Initial import of static_assertions-1.1.0 am: 03460c13ad

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/static_assertions/+/2287738

Change-Id: Idb534468eaeb700093fd1fd267561cb3e6f281d4
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>

34 files changed, 2738 insertions, 0 deletions

diff --git a/CHANGELOG.md b/CHANGELOG.md
new file mode 100644
index 0000000..80d5507
--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,181 @@
+# Changelog [![Crates.io][crate-badge]][crate]
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog] and this project adheres to
+[Semantic Versioning].
+
+## [Unreleased]
+
+## [1.1.0] - 2019-11-03
+### Added
+- `assert_impl_any!` macro
+- `assert_impl_one!` macro
+- `assert_trait_sub_all!` macro
+- `assert_trait_super_all!` macro
+- Frequently asked questions to `README.md`
+
+### Fixed
+- `assert_eq_size_val!`, `const_assert_eq!`, and `const_assert_ne!` to export
+  their local inner macros. Not having this prevented them from working when
+  `use`d or called directly via `static_assertions::macro!(...)`
+
+### Removed
+- Unused `_assert_obj_safe!` from pre-1.0
+
+## [1.0.0] - 2019-10-02
+### Added
+- `assert_eq_align!` macro
+
+### Removed
+- **[breaking]** Labels from macros that needed them 🎉
+  - Made possible by [`const _`] in Rust 1.37
+- **[breaking]** `assert_impl!` macro
+
+### Fixed
+- `assert_fields!` now works for `enum` types with multiple variants
+
+### Changed
+- **[breaking]** `const_assert!` macro to only take one expression
+  - Reasoning: when custom error messages are added in the future (via
+    [`assert!`]), having the macro allow for multiple comma-separated
+    expressions may lead to ambiguity
+- **[breaking]** Trait assertions to use `Type: Trait` syntax
+- **[breaking]** Field assertions to use `Type: field1, field2` syntax
+- **[breaking]** Renamed `assert_{ne,eq}_type!` to `assert_type_{ne,eq}_all!`
+
+## [0.3.4] - 2019-06-12
+### Changed
+- Aliased `assert_impl!` to `assert_impl_all!` and deprecated `assert_impl!`
+
+### Added
+- `assert_impl_all!` as replacement to `assert_impl!`
+- `assert_not_impl_all!` and `assert_not_impl_any!` macro counterparts to
+  `assert_impl_all!`
+
+### Fixed
+- `assert_eq_type!` now works with types involving lifetimes
+
+## [0.3.3] - 2019-06-12
+### Added
+- `const_assert_ne!` macro counterpart to `const_assert_eq!`
+
+### Fixed
+- `assert_eq_type!` would pass when types can coerce via `Deref`, such as with
+  `str` and `String`
+
+## [0.3.2] - 2019-05-15
+### Added
+- A `assert_eq_type!` macro that allows for checking whether inputs are the same
+  concrete type
+- A `assert_ne_type!` macro for checking whether inputs all refer to different
+  types
+
+### Fixed
+- `const_assert!` now only takes `bool` values whereas integer (or other type)
+  values could previously be passed
+
+## [0.3.1] - 2018-11-15
+### Fixed
+- Macros that refer to other internal macros can now be imported when compiling
+  for Rust 2018 ([issue
+  #10](https://github.com/nvzqz/static-assertions-rs/issues/10))
+
+## [0.3.0] - 2018-11-14
+### Changed
+- Bumped minimum supported (automatically tested) Rust version to 1.24.0
+- Moved message parameter for `assert_cfg!()` to last argument position, making
+  it consistent with other macros
+
+### Removed
+- No need to use `macro!(label; ...)` syntax when compiling on nightly Rust and
+  enabling the `nightly` feature flag
+
+## [0.2.5] - 2017-12-12
+### Changed
+- `assert_eq_size_ptr` wraps its code inside of a closure, ensuring that the
+  unsafe code inside never runs
+- Clippy no longer warns about `unneeded_field_pattern` within `assert_fields`
+
+### Added
+- Much better documentation with test examples that are guaranteed to fail at
+  compile-time
+
+### Removed
+- Removed testing features; compile failure tests are now done via doc tests
+
+## [0.2.4] - 2017-12-11
+### Removed
+- Removed the actual call to `mem::transmute` while still utilizing it for size
+  verification ([Simon Sapin], [#5])
+
+### Added
+- `assert_cfg` macro that asserts that the given configuration is set
+- `assert_fields` macro to assert that a struct type or enum variant has a given
+  field
+
+### Fixed
+- Allow more generics flexibility in `assert_impl`
+
+## [0.2.3] - 2017-08-24
+### Fixed
+- Trailing commas are now allowed
+
+### Removed
+- Removed clippy warnings
+
+## [0.2.2] - 2017-08-13
+### Added
+- Added `assert_impl` macro to ensure a type implements a given set of traits
+
+## [0.2.1] - 2017-08-13
+### Added
+- Added `assert_obj_safe` macro for ensuring that a trait is object-safe
+
+## [0.2.0] - 2017-08-12
+### Added
+- Added `assert_eq_size_ptr` macro
+
+### Fixed
+- Allow `assert_eq_size`, `const_assert`, and `const_assert_eq` in non-function
+  contexts via providing a unique label [#1]
+
+### Removed
+- **[Breaking]** Semicolon-separated `assert_eq_size` is no longer allowed
+
+## [0.1.1] - 2017-08-12
+### Added
+- Added `const_assert_eq` macro
+
+## 0.1.0 - 2017-08-12
+
+Initial release
+
+[Simon Sapin]: https://github.com/SimonSapin
+
+[`assert!`]: https://doc.rust-lang.org/stable/std/macro.assert.html
+[`const _`]: https://github.com/rust-lang/rfcs/blob/master/text/2526-const-wildcard.md
+
+[#1]: https://github.com/nvzqz/static-assertions-rs/issues/1
+[#5]: https://github.com/nvzqz/static-assertions-rs/pull/5
+
+[crate]:       https://crates.io/crates/static_assertions
+[crate-badge]: https://img.shields.io/crates/v/static_assertions.svg
+
+[Keep a Changelog]:    http://keepachangelog.com/en/1.0.0/
+[Semantic Versioning]: http://semver.org/spec/v2.0.0.html
+
+[Unreleased]: https://github.com/nvzqz/static-assertions-rs/compare/v1.1.0...HEAD
+[1.1.0]: https://github.com/nvzqz/static-assertions-rs/compare/v1.0.0...v1.1.0
+[1.0.0]: https://github.com/nvzqz/static-assertions-rs/compare/v0.3.4...v1.0.0
+[0.3.4]: https://github.com/nvzqz/static-assertions-rs/compare/v0.3.3...v0.3.4
+[0.3.3]: https://github.com/nvzqz/static-assertions-rs/compare/v0.3.2...v0.3.3
+[0.3.2]: https://github.com/nvzqz/static-assertions-rs/compare/v0.3.1...v0.3.2
+[0.3.1]: https://github.com/nvzqz/static-assertions-rs/compare/v0.3.0...v0.3.1
+[0.3.0]: https://github.com/nvzqz/static-assertions-rs/compare/v0.2.5...v0.3.0
+[0.2.5]: https://github.com/nvzqz/static-assertions-rs/compare/v0.2.4...v0.2.5
+[0.2.4]: https://github.com/nvzqz/static-assertions-rs/compare/v0.2.3...v0.2.4
+[0.2.3]: https://github.com/nvzqz/static-assertions-rs/compare/v0.2.2...v0.2.3
+[0.2.2]: https://github.com/nvzqz/static-assertions-rs/compare/v0.2.1...v0.2.2
+[0.2.1]: https://github.com/nvzqz/static-assertions-rs/compare/v0.2.0...v0.2.1
+[0.2.0]: https://github.com/nvzqz/static-assertions-rs/compare/v0.1.1...v0.2.0
+[0.1.1]: https://github.com/nvzqz/static-assertions-rs/compare/v0.1.0...v0.1.1
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..39a4793
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,28 @@
+[package]
+name = "static_assertions"
+version = "1.1.0"
+authors = ["Nikolai Vazquez"]
+license = "MIT OR Apache-2.0"
+readme = "README.md"
+homepage = "https://github.com/nvzqz/static-assertions-rs"
+repository = "https://github.com/nvzqz/static-assertions-rs"
+documentation = "https://docs.rs/static_assertions/"
+categories = ["no-std", "rust-patterns", "development-tools::testing"]
+keywords = ["assert", "static", "testing"]
+description = "Compile-time assertions to ensure that invariants are met."
+include = ["Cargo.toml", "src/**/*.rs", "README.md", "CHANGELOG.md", "LICENSE*"]
+
+[dependencies.proc_static_assertions]
+version = "0.0.0"
+path = "proc"
+optional = true
+
+[workspace]
+members = ["proc"]
+
+[features]
+nightly = []
+proc = ["proc_static_assertions"]
+
+[badges]
+maintenance = { status = "actively-maintained" }
diff --git a/Cargo.toml.orig b/Cargo.toml.orig
new file mode 100644
index 0000000..30248fc
--- /dev/null
+++ b/Cargo.toml.orig
@@ -0,0 +1,22 @@
+[package]
+name = "static_assertions"
+version = "1.1.0"
+authors = ["Nikolai Vazquez"]
+license = "MIT OR Apache-2.0"
+readme = "README.md"
+homepage = "https://github.com/nvzqz/static-assertions-rs"
+repository = "https://github.com/nvzqz/static-assertions-rs"
+documentation = "https://docs.rs/static_assertions/"
+categories = ["no-std", "rust-patterns", "development-tools::testing"]
+keywords = ["assert", "static", "testing"]
+description = "Compile-time assertions to ensure that invariants are met."
