tokens);
+        }
+    }
+
+    impl ToTokens for PatType {
+        fn to_tokens(&self, tokens: &mut TokenStream) {
+            tokens.append_all(&self.attrs);
+            self.pat.to_tokens(tokens);
+            self.colon_token.to_tokens(tokens);
+            self.ty.to_tokens(tokens);
+        }
+    }
+
+    impl ToTokens for PatPath {
+        fn to_tokens(&self, tokens: &mut TokenStream) {
+            self.path.to_tokens(tokens)
+        }
+    }
+
+    impl ToTokens for PatTuple {
+        fn to_tokens(&self, tokens: &mut TokenStream) {
+            self.paren_token.surround(tokens, |tokens| {
+                self.elems.to_tokens(tokens);
+            });
+        }
+    }
+
+    impl ToTokens for PatReference {
+        fn to_tokens(&self, tokens: &mut TokenStream) {
+            self.and_token.to_tokens(tokens);
+            self.mutability.to_tokens(tokens);
+            self.pat.to_tokens(tokens);
+        }
+    }
+
+    impl ToTokens for FieldPat {
+        fn to_tokens(&self, tokens: &mut TokenStream) {
+            if let Some(colon_token) = &self.colon_token {
+                self.member.to_tokens(tokens);
+                colon_token.to_tokens(tokens);
+            }
+            self.pat.to_tokens(tokens);
+        }
+    }
+}
diff --git a/src/path.rs b/src/path.rs
new file mode 100644
index 0000000..408cda7
--- /dev/null
+++ b/src/path.rs
@@ -0,0 +1,44 @@
+use syn::{
+    ext::IdentExt,
+    parse::{ParseStream, Result},
+    punctuated::Punctuated,
+    Ident, Path, PathArguments, PathSegment, Token,
+};
+
+fn parse_path_segment(input: ParseStream<'_>) -> Result<PathSegment> {
+    if input.peek(Token![super])
+        || input.peek(Token![self])
+        || input.peek(Token![crate])
+        || input.peek(Token![extern])
+    {
+        let ident = input.call(Ident::parse_any)?;
+        return Ok(PathSegment::from(ident));
+    }
+
+    let ident =
+        if input.peek(Token![Self]) { input.call(Ident::parse_any)? } else { input.parse()? };
+
+    if input.peek(Token![::]) && input.peek3(Token![<]) {
+        Ok(PathSegment { ident, arguments: PathArguments::AngleBracketed(input.parse()?) })
+    } else {
+        Ok(PathSegment::from(ident))
+    }
+}
+
+pub(crate) fn parse_path(input: ParseStream<'_>) -> Result<Path> {
+    Ok(Path {
+        leading_colon: input.parse()?,
+        segments: {
+            let mut segments = Punctuated::new();
+            let value = parse_path_segment(input)?;
+            segments.push_value(value);
+            while input.peek(Token![::]) {
+                let punct: Token![::] = input.parse()?;
+                segments.push_punct(punct);
+                let value = parse_path_segment(input)?;
+                segments.push_value(value);
+            }
+            segments
+        },
+    })
+}