+include = ["Cargo.toml", "src/**/*.rs", "README.md", "CHANGELOG.md", "LICENSE*"]
+
+[badges]
+travis-ci = { repository = "nvzqz/static-assertions-rs" }
+is-it-maintained-open-issues = { repository = "nvzqz/static-assertions-rs" }
+is-it-maintained-issue-resolution = { repository = "nvzqz/static-assertions-rs" }
+maintenance = { status = "passively-maintained" }
+
+[features]
+nightly = []
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..d645695
--- /dev/null
+++ b/LICENSE-APACHE
@@ -0,0 +1,202 @@
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diff --git a/METADATA b/METADATA
new file mode 100644
index 0000000..09317f1
--- /dev/null
+++ b/METADATA
@@ -0,0 +1,20 @@
+name: "static_assertions"
+description: "Compile-time assertions to ensure that invariants are met."
+third_party {
+  url {
+    type: HOMEPAGE
+    value: "https://crates.io/crates/static_assertions"
+  }
+  url {
+    type: ARCHIVE
+    value: "https://static.crates.io/crates/static_assertions/static_assertions-1.1.0.crate"
+  }
+  version: "1.1.0"
+  # Dual-licensed, using the least restrictive per go/thirdpartylicenses#same.
+  license_type: NOTICE
+  last_upgrade_date {
+    year: 2022
+    month: 11
+    day: 2
+  }
+}
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..75ddd70
--- /dev/null
+++ b/README.md
@@ -0,0 +1,188 @@
+[![Banner](https://raw.githubusercontent.com/nvzqz/static-assertions-rs/assets/Banner.png)](https://github.com/nvzqz/static-assertions-rs)
+
+<div align="center">
+    <a href="https://crates.io/crates/static_assertions">
+        <img src="https://img.shields.io/crates/v/static_assertions.svg" alt="Crates.io">
+        <img src="https://img.shields.io/crates/d/static_assertions.svg" alt="Downloads">
+    </a>
+    <a href="https://github.com/nvzqz/static-assertions-rs/actions?query=workflow%3ACI">
+        <img src="https://github.com/nvzqz/static-assertions-rs/workflows/CI/badge.svg" alt="Build Status">
+    </a>
+    <img src="https://img.shields.io/badge/rustc-^1.37.0-blue.svg" alt="rustc ^1.37.0">
+    <br>
+    <a href="https://www.patreon.com/nvzqz">
+        <img src="https://c5.patreon.com/external/logo/become_a_patron_button.png" alt="Become a Patron!" height="35">
+    </a>
+    <a href="https://www.paypal.me/nvzqz">
+        <img src="https://buymecoffee.intm.org/img/button-paypal-white.png" alt="Buy me a coffee" height="35">
+    </a>
+</div>
+
+Compile-time assertions for Rust, brought to you by
+[Nikolai Vazquez](https://twitter.com/NikolaiVazquez).
+
+This library lets you ensure correct assumptions about constants, types, and
+more. See the [docs] and [FAQ](#faq) for more info!
+
+## Installation
+
+This crate is available
+[on crates.io](https://crates.io/crates/static_assertions) and can be used by
+adding the following to your project's
+[`Cargo.toml`](https://doc.rust-lang.org/cargo/reference/manifest.html):
+
+```toml
+[dependencies]
+static_assertions = "1.1.0"
+```
+
+and this to your crate root (`main.rs` or `lib.rs`):
+
+```rust
+#[macro_use]
+extern crate static_assertions;
+```
+
+## Usage
+
+This crate exposes the following macros:
+- [`assert_cfg!`]
+- [`assert_eq_align!`]
+- [`assert_eq_size!`]
+- [`assert_eq_size_ptr!`]
+- [`assert_eq_size_val!`]
+- [`assert_fields!`]
+- [`assert_impl_all!`]
+- [`assert_impl_any!`]
+- [`assert_impl_one!`]
+- [`assert_not_impl_all!`]
+- [`assert_not_impl_any!`]
+- [`assert_obj_safe!`]
+- [`assert_trait_sub_all!`]
+- [`assert_trait_super_all!`]
+- [`assert_type_eq_all!`]
+- [`assert_type_ne_all!`]
+- [`const_assert!`]
+- [`const_assert_eq!`]
+- [`const_assert_ne!`]
+
+## FAQ
+
+- **Q:** When would I want to use this?
+
+  **A:** This library is useful for when wanting to ensure properties of
+  constants, types, and traits.
+
+  Basic examples:
+
+  - With the release of 1.39, `str::len` can be called in a `const`
+    context. Using [`const_assert!`], one can check that a string generated from
+    elsewhere is of a given size:
+
+    ```rust
+    const DATA: &str = include_str!("path/to/string.txt");
+
+    const_assert!(DATA.len() < 512);
+    ```
+
+  - Have a type that absolutely must implement certain traits? With
+    [`assert_impl_all!`], one can ensure this:
+
+    ```rust
+    struct Foo {
+        value: // ...
+    }
+
+    assert_impl_all!(Foo: Send, Sync);
+    ```
+
+- **Q:** How can I contribute?
+
+  **A:** A couple of ways! You can:
+
+  - Attempt coming up with some form of static analysis that you'd like to see
+    implemented. Create a [new issue] and describe how you'd imagine your
+    assertion to work, with example code to demonstrate.
+
+  - Implement your own static assertion and create a [pull request].
+
+  - Give feedback. What are some pain points? Where is it unpleasant?
+
+  - Write docs. If you're familiar with how this library works, sharing your
+    knowledge with the rest its users would be great!
+
+- **Q:** Will this affect my compiled binary?
+
+  **A:** Nope! There is zero runtime cost to using this because all checks are
+  at compile-time, and so no code is emitted to run.
+
+- **Q:** Will this affect my compile times?
+
+  **A:** Likely not by anything perceivable. If this is a concern, this library
+  can be put in `dev-dependencies`:
+
+  ```toml
+  [dev-dependencies]
+  static_assertions = "1.1.0"
+  ```
+
+  and then assertions can be conditionally run behind `#[cfg(test)]`:
+
+  ```rust
+  #[cfg(test)]
+  const_assert_eq!(MEANING_OF_LIFE, 42);
+  ```
+
+  However, the assertions will only be checked when running `cargo test`. This
+  somewhat defeats the purpose of catching false static conditions up-front with
+  a compilation failure.
+
+- **Q:** What is `const _`?
+
+  **A:** It's a way of creating an unnamed constant. This is used so that macros
+  can be called from a global scope without requiring a scope-unique label. This
+  library makes use of the side effects of evaluating the `const` expression.
+  See the feature's
+  [tracking issue](https://github.com/rust-lang/rust/issues/54912)
+  and
+  [issue #1](https://github.com/nvzqz/static-assertions-rs/issues/1)
+  for more info.
+
+## Changes
+
+See [`CHANGELOG.md`](https://github.com/nvzqz/static-assertions-rs/blob/master/CHANGELOG.md)
+for a complete list of what has changed from one version to another.
+
+## License
+
+This project is released under either:
+
+- [MIT License](https://github.com/nvzqz/static-assertions-rs/blob/master/LICENSE-MIT)
+
+- [Apache License (Version 2.0)](https://github.com/nvzqz/static-assertions-rs/blob/master/LICENSE-APACHE)
+
+at your choosing.
+
+[new issue]:    https://github.com/nvzqz/static-assertions-rs/issues/new
+[pull request]: https://github.com/nvzqz/static-assertions-rs/pulls
+[docs]:         https://docs.rs/static_assertions
+
+[`assert_cfg!`]:             https://docs.rs/static_assertions/1.1.0/static_assertions/macro.assert_cfg.html
+[`assert_eq_align!`]:        https://docs.rs/static_assertions/1.1.0/static_assertions/macro.assert_eq_align.html
+[`assert_eq_size!`]:         https://docs.rs/static_assertions/1.1.0/static_assertions/macro.assert_eq_size.html
+[`assert_eq_size_ptr!`]:     https://docs.rs/static_assertions/1.1.0/static_assertions/macro.assert_eq_size_ptr.html
+[`assert_eq_size_val!`]:     https://docs.rs/static_assertions/1.1.0/static_assertions/macro.assert_eq_size_val.html
+[`assert_fields!`]:          https://docs.rs/static_assertions/1.1.0/static_assertions/macro.assert_fields.html
+[`assert_impl_all!`]:        https://docs.rs/static_assertions/1.1.0/static_assertions/macro.assert_impl_all.html
+[`assert_impl_any!`]:        https://docs.rs/static_assertions/1.1.0/static_assertions/macro.assert_impl_any.html
+[`assert_impl_one!`]:        https://docs.rs/static_assertions/1.1.0/static_assertions/macro.assert_impl_one.html
+[`assert_not_impl_all!`]:    https://docs.rs/static_assertions/1.1.0/static_assertions/macro.assert_not_impl_all.html
+[`assert_not_impl_any!`]:    https://docs.rs/static_assertions/1.1.0/static_assertions/macro.assert_not_impl_any.html
+[`assert_obj_safe!`]:        https://docs.rs/static_assertions/1.1.0/static_assertions/macro.assert_obj_safe.html
+[`assert_trait_sub_all!`]:   https://docs.rs/static_assertions/1.1.0/static_assertions/macro.assert_trait_sub_all.html
+[`assert_trait_super_all!`]: https://docs.rs/static_assertions/1.1.0/static_assertions/macro.assert_trait_super_all.html
+[`assert_type_eq_all!`]:     https://docs.rs/static_assertions/1.1.0/static_assertions/macro.assert_type_eq_all.html
+[`assert_type_ne_all!`]:     https://docs.rs/static_assertions/1.1.0/static_assertions/macro.assert_type_ne_all.html
+[`const_assert!`]:           https://docs.rs/static_assertions/1.1.0/static_assertions/macro.const_assert.html
+[`const_assert_eq!`]:        https://docs.rs/static_assertions/1.1.0/static_assertions/macro.const_assert_eq.html
+[`const_assert_ne!`]:        https://docs.rs/static_assertions/1.1.0/static_assertions/macro.const_assert_ne.html
diff --git a/proc/Cargo.toml b/proc/Cargo.toml
new file mode 100644
index 0000000..d1f7d69
--- /dev/null
+++ b/proc/Cargo.toml
@@ -0,0 +1,25 @@
+[package]
+name = "proc_static_assertions"
+version = "0.0.0"
+authors = ["Nikolai Vazquez"]
+license = "MIT OR Apache-2.0"
+readme = "../README.md"
+homepage = "https://github.com/nvzqz/static-assertions-rs"
+repository = "https://github.com/nvzqz/static-assertions-rs"
+documentation = "https://docs.rs/proc_static_assertions/"
+categories = ["no-std", "rust-patterns", "development-tools::testing"]
+keywords = ["assert", "static", "testing"]
+description = "Compile-time assertions via procedural macros."
+include = ["Cargo.toml", "src/**/*.rs", "README.md", "CHANGELOG.md", "LICENSE*"]
+
+[lib]
+proc-macro = true
+
+[badges]
+travis-ci = { repository = "nvzqz/static-assertions-rs" }
+is-it-maintained-open-issues = { repository = "nvzqz/static-assertions-rs" }
+is-it-maintained-issue-resolution = { repository = "nvzqz/static-assertions-rs" }
+maintenance = { status = "passively-maintained" }
+
+[features]
+nightly = []
diff --git a/proc/src/lib.rs b/proc/src/lib.rs
new file mode 100644
index 0000000..4812c3c
--- /dev/null
+++ b/proc/src/lib.rs
@@ -0,0 +1,92 @@
+//! [![Banner](https://raw.githubusercontent.com/nvzqz/static-assertions-rs/assets/Banner.png)](https://github.com/nvzqz/static-assertions-rs)
+//!
+//! <div align="center">
+//!     <a href="https://crates.io/crates/proc_static_assertions">
+//!         <img src="https://img.shields.io/crates/d/proc_static_assertions.svg" alt="Downloads">
+//!     </a>
+//!     <a href="https://travis-ci.org/nvzqz/static-assertions-rs">
+//!         <img src="https://travis-ci.org/nvzqz/static-assertions-rs.svg?branch=master" alt="Build Status">
+//!     </a>
+//!     <br><br>
+//! </div>
+//!
+//! Procedural macro [compile-time] assertions as an extension of
+//! [`static_assertions`].
+//!
+//! # Usage
+//!
+//! There's two main ways of using this crate: as a direct dependency or
+//! indirect dependency (via [`static_assertions`]).
+//!
+//! ## Direct Dependency
+//!
+//! This crate is available [on crates.io][crate] and can be used by adding the
+//! following to your project's [`Cargo.toml`]:
+//!
+//! ```toml
+//! [dependencies]
+//! proc_static_assertions = "0.0.0"
+//! ```
+//!
+//! and this to your crate root (`main.rs` or `lib.rs`):
+//!
+//! ```
+//! #[macro_use]
+//! extern crate proc_static_assertions;
+//! # fn main() {}
+//! ```
+//!
+//! ## Indirect Dependency
+//!
+//! Add the following to your project's [`Cargo.toml`]:
+//!
+//! ```toml
+//! [dependencies]
+//! static_assertions = { version = "1.1.0", features = ["proc"] }
+//! ```
+//!
+//! and this to your crate root (`main.rs` or `lib.rs`):
+//!
+//! ```ignore
+//! #[macro_use]
+//! extern crate static_assertions;
+//! ```
+//!
+//! This will also import all macros in `proc_static_assertions`.
+//!
+//! # Donate
+//!
+//! This project is made freely available (as in free beer), but unfortunately
+//! not all beer is free! So, if you would like to buy me a beer (or coffee or
+//! *more*), then consider supporting my work that's benefited your project
+//! and thousands of others.
+//!
+//! <a href="https://www.patreon.com/nvzqz">
+//!     <img src="https://c5.patreon.com/external/logo/become_a_patron_button.png" alt="Become a Patron!" height="35">
+//! </a>
+//! <a href="https://www.paypal.me/nvzqz">
+//!     <img src="https://buymecoffee.intm.org/img/button-paypal-white.png" alt="Buy me a coffee" height="35">
+//! </a>
+//!
+//! [`static_assertions`]: https://github.com/nvzqz/static-assertions-rs
+//! [crate]: https://crates.io/crates/static_assertions
+//! [`Cargo.toml`]: https://doc.rust-lang.org/cargo/reference/manifest.html
+//! [compile-time]: https://en.wikipedia.org/wiki/Compile_time
+
+#![doc(html_root_url = "https://docs.rs/proc_static_assertions/0.0.0")]
+#![doc(
+    html_logo_url = "https://raw.githubusercontent.com/nvzqz/static-assertions-rs/assets/Icon.png"
+)]
+#![deny(missing_docs)]
+
+extern crate proc_macro;
+use proc_macro::TokenStream;
+
+/// Statically assert aspects of types, traits, and more.
+///
+/// This currently does nothing. Create an issue if you have ideas for what this
+/// could do!
+#[proc_macro_attribute]
+pub fn assert(_attr: TokenStream, _item: TokenStream) -> TokenStream {
+    TokenStream::new()
+}
diff --git a/proc/tests/size.rs b/proc/tests/size.rs
new file mode 100644
index 0000000..1550547
--- /dev/null
+++ b/proc/tests/size.rs
@@ -0,0 +1,7 @@
+#[macro_use]
+extern crate proc_static_assertions;
+
+#[assert(size == 4, align == 4)]
+struct Foo {
+    value: i32,
+}
diff --git a/rustfmt.toml b/rustfmt.toml
new file mode 100644
index 0000000..c9cc71a
--- /dev/null
+++ b/rustfmt.toml
@@ -0,0 +1,15 @@
+max_width = 80
+hard_tabs = false
+tab_spaces = 4
+newline_style = "Unix"
+use_small_heuristics = "Default"
+reorder_imports = true
+reorder_modules = true
+remove_nested_parens = true
+fn_args_layout = "Tall"
+edition = "2018"
+merge_derives = true
+use_try_shorthand = false
+use_field_init_shorthand = true
+force_explicit_abi = true
+print_misformatted_file_names = true
diff --git a/src/assert_align.rs b/src/assert_align.rs
new file mode 100644
index 0000000..f1de642
--- /dev/null
+++ b/src/assert_align.rs
@@ -0,0 +1,200 @@
+/// Asserts that the types' alignments are equal.
+///
+/// This is useful when ensuring that pointer arithmetic is done correctly, or
+/// when [FFI] requires a type to have the same alignment as some foreign type.
+///
+/// # Examples
+///
+/// A `usize` has the same alignment as any pointer type:
+///
+/// ```
+/// # #[macro_use] extern crate static_assertions; fn main() {}
+/// assert_align_eq!(usize, *const u8, *mut u8);
+/// ```
+///
+/// The following passes because `[i32; 4]` has the same alignment as `i32`:
+///
+/// ```
+/// # #[macro_use] extern crate static_assertions; fn main() {}
+/// assert_align_eq!([i32; 4], i32);
+/// ```
+///
+/// The following example fails to compile because `i32x4` explicitly has 4
+/// times the alignment as `[i32; 4]`:
+///
+/// ```compile_fail
+/// # #[macro_use] extern crate static_assertions; fn main() {}
+/// # #[allow(non_camel_case_types)]
+/// #[repr(align(16))]
+/// struct i32x4([i32; 4]);
+///
+/// assert_align_eq!(i32x4, [i32; 4]);
+/// ```
+///
+/// [FFI]: https://en.wikipedia.org/wiki/Foreign_function_interface
+#[macro_export(local_inner_macros)]
+macro_rules! assert_align_eq {
+    ($x:ty, $($y:ty),+ $(,)?) => {
+        const _: fn() = || {
+            use $crate::_core::mem::align_of;
+            const_assert_eq_usize!(align_of::<$x>() $(, align_of::<$y>())+);
+        };
+    };
+}
+
+/// Asserts that the types' alignments are equal.
+///
+/// This macro has been deprecated in favor of
+/// [`assert_align_eq!`](macro.assert_align_eq.html).
+#[deprecated(
+    since = "1.2.0",
+    note = "Please use the 'assert_align_eq' macro instead"
+)]
+#[macro_export(local_inner_macros)]
+macro_rules! assert_eq_align {
+    ($($t:tt)*) => {
+        assert_align_eq!($($t)*);
+    };
+}
+
+/// Asserts that the types' alignments are **not** equal.
+///
+/// # Examples
+///
+/// A `u8` does not have the same alignment as a pointer:
+///
+/// ```
+/// # #[macro_use] extern crate static_assertions; fn main() {}
+/// assert_align_ne!(u8, *const u8);
+/// ```
+///
+/// The following example fails to compile because a `usize` has the same
+/// alignment as a pointer:
+///
+/// ```compile_fail
+/// # #[macro_use] extern crate static_assertions; fn main() {}
+/// assert_align_ne!(*const u8, usize);
+/// ```
+#[macro_export(local_inner_macros)]
+macro_rules! assert_align_ne {
+    ($x:ty, $($y:ty),+ $(,)?) => {
+        const _: fn() = || {
+            use $crate::_core::mem::align_of;
+            const_assert_ne!(align_of::<$x>() $(, align_of::<$y>())+);
+        };
+    };
+}
+
+/// Asserts that the types' alignments are less than each other.
+///
+/// # Examples
+///
+/// A `u8` has smaller alignment than `u16`, which has smaller alignment than
+/// a pointer:
+///
+/// ```
+/// # #[macro_use] extern crate static_assertions; fn main() {}
+/// assert_align_lt!(u8, u16, *const u8);
+/// ```
+///
+/// The following example fails to compile because a `usize` has the same
+/// alignment as a pointer:
+///
+/// ```compile_fail
+/// # #[macro_use] extern crate static_assertions; fn main() {}
+/// assert_align_lt!(*const u8, usize);
+/// ```
+#[macro_export(local_inner_macros)]
+macro_rules! assert_align_lt {
+    ($x:ty, $($y:ty),+ $(,)?) => {
+        const _: fn() = || {
+            use $crate::_core::mem::align_of;
+            const_assert_lt!(align_of::<$x>() $(, align_of::<$y>())+);
+        };
+    };
+}
+
+/// Asserts that the types' alignments are less than or equal to each other.
+///
+/// # Examples
+///
+/// A `u8` and `i8` have smaller alignment than any pointer type:
+///
+/// ```
+/// # #[macro_use] extern crate static_assertions; fn main() {}
+/// assert_align_le!(u8, i8, *const u8);
+/// ```
+///
+/// The following example fails to compile because a `usize` has greater
+/// alignment than `u8`:
+///
+/// ```compile_fail
+/// # #[macro_use] extern crate static_assertions; fn main() {}
+/// assert_align_le!(usize, u8);
+/// ```
+#[macro_export(local_inner_macros)]
+macro_rules! assert_align_le {
+    ($x:ty, $($y:ty),+ $(,)?) => {
+        const _: fn() = || {
+            use $crate::_core::mem::align_of;
+            const_assert_le!(align_of::<$x>() $(, align_of::<$y>())+);
+        };
+    };
+}
+
+/// Asserts that the types' alignments are greater than each other.
+///
+/// # Examples
+///
+/// A pointer has greater alignment than `u16`, which has greater alignment than
+/// `u8`:
+///
+/// ```
+/// # #[macro_use] extern crate static_assertions; fn main() {}
+/// assert_align_gt!(*const u8, u16, u8);
+/// ```
+///
+/// The following example fails to compile because a `usize` has the same
+/// alignment as a pointer:
+///
+/// ```compile_fail
+/// # #[macro_use] extern crate static_assertions; fn main() {}
+/// assert_align_gt!(*const u8, usize);
+/// ```
+#[macro_export(local_inner_macros)]
+macro_rules! assert_align_gt {
+    ($x:ty, $($y:ty),+ $(,)?) => {
+        const _: fn() = || {
+            use $crate::_core::mem::align_of;
+            const_assert_gt!(align_of::<$x>() $(, align_of::<$y>())+);
+        };
+    };
+}
+
+/// Asserts that the types' alignments are greater than or equal to each other.
+///
+/// # Examples
+///
+/// A pointer has greater alignment than `u8` and `i8`:
+///
+/// ```
+/// # #[macro_use] extern crate static_assertions; fn main() {}
+/// assert_align_ge!(*const u8, u8, i8);
+/// ```
+///
+/// The following example fails to compile because a `u8` has smaller alignment
+/// than `usize`:
+///
+/// ```compile_fail
+/// # #[macro_use] extern crate static_assertions; fn main() {}
+/// assert_align_ge!(u8, usize);
+/// ```
+#[macro_export(local_inner_macros)]
+macro_rules! assert_align_ge {
+    ($x:ty, $($y:ty),+ $(,)?) => {
+        const _: fn() = || {
+            use $crate::_core::mem::align_of;
+            const_assert_ge!(align_of::<$x>() $(, align_of::<$y>())+);
+        };
+    };
+}
diff --git a/src/assert_cfg.rs b/src/assert_cfg.rs
new file mode 100644
index 0000000..24282c1
--- /dev/null
+++ b/src/assert_cfg.rs
@@ -0,0 +1,49 @@
+/// Asserts that a given configuration is set.
+///
+/// # Examples
+///
+/// A project will simply fail to compile if the given configuration is not set.
+///
+/// ```
+/// # #[macro_use] extern crate static_assertions; fn main() {}
+/// // We're not masochists
+/// # #[cfg(not(target_pointer_width = "16"))] // Just in case
+/// assert_cfg!(not(target_pointer_width = "16"));
+/// ```
+///
+/// If a project does not support a set of configurations, you may want to
+/// report why. There is the option of providing a compile error message string:
+///
+/// ```
+/// # #[macro_use] extern crate static_assertions; fn main() {}
+/// # #[cfg(any(unix, windows))]
+/// assert_cfg!(any(unix, windows), "There is only support for Unix or Windows");
+///
+/// // User needs to specify a database back-end
+/// # #[cfg(target_pointer_width = "0")] // Impossible
+/// assert_cfg!(all(not(all(feature = "mysql", feature = "mongodb")),
+///                 any(    feature = "mysql", feature = "mongodb")),
+///             "Must exclusively use MySQL or MongoDB as database back-end");
+/// ```
+///
+/// Some configurations are impossible. For example, we can't be compiling for
+/// both macOS _and_ Windows simultaneously:
+///
+/// ```compile_fail
+/// # #[macro_use] extern crate static_assertions; fn main() {}
+/// assert_cfg!(all(target_os = "macos",
+///                 target_os = "windows"),
+///             "No, that's not how it works! ಠ_ಠ");
+/// ```
+#[macro_export]
+macro_rules! assert_cfg {
+    () => {};
+    ($($cfg:meta)+, $msg:expr $(,)?) => {
+        #[cfg(not($($cfg)+))]
+        compile_error!($msg);
+    };
+    ($($cfg:tt)*) => {
+        #[cfg(not($($cfg)*))]
+        compile_error!(concat!("Cfg does not pass: ", stringify!($($cfg)*)));
+    };
+}
diff --git a/src/assert_fields.rs b/src/assert_fields.rs
new file mode 100644
index 0000000..00f6242
--- /dev/null
+++ b/src/assert_fields.rs
@@ -0,0 +1,72 @@
+/// Asserts that the type has the given fields.
+///
+/// # Examples
+///
+/// One common use case is when types have fields defined multiple times as a
+/// result of `#[cfg]`. This can be an issue when exposing a public API.
+///
+/// ```
+/// # #[macro_use] extern crate static_assertions;
+/// pub struct Ty {
+///     #[cfg(windows)]
+///     pub val1: u8,
+///     #[cfg(not(windows))]
+///     pub val1: usize,
+///
+///     #[cfg(unix)]
+///     pub val2: u32,
+///     #[cfg(not(unix))]
+///     pub val2: usize,
+/// }
+///
+/// // Always have `val2` regardless of OS
+/// assert_fields!(Ty: val2);
+/// ```
+///
+/// This macro even works with `enum` variants:
+///
+/// ```
+/// # #[macro_use] extern crate static_assertions; fn main() {}
+/// enum Data {
+///     Val {
+///         id: i32,
+///         name: String,
+///         bytes: [u8; 128],
+///     },
+///     Ptr(*const u8),
+/// }
+///
+/// assert_fields!(Data::Val: id, bytes);
+/// ```
+///
+/// The following example fails to compile because [`Range`] does not have a field named `middle`:
+///
+/// ```compile_fail
+/// # #[macro_use] extern crate static_assertions; fn main() {}
+/// use std::ops::Range;
+///
+/// assert_fields!(Range<u32>: middle);
+/// ```
+///
+/// [`Range`]: https://doc.rust-lang.org/std/ops/struct.Range.html
+#[macro_export]
+macro_rules! assert_fields {
+    ($t:ident::$v:ident: $($f:ident),+) => {
+        #[allow(unknown_lints, unneeded_field_pattern)]
+        const _: fn() = || {
+            #[allow(dead_code, unreachable_patterns)]
+            fn assert(value: $t) {
+                match value {
+                    $($t::$v { $f: _, .. } => {},)+
+                    _ => {}
+                }
+            }
+        };
+    };
+    ($t:path: $($f:ident),+) => {
+        #[allow(unknown_lints, unneeded_field_pattern)]
+        const _: fn() = || {
+            $(let $t { $f: _, .. };)+
+        };
+    };
+}
diff --git a/src/assert_impl.rs b/src/assert_impl.rs
new file mode 100644
index 0000000..83545ca
--- /dev/null
+++ b/src/assert_impl.rs
@@ -0,0 +1,385 @@
+/// Asserts that the type implements exactly one in a set of traits.
+///
+/// Related:
+/// - [`assert_impl_any!`]
+/// - [`assert_impl_all!`]
+/// - [`assert_impl_not_all!`]
+/// - [`assert_impl_not_any!`]
+///
+/// # Examples
+///
+/// Given some type `Foo`, it is expected to implement either `Snap`, `Crackle`,
+/// or `Pop`:
+///
+/// ```compile_fail
+/// # use static_assertions::assert_impl_one; fn main() {}
+/// struct Foo;
+///
+/// trait Snap {}
+/// trait Crackle {}
+/// trait Pop {}
+///
+/// assert_impl_one!(Foo: Snap, Crackle, Pop);
+/// ```
+///
+/// If _only_ `Crackle` is implemented, the assertion passes:
+///
+/// ```
+/// # use static_assertions::assert_impl_one; fn main() {}
+/// # struct Foo;
+/// # trait Snap {}
+/// # trait Crackle {}
+/// # trait Pop {}
+/// impl Crackle for Foo {}
+///
+/// assert_impl_one!(Foo: Snap, Crackle, Pop);
+/// ```
+///
+/// If `Snap` or `Pop` is _also_ implemented, the assertion fails:
+///
+/// ```compile_fail
+/// # use static_assertions::assert_impl_one; fn main() {}
+/// # struct Foo;
+/// # trait Snap {}
+/// # trait Crackle {}
+/// # trait Pop {}
+/// # impl Crackle for Foo {}
+/// impl Pop for Foo {}
+///
+/// assert_impl_one!(Foo: Snap, Crackle, Pop);
+/// ```
+///
+/// [`assert_impl_any!`]:     macro.assert_impl_any.html
+/// [`assert_impl_all!`]:     macro.assert_impl_all.html
+/// [`assert_impl_not_all!`]: macro.assert_not_impl_all.html
+/// [`assert_impl_not_any!`]: macro.assert_not_impl_any.html
+#[macro_export]
+macro_rules! assert_impl_one {
+    ($x:ty: $($t:path),+ $(,)?) => {
+        const _: fn() = || {
+            // Generic trait that must be implemented for `$x` exactly once.
+            trait AmbiguousIfMoreThanOne<A> {
+                // Required for actually being able to reference the trait.
+                fn some_item() {}
+            }
+
+            // Creates multiple scoped `Token` types for each trait `$t`, over
+            // which a specialized `AmbiguousIfMoreThanOne<Token>` is
+            // implemented for every type that implements `$t`.
+            $({
+                #[allow(dead_code)]
+                struct Token;
+
+                impl<T: ?Sized + $t> AmbiguousIfMoreThanOne<Token> for T {}
+            })+
+
+            // If there is only one specialized trait impl, type inference with
+            // `_` can be resolved and this can compile. Fails to compile if
+            // `$x` implements more than one `AmbiguousIfMoreThanOne<Token>` or
+            // does not implement any at all.
+            let _ = <$x as AmbiguousIfMoreThanOne<_>>::some_item;
+        };
+    };
+}
+
+/// Asserts that the type implements _all_ of the given traits.
+///
+/// See [`assert_impl_not_all!`] for achieving the opposite effect.
+///
+/// # Examples
+///
+/// This can be used to ensure types implement auto traits such as [`Send`] and
+/// [`Sync`], as well as traits with [blanket `impl`s][blanket].
+///
+/// ```
+/// # #[macro_use] extern crate static_assertions; fn main() {}
+/// assert_impl_all!(u32: Copy, Send);
+/// assert_impl_all!(&str: Into<String>);
+/// ```
+///
+/// The following example fails to compile because raw pointers do not implement
+/// [`Send`] since they cannot be moved between threads safely:
+///
+/// ```compile_fail
+/// # #[macro_use] extern crate static_assertions; fn main() {}
+/// assert_impl_all!(*const u8: Send);
+/// ```
+///
+/// [`assert_impl_not_all!`]: macro.assert_not_impl_all.html
+/// [`Send`]: https://doc.rust-lang.org/std/marker/trait.Send.html
+/// [`Sync`]: https://doc.rust-lang.org/std/marker/trait.Sync.html
+/// [blanket]: https://doc.rust-lang.org/book/ch10-02-traits.html#using-trait-bounds-to-conditionally-implement-methods
+#[macro_export(local_inner_macros)]
+macro_rules! assert_impl_all {
+    ($ty:ty: $($traits:path),+ $(,)?) => {
+        assert_impl!($ty: $( ($traits) )&+);
+    };
+}
+
+/// Asserts that the type implements _any_ of the given traits.
+///
+/// See [`assert_impl_not_any!`] for achieving the opposite effect.
+///
+/// # Examples
+///
+/// `u8` cannot be converted from `u16`, but it can be converted into `u16`:
+///
+/// ```
+/// # #[macro_use] extern crate static_assertions; fn main() {}
+/// assert_impl_any!(u8: From<u16>, Into<u16>);
+/// ```
+///
+/// The unit type cannot be converted from `u8` or `u16`, but it does implement
+/// [`Send`]:
+///
+/// ```
+/// # #[macro_use] extern crate static_assertions; fn main() {}
+/// assert_impl_any!((): From<u8>, From<u16>, Send);
+/// ```
+///
+/// The following example fails to compile because raw pointers do not implement
+/// [`Send`] or [`Sync`] since they cannot be moved or shared between threads
+/// safely:
+///
+/// ```compile_fail
+/// # #[macro_use] extern crate static_assertions; fn main() {}
+/// assert_impl_any!(*const u8: Send, Sync);
+/// ```
+///
+/// [`assert_impl_not_any!`]: macro.assert_not_impl_any.html
+/// [`Send`]: https://doc.rust-lang.org/std/marker/trait.Send.html
+/// [`Sync`]: https://doc.rust-lang.org/std/marker/trait.Sync.html
+#[macro_export(local_inner_macros)]
+macro_rules! assert_impl_any {
+    ($ty:ty: $($traits:path),+ $(,)?) => {
+        assert_impl!($ty: $( ($traits) )|+);
+    };
+}
+
+/// Asserts that the type does **not** implement _all_ of the given traits.
+///
+/// This can be used to ensure types do not implement auto traits such as
+/// [`Send`] and [`Sync`], as well as traits with [blanket `impl`s][blanket].
+///
+/// Note that the combination of all provided traits is required to not be
+/// implemented. If you want to check that none of multiple traits are
+/// implemented you should invoke [`assert_impl_not_any!`] instead.
+///
+/// # Examples
+///
+/// Although `u32` implements `From<u16>`, it does not implement `Into<usize>`:
+///
+/// ```
+/// # #[macro_use] extern crate static_assertions; fn main() {}
+/// assert_impl_not_all!(u32: From<u16>, Into<usize>);
+/// ```
+///
+/// The following example fails to compile since `u32` can be converted into
+/// `u64`.
+///
+/// ```compile_fail
+/// # #[macro_use] extern crate static_assertions; fn main() {}
+/// assert_impl_not_all!(u32: Into<u64>);
+/// ```
+///
+/// The following compiles because [`Cell`] is not both [`Sync`] _and_ [`Send`]:
+///
+/// ```
+/// # #[macro_use] extern crate static_assertions; fn main() {}
+/// use std::cell::Cell;
+///
+/// assert_impl_not_all!(Cell<u32>: Sync, Send);
+/// ```
+///
+/// But it is [`Send`], so this fails to compile:
+///
+/// ```compile_fail
+/// # #[macro_use] extern crate static_assertions; fn main() {}
+/// # std::cell::Cell;
+/// assert_impl_not_all!(Cell<u32>: Send);
+/// ```
+///
+/// [`Send`]: https://doc.rust-lang.org/std/marker/trait.Send.html
+/// [`Sync`]: https://doc.rust-lang.org/std/marker/trait.Sync.html
+/// [`assert_impl_not_any!`]: macro.assert_impl_not_any.html
+/// [`Cell`]: https://doc.rust-lang.org/std/cell/struct.Cell.html
+/// [blanket]: https://doc.rust-lang.org/book/ch10-02-traits.html#using-trait-bounds-to-conditionally-implement-methods
+#[macro_export(local_inner_macros)]
+macro_rules! assert_impl_not_all {
+    ($ty:ty: $($traits:path),+ $(,)?) => {
+        assert_impl!($ty: !( $( ($traits) )&+ ));
+    };
+}
+
+/// Asserts that the type does **not** implement _all_ of the given traits.
+///
+/// This macro has been deprecated in favor of
+/// [`assert_impl_not_all!`](macro.assert_impl_not_all.html).
+#[deprecated(
+    since = "1.2.0",
+    note = "Please use the 'assert_impl_not_all' macro instead"
+)]
+#[macro_export(local_inner_macros)]
+macro_rules! assert_not_impl_all {
+    ($($t:tt)*) => {
+        assert_impl_not_all!($($t)*);
+    };
+}
+
+/// Asserts that the type does **not** implement _any_ of the given traits.
+///
+/// This can be used to ensure types do not implement auto traits such as
+/// [`Send`] and [`Sync`], as well as traits with [blanket `impl`s][blanket].
+///
+/// This macro causes a compilation failure if any of the provided individual
+/// traits are implemented for the type. If you want to check that a combination
+/// of traits is not implemented you should invoke [`assert_impl_not_all!`]
+/// instead. For single traits both macros behave the same.
+///
+/// # Examples
+///
+/// If `u32` were to implement `Into` conversions for `usize` _and_ for `u8`,
+/// the following would fail to compile:
+///
+/// ```
+/// # #[macro_use] extern crate static_assertions; fn main() {}
+/// assert_impl_not_any!(u32: Into<usize>, Into<u8>);
+/// ```
+///
+/// This is also good for simple one-off cases:
+///
+/// ```
+/// # #[macro_use] extern crate static_assertions; fn main() {}
+/// assert_impl_not_any!(&'static mut u8: Copy);
+/// ```
+///
+/// The following example fails to compile since `u32` can be converted into
+/// `u64` even though it can not be converted into a `u16`:
+///
+/// ```compile_fail
+/// # #[macro_use] extern crate static_assertions; fn main() {}
+/// assert_impl_not_any!(u32: Into<u64>, Into<u16>);
+/// ```
+///
+/// [`Send`]: https://doc.rust-lang.org/std/marker/trait.Send.html
+/// [`Sync`]: https://doc.rust-lang.org/std/marker/trait.Sync.html
+/// [`assert_impl_not_all!`]: macro.assert_impl_not_all.html
+/// [blanket]: https://doc.rust-lang.org/book/ch10-02-traits.html#using-trait-bounds-to-conditionally-implement-methods
+#[macro_export(local_inner_macros)]
+macro_rules! assert_impl_not_any {
+    ($ty:ty: $($traits:path),+ $(,)?) => {
+        assert_impl!($ty: !( $( ($traits) )|+ ));
+    };
+}
+
+/// Asserts that the type does **not** implement _any_ of the given traits.
+///
+/// This macro has been deprecated in favor of
+/// [`assert_impl_not_any!`](macro.assert_impl_not_any.html).
+#[deprecated(
+    since = "1.2.0",
+    note = "Please use the 'assert_impl_not_any' macro instead"
+)]
+#[macro_export(local_inner_macros)]
+macro_rules! assert_not_impl_any {
+    ($($t:tt)*) => {
+        assert_impl_not_any!($($t)*);
+    };
+}
+
+/// Asserts that the type implements a logical trait expression.
+///
+/// This macro causes a compilation failure if the expression is not satisfied.
+///
+/// See [`does_impl!`](macro.does_impl.html) for simply getting a [`bool`] from
+/// this condition without asserting it.
+///
+/// # Syntax
+///
+/// ```skip
+/// assert_impl!(<type>: <trait_expr>);
+/// assert_impl!(for(<type>: <bounds>) <type>: <trait_expr>);
+/// ```
+///
+/// where:
+///
+/// - `<type>` is a type (that must not depend on a generic parameter)
+///
+/// - `<trait_expr>` is an expression made out of trait names, combined with `!`
+///   for negation, `&` for conjunction, `|` for disjunction and parentheses for
+///   grouping.
+///
+/// - `<bounds>` is a trait bounds expression.
+///
+/// For technical reasons:
+///
+/// - Traits (like `Into<u8>`) that are not a single identifier must be
+///   surrounded by parentheses.
+///
+/// - The usual operator priority is not respected: `x & y | z` is parsed as
+///   `x & (y | z)`.
+///
+/// # Examples
+///
+/// If `u32` were to implement `Into` conversions for `usize` _and_ for `u8`,
+/// the following would fail to compile:
+///
+/// ```
+/// # #[macro_use] extern crate static_assertions; fn main() {}
+/// assert_impl!(u32: !((Into<usize>) & (Into<u8>)));
+/// ```
+///
+/// Check that a type is [`Send`] but not [`Sync`].
+///
+/// ```
+/// # #[macro_use] extern crate static_assertions; fn main() {}
+/// use std::cell::Cell;
+///
+/// assert_impl!(Cell<u32>: Send & !Sync);
+/// ```
+///
+/// Check simple one-off cases:
+///
+/// ```
+/// # #[macro_use] extern crate static_assertions; fn main() {}
+/// assert_impl!(&'static mut u8: !Copy);
+/// ```
+///
+/// Check that a type is _always_ [`Clone`] even when its parameter isn't:
+///
+/// ```
+/// # #[macro_use] extern crate static_assertions; fn main() {}
+/// use std::rc::Rc;
+///
+/// assert_impl!(for(T) Rc<T>: Clone);
+/// ```
+///
+/// The following example fails to compile since `u64` cannot be converted into
+/// either `u32` or `u16`:
+///
+/// ```compile_fail
+/// # #[macro_use] extern crate static_assertions; fn main() {}
+/// assert_impl!(u64: (Into<u32>) | (Into<u16>));
+/// ```
+///
+/// [`bool`]: https://doc.rust-lang.org/std/primitive.bool.html
+/// [`Send`]: https://doc.rust-lang.org/std/marker/trait.Send.html
+/// [`Sync`]: https://doc.rust-lang.org/std/marker/trait.Sync.html
+/// [`Clone`]: https://doc.rust-lang.org/std/clone/trait.Clone.html
+#[macro_export(local_inner_macros)]
+macro_rules! assert_impl {
+    (for($($generic:tt)*) $ty:ty: $($rest:tt)*) => {
+        const _: () = {
+            fn assert_impl<$($generic)*>() {
+                // Construct an expression using `True`/`False` and their
+                // operators, that corresponds to the provided expression.
+                let _: $crate::True = $crate::_does_impl!($ty: $($rest)*);
+            }
+        };
+    };
+    ($ty:ty: $($rest:tt)*) => {
+        // Construct an expression using `True`/`False` and their operators,
+        // that corresponds to the provided expression.
+        const _: $crate::True = $crate::_does_impl!($ty: $($rest)*);
+    };
+}
diff --git a/src/assert_obj_safe.rs b/src/assert_obj_safe.rs
new file mode 100644
index 0000000..ecbba96
--- /dev/null
+++ b/src/assert_obj_safe.rs
@@ -0,0 +1,76 @@
+// FIXME: Link below is required to render in index
+/// Asserts that the traits support dynamic dispatch
+/// ([object-safety](https://doc.rust-lang.org/book/ch17-02-trait-objects.html#object-safety-is-required-for-trait-objects)).
+///
+/// This is useful for when changes are made to a trait that accidentally
+/// prevent it from being used as an [object]. Such a case would be adding a
+/// generic method and forgetting to add `where Self: Sized` after it. If left
+/// unnoticed, that mistake will affect crate users and break both forward and
+/// backward compatibility.
+///
+/// # Examples
+///
+/// When exposing a public API, it's important that traits that could previously
+/// use dynamic dispatch can still do so in future compatible crate versions.
+///
+/// ```
+/// # #[macro_use] extern crate static_assertions; fn main() {}
+/// trait MySafeTrait {
+///     fn foo(&self) -> u32;
+/// }
+///
+/// assert_obj_safe!(std::fmt::Write, MySafeTrait);
+/// ```
+///
+/// Works with traits that are not in the calling module:
+///
+/// ```
+/// # #[macro_use] extern crate static_assertions; fn main() {}
+/// mod inner {
+///     pub trait BasicTrait {
+///         fn bar(&self);
+///     }
+///     assert_obj_safe!(BasicTrait);
+/// }
+///
+/// assert_obj_safe!(inner::BasicTrait);
+/// ```
+///
+/// The following example fails to compile because raw pointers cannot be sent
+///  between threads safely:
+///
+/// ```compile_fail
+/// # #[macro_use] extern crate static_assertions; fn main() {}
+/// assert_impl!(*const u8, Send);
+/// ```
+///
+/// The following example fails to compile because generics without
+/// `where Self: Sized` are not allowed in [object-safe][object] trait methods:
+///
+/// ```compile_fail
+/// # #[macro_use] extern crate static_assertions; fn main() {}
+/// trait MyUnsafeTrait {
+///     fn baz<T>(&self) -> T;
+/// }
+///
+/// assert_obj_safe!(MyUnsafeTrait);
+/// ```
+///
+/// When we fix that, the previous code will compile:
+///
+/// ```
+/// # #[macro_use] extern crate static_assertions; fn main() {}
+/// trait MyUnsafeTrait {
+///     fn baz<T>(&self) -> T where Self: Sized;
+/// }
+///
+/// assert_obj_safe!(MyUnsafeTrait);
+/// ```
+///
+/// [object]: https://doc.rust-lang.org/book/ch17-02-trait-objects.html#object-safety-is-required-for-trait-objects
+#[macro_export]
+macro_rules! assert_obj_safe {
+    ($($xs:path),+ $(,)?) => {
+        $(const _: Option<&$xs> = None;)+
+    };
+}
diff --git a/src/assert_size.rs b/src/assert_size.rs
new file mode 100644
index 0000000..e1a7067
--- /dev/null
+++ b/src/assert_size.rs
@@ -0,0 +1,168 @@
+/// Asserts that types are equal in size.
+///
+/// When performing operations such as pointer casts or dealing with [`usize`]
+/// versus [`u64`] versus [`u32`], the size of your types matter. That is where
+/// this macro comes into play.
+///
+/// # Alternatives
+///
+/// There also exists [`assert_size_eq_val`](macro.assert_size_eq_val.html) and
+/// [`assert_size_eq_ptr`](macro.assert_size_eq_ptr.html). Instead of specifying
+/// types to compare, values' sizes can be directly compared against each other.
+///
+/// # Examples
+///
+/// These three types, despite being very different, all have the same size:
+///
+/// ```
+/// # #[macro_use] extern crate static_assertions; fn main() {}
+/// assert_size_eq!([u8; 4], (u16, u16), u32);
+/// ```
+///
+/// The following example fails to compile because `u32` has 4 times the size of
+/// `u8`:
+///
+/// ```compile_fail
+/// # #[macro_use] extern crate static_assertions; fn main() {}
+/// assert_size_eq!(u32, u8);
+/// ```
+///
+/// [`usize`]: https://doc.rust-lang.org/std/primitive.usize.html
+/// [`u64`]: https://doc.rust-lang.org/std/primitive.u64.html
+/// [`u32`]: https://doc.rust-lang.org/std/primitive.u32.html
+#[macro_export]
+macro_rules! assert_size_eq {
+    ($x:ty, $($xs:ty),+ $(,)?) => {
+        const _: fn() = || {
+            $(let _ = $crate::_core::mem::transmute::<$x, $xs>;)+
+        };
+    };
+}
+
+/// Asserts that types are equal in alignment.
+///
+/// This macro has been deprecated in favor of
+/// [`assert_size_eq!`](macro.assert_size_eq.html).
+#[deprecated(
+    since = "1.2.0",
+    note = "Please use the 'assert_size_eq' macro instead"
+)]
+#[macro_export(local_inner_macros)]
+macro_rules! assert_eq_size {
+    ($($t:tt)*) => {
+        assert_size_eq!($($t)*);
+    };
+}
+
+/// Asserts that values pointed to are equal in size.
+///
+/// # Examples
+///
+/// This especially is useful for when coercing pointers between different types
+/// and ensuring the underlying values are the same size.
+///
+/// ```
+/// # #[macro_use] extern crate static_assertions; fn main() {}
+/// fn operation(x: &(u32, u32), y: &[u16; 4]) {
+///     assert_size_eq_ptr!(x, y);
+///     // ...
+/// }
+/// ```
+///
+/// The following example fails to compile because byte arrays of different
+/// lengths have different sizes:
+///
+/// ```compile_fail
+/// # #[macro_use] extern crate static_assertions;
+/// # fn main() {
+/// static BYTES: &[u8; 4] = &[
+///     /* ... */
+///     # 0; 4
+/// ];
+///
+/// static TABLE: &[u8; 16] = &[
+///     /* ... */
+///     # 0; 16
+/// ];
+///
+/// assert_size_eq_ptr!(BYTES, TABLE);
+/// ```
+#[macro_export]
+macro_rules! assert_size_eq_ptr {
+    ($x:expr, $($xs:expr),+ $(,)?) => {
+        #[allow(unknown_lints, unsafe_code, forget_copy, useless_transmute)]
+        let _ = || unsafe {
+            use $crate::_core::{mem, ptr};
+            let mut copy = ptr::read($x);
+            $(ptr::write(&mut copy, mem::transmute(ptr::read($xs)));)+
+            mem::forget(copy);
+        };
+    }
+}
+
+/// Asserts that values pointed to are equal in size.
+///
+/// This macro has been deprecated in favor of
+/// [`assert_size_eq_ptr!`](macro.assert_size_eq_ptr.html).
+#[deprecated(
+    since = "1.2.0",
+    note = "Please use the 'assert_size_eq_ptr' macro instead"
+)]
+#[macro_export(local_inner_macros)]
+macro_rules! assert_eq_size_ptr {
+    ($($t:tt)*) => {
+        assert_size_eq_ptr!($($t)*);
+    };
+}
+
+/// Asserts that values are equal in size.
+///
+/// This macro doesn't consume its arguments and thus works for
+/// non-[`Clone`]able values.
+///
+/// # Examples
+///
+/// ```
+/// # #[macro_use] extern crate static_assertions;
+/// # fn main() {
+/// struct Byte(u8);
+///
+/// let x = 10u8;
+/// let y = Byte(42); // Works for non-cloneable types
+///
+/// assert_size_eq_val!(x, y);
+/// assert_size_eq_val!(x, y, 0u8);
+/// # }
+/// ```
+///
+/// Even though both values are 0, they are of types with different sizes:
+///
+/// ```compile_fail
+/// # #[macro_use] extern crate static_assertions;
+/// # fn main() {
+/// assert_size_eq_val!(0u8, 0u32);
+/// # }
+/// ```
+///
+/// [`Clone`]: https://doc.rust-lang.org/std/clone/trait.Clone.html
+#[macro_export(local_inner_macros)]
+macro_rules! assert_size_eq_val {
+    ($x:expr, $($xs:expr),+ $(,)?) => {
+        assert_size_eq_ptr!(&$x, $(&$xs),+);
+    }
+}
+
+/// Asserts that values pointed to are equal in size.
+///
+/// This macro has been deprecated in favor of
+/// [`assert_size_eq_val!`](macro.assert_size_eq_val.html).
+#[deprecated(
+    since = "1.2.0",
+    note = "Please use the 'assert_size_eq_val' macro instead"
+)]
+#[macro_export(local_inner_macros)]
+macro_rules! assert_eq_size_val {
+    ($($t:tt)*) => {
+        assert_size_eq_val!($($t)*);
+    };
+}
diff --git a/src/assert_trait.rs b/src/assert_trait.rs
new file mode 100644
index 0000000..5c87ce6
--- /dev/null
+++ b/src/assert_trait.rs
@@ -0,0 +1,139 @@
+/// Asserts that the trait is a child of all of the other traits.
+///
+/// Related:
+/// - [`assert_trait_super_all!`]
+///
+/// # Examples
+///
+/// All types that implement [`Copy`] must implement [`Clone`]:
+///
+/// ```
+/// # #[macro_use] extern crate static_assertions; fn main() {}
+/// assert_trait_sub_all!(Copy: Clone);
+/// ```
+///
+/// All types that implement [`Ord`] must implement [`PartialEq`], [`Eq`], and
+/// [`PartialOrd`]:
+///
+/// ```
+/// # #[macro_use] extern crate static_assertions; fn main() {}
+/// assert_trait_sub_all!(Ord: PartialEq, Eq, PartialOrd);
+/// ```
+///
+/// The following example fails to compile because [`Eq`] is not required for
+/// [`PartialOrd`]:
+///
+/// ```compile_fail
+/// # #[macro_use] extern crate static_assertions; fn main() {}
+/// assert_trait_sub_all!(PartialOrd: Eq);
+/// ```
+///
+/// [`assert_trait_super_all!`]: macro.assert_trait_super_all.html
+///
+/// [`Copy`]:       https://doc.rust-lang.org/std/marker/trait.Copy.html
+/// [`Clone`]:      https://doc.rust-lang.org/std/clone/trait.Clone.html
+/// [`Ord`]:        https://doc.rust-lang.org/std/cmp/trait.Ord.html
+/// [`PartialOrd`]: https://doc.rust-lang.org/std/cmp/trait.PartialOrd.html
+/// [`Eq`]:         https://doc.rust-lang.org/std/cmp/trait.Eq.html
+/// [`PartialEq`]:  https://doc.rust-lang.org/std/cmp/trait.PartialEq.html
+#[macro_export(local_inner_macros)]
+macro_rules! assert_trait_sub_all {
+    ($sub:path: $($super:path),+ $(,)?) => {
+        assert_impl!(for(T: $sub) T: $( ($super) )&+);
+    };
+}
+
+/// Asserts that the trait is a parent of all of the other traits.
+///
+/// Related:
+/// - [`assert_trait_sub_all!`]
+///
+/// # Examples
+///
+/// With this, traits `A` and `B` can both be tested to require [`Copy`] on a
+/// single line:
+///
+/// ```
+/// # use static_assertions::assert_trait_super_all;
+/// trait A: Copy {}
+/// trait B: Copy {}
+///
+/// assert_trait_super_all!(Copy: A, B);
+/// ```
+///
+/// Otherwise, each sub-trait would require its own call to
+/// [`assert_trait_sub_all!`]:
+///
+/// ```
+/// # #[macro_use] extern crate static_assertions; fn main() {}
+/// # trait A: Copy {}
+/// # trait B: Copy {}
+/// assert_trait_sub_all!(A: Copy);
+/// assert_trait_sub_all!(B: Copy);
+/// ```
+///
+/// The following example fails to compile because trait `C` does not require
+/// [`Copy`]:
+///
+/// ```compile_fail
+/// # use static_assertions::assert_trait_super_all;
+/// # trait A: Copy {}
+/// # trait B: Copy {}
+/// trait C {}
+///
+/// assert_trait_super_all!(Copy: A, B, C);
+/// ```
+///
+/// [`assert_trait_sub_all!`]: macro.assert_trait_sub_all.html
+///
+/// [`Copy`]: https://doc.rust-lang.org/std/marker/trait.Copy.html
+#[macro_export(local_inner_macros)]
+macro_rules! assert_trait_super_all {
+    ($super:path: $($sub:path),+ $(,)?) => {
+        $(assert_trait_sub_all!($sub: $super);)+
+    };
+}
+
+/// Asserts that the trait is a child of one or more of the other traits.
+///
+/// Related:
+/// - [`assert_impl_any!`]
+///
+/// # Examples
+///
+/// All types that implement [`Copy`] must implement [`Clone`]:
+///
+/// ```
+/// # #[macro_use] extern crate static_assertions; fn main() {}
+/// assert_trait_sub_any!(Copy: Clone);
+/// ```
+///
+/// All types that implement [`Ord`] must implement [`Eq`], but don't have to implement [`Clone`]:
+///
+/// ```
+/// # #[macro_use] extern crate static_assertions; fn main() {}
+/// assert_trait_sub_any!(Ord: Eq, Clone);
+/// ```
+///
+/// The following example fails to compile because neither [`Eq`] nor [`Clone`] are required for
+/// [`PartialOrd`]:
+///
+/// ```compile_fail
+/// # #[macro_use] extern crate static_assertions; fn main() {}
+/// assert_trait_sub_any!(PartialOrd: Eq, Clone);
+/// ```
+///
+/// [`assert_impl_any!`]: macro.assert_impl_any.html
+///
+/// [`Copy`]:       https://doc.rust-lang.org/std/marker/trait.Copy.html
+/// [`Clone`]:      https://doc.rust-lang.org/std/clone/trait.Clone.html
+/// [`Ord`]:        https://doc.rust-lang.org/std/cmp/trait.Ord.html
+/// [`PartialOrd`]: https://doc.rust-lang.org/std/cmp/trait.PartialOrd.html
+/// [`Eq`]:         https://doc.rust-lang.org/std/cmp/trait.Eq.html
+/// [`PartialEq`]:  https://doc.rust-lang.org/std/cmp/trait.PartialEq.html
+#[macro_export(local_inner_macros)]
+macro_rules! assert_trait_sub_any {
+    ($sub:path: $($super:path),+ $(,)?) => {
+        assert_impl!(for(T: $sub) T: $( ($super) )|+);
+    };
+}
diff --git a/src/assert_type.rs b/src/assert_type.rs
new file mode 100644
index 0000000..dd2dc2a
--- /dev/null
+++ b/src/assert_type.rs
@@ -0,0 +1,101 @@
+/// Asserts that _all_ types in a list are equal to each other.
+///
+/// # Examples
+///
+/// Often times, type aliases are used to express usage semantics via naming. In
+/// some cases, the underlying type may differ based on platform. However, other
+/// types like [`c_float`] will always alias the same type.
+///
+/// ```
+/// # #[macro_use] extern crate static_assertions; fn main() {}
+/// use std::os::raw::c_float;
+///
+/// assert_type_eq_all!(c_float, f32);
+/// ```
+///
+/// This macro can also be used to compare types that involve lifetimes! Just
+/// use `'static` in that case:
+///
+/// ```
+/// # #[macro_use] extern crate static_assertions;
+/// # fn main() {
+/// type Buf<'a> = &'a [u8];
+///
+/// assert_type_eq_all!(Buf<'static>, &'static [u8]);
+/// # }
+/// ```
+///
+/// The following example fails to compile because `String` and `str` do not
+/// refer to the same type:
+///
+/// ```compile_fail
+/// # #[macro_use] extern crate static_assertions; fn main() {}
+/// assert_type_eq_all!(String, str);
+/// ```
+///
+/// This should also work the other way around, regardless of [`Deref`]
+/// implementations.
+///
+/// ```compile_fail
+/// # #[macro_use] extern crate static_assertions; fn main() {}
+/// assert_type_eq_all!(str, String);
+/// ```
+///
+/// [`c_float`]: https://doc.rust-lang.org/std/os/raw/type.c_float.html
+/// [`Deref`]: https://doc.rust-lang.org/std/ops/trait.Deref.html
+#[macro_export]
+macro_rules! assert_type_eq_all {
+    ($x:ty, $($xs:ty),+ $(,)*) => {
+        const _: fn() = || { $({
+            trait TypeEq {
+                type This: ?Sized;
+            }
+
+            impl<T: ?Sized> TypeEq for T {
+                type This = Self;
+            }
+
+            fn assert_type_eq_all<T, U>()
+            where
+                T: ?Sized + TypeEq<This = U>,
+                U: ?Sized,
+            {}
+
+            assert_type_eq_all::<$x, $xs>();
+        })+ };
+    };
+}
+
+/// Asserts that _all_ types are **not** equal to each other.
+///
+/// # Examples
+///
+/// Rust has all sorts of slices, but they represent different types of data:
+///
+/// ```
+/// # #[macro_use] extern crate static_assertions; fn main() {}
+/// assert_type_ne_all!([u8], [u16], str);
+/// ```
+///
+/// The following example fails to compile because [`c_uchar`] is a type alias
+/// for [`u8`]:
+///
+/// ```compile_fail
+/// # #[macro_use] extern crate static_assertions; fn main() {}
+/// use std::os::raw::c_uchar;
+///
+/// assert_type_ne_all!(c_uchar, u8, u32);
+/// ```
+///
+/// [`c_uchar`]: https://doc.rust-lang.org/std/os/raw/type.c_uchar.html
+/// [`u8`]: https://doc.rust-lang.org/std/primitive.u8.html
+#[macro_export]
+macro_rules! assert_type_ne_all {
+    ($x:ty, $($y:ty),+ $(,)?) => {
+        const _: fn() = || {
+            trait MutuallyExclusive {}
+            impl MutuallyExclusive for $x {}
+            $(impl MutuallyExclusive for $y {})+
+        };
+    };
+}
diff --git a/src/bool.rs b/src/bool.rs
new file mode 100644
index 0000000..296159f
--- /dev/null
+++ b/src/bool.rs
@@ -0,0 +1,59 @@
+#[derive(Clone, Copy)]
+pub struct True;
+#[derive(Clone, Copy)]
+pub struct False;
+
+impl True {
+    pub const fn not(&self) -> &'static False {
+        &False
+    }
+    pub const fn and<'a, T>(&self, other: &'a T) -> &'a T {
+        other
+    }
+    pub const fn or<T>(&self, _: &T) -> &'static True {
+        &True
+    }
+    pub const fn value(&self) -> bool {
+        true
+    }
+}
+
+impl False {
+    pub const fn not(&self) -> &'static True {
+        &True
+    }
+    pub const fn and<T>(&self, _: &T) -> &'static False {
+        &False
+    }
+    pub const fn or<'a, T>(&self, other: &'a T) -> &'a T {
+        other
+    }
+    pub const fn value(&self) -> bool {
+        false
+    }
+}
+
+pub trait ToBool: Sized {
+    type Bool: Sized;
+    const TO_BOOL: Self::Bool;
+}
+
+impl ToBool for [(); 0] {
+    type Bool = False;
+    const TO_BOOL: Self::Bool = False;
+}
+
+impl ToBool for [(); 1] {
+    type Bool = True;
+    const TO_BOOL: Self::Bool = True;
+}
+
+/// Converts a `const bool` to a type-level boolean.
+#[doc(hidden)]
+#[macro_export]
+macro_rules! _to_bool {
+    ($x:expr) => {{
+        const X: bool = $x;
+        <[(); X as usize] as $crate::_bool::ToBool>::TO_BOOL
+    }};
+}
diff --git a/src/const_assert.rs b/src/const_assert.rs
new file mode 100644
index 0000000..39ad3eb
--- /dev/null
+++ b/src/const_assert.rs
@@ -0,0 +1,178 @@
+/// Asserts that constant expressions evaluate to `true`.
+///
+/// Constant expressions can be ensured to have certain properties via this
+/// macro If the expression evaluates to `false`, the file will fail to compile.
+/// This is synonymous to [`static_assert` in C++][static_assert].
+///
+/// # Alternatives
+///
+/// There also exists [`const_assert_eq`](macro.const_assert_eq.html) for
+/// validating whether a sequence of expressions are equal to one another.
+///
+/// # Examples
+///
+/// A common use case is to guarantee properties about a constant value that's
+/// generated via meta-programming.
+///
+/// ```
+/// # #[macro_use] extern crate static_assertions; fn main() {}
+/// const VALUE: i32 = // ...
+/// # 3;
+///
+/// const_assert!(VALUE >= 2);
+/// ```
+///
+/// Inputs are type-checked as booleans:
+///
+/// ```compile_fail
+/// # #[macro_use] extern crate static_assertions; fn main() {}
+/// const_assert!(!0);
+/// ```
+///
+/// Despite this being a macro, we see this produces a type error:
+///
+/// ```txt
+///   | const_assert!(!0);
+///   |               ^^ expected bool, found integral variable
+///   |
+///   = note: expected type `bool`
+///              found type `{integer}`
+/// ```
+///
+/// The following fails to compile because multiplying by 5 does not have an
+/// identity property:
+///
+/// ```compile_fail
+/// # #[macro_use] extern crate static_assertions; fn main() {}
+/// const_assert!(5 * 5 == 5);
+/// ```
+///
+/// [static_assert]: http://en.cppreference.com/w/cpp/language/static_assert
+#[macro_export(local_inner_macros)]
+macro_rules! const_assert {
+    ($x:expr $(,)?) => {
+        const _: $crate::True = _to_bool!($x);
+    };
+}
+
+/// Asserts that constants are equal in value.
+///
+/// Use [`const_assert_eq_usize!`](macro.const_assert_eq_usize.html) for better
+/// error messages when asserting
+/// [`usize`](https://doc.rust-lang.org/std/primitive.usize.html) equality.
+///
+/// # Examples
+///
+/// This works as a shorthand for `const_assert!(a == b)`:
+///
+/// ```
+/// # #[macro_use] extern crate static_assertions; fn main() {}
+/// const TWO: i32 = 2;
+///
+/// const_assert_eq!(TWO * TWO, TWO + TWO);
+/// ```
+///
+/// Just because 2 × 2 = 2 + 2 doesn't mean it holds true for other numbers:
+///
+/// ```compile_fail
+/// # #[macro_use] extern crate static_assertions; fn main() {}
+/// const_assert_eq!(4 + 4, 4 * 4);
+/// ```
+#[macro_export(local_inner_macros)]
+macro_rules! const_assert_eq {
+    ($x:expr, $($y:expr),+ $(,)?) => {
+        const_assert!($($x == $y)&&+);
+    };
+}
+
+/// Asserts that constants of type
+/// [`usize`](https://doc.rust-lang.org/std/primitive.usize.html) are equal in
+/// value.
+///
+/// This is equivalent to [`const_assert_eq!`](macro.const_assert_eq.html) but
+/// allows for inspecting the values in error messages.
+#[macro_export]
+macro_rules! const_assert_eq_usize {
+    ($x:expr, $($y:expr),+ $(,)?) => {
+        // Assigned instance must match the annotated type or else it will fail.
+        $(const _: [(); $x] = [(); $y];)+
+    };
+}
+
+/// Asserts that constants are **not** equal in value.
+///
+/// # Examples
+///
+/// This works as a shorthand for `const_assert!(a != b)`:
+///
+/// ```
+/// # #[macro_use] extern crate static_assertions; fn main() {}
+/// const NUM: usize = 32;
+///
+/// const_assert_ne!(NUM * NUM, 64);
+/// ```
+///
+/// The following example fails to compile because 2 is magic and 2 × 2 = 2 + 2:
+///
+/// ```compile_fail
+/// # #[macro_use] extern crate static_assertions; fn main() {}
+/// const_assert_ne!(2 + 2, 2 * 2);
+/// ```
+#[macro_export(local_inner_macros)]
+macro_rules! const_assert_ne {
+    ($x:expr, $($y:expr),+ $(,)?) => {
+        const_assert!($($x != $y)&&+);
+    };
+}
+
+/// Asserts that constants are less than each other.
+#[macro_export(local_inner_macros)]
+macro_rules! const_assert_lt {
+    ($x:expr, $($y:expr),+ $(,)?) => {
+        const_assert_lt!(@build $x, $($y),+);
+    };
+    (@build $x:expr) => {};
+    (@build $x:expr, $($y:expr),+) => {
+        const_assert!($x < _head!($($y),+));
+        const_assert_lt!(@build $($y),+);
+    };
+}
+
+/// Asserts that constants are less than or equal to each other.
+#[macro_export(local_inner_macros)]
+macro_rules! const_assert_le {
+    ($x:expr, $($y:expr),+ $(,)?) => {
+        const_assert_le!(@build $x, $($y),+);
+    };
+    (@build $x:expr) => {};
+    (@build $x:expr, $($y:expr),+) => {
+        const_assert!($x <= _head!($($y),+));
+        const_assert_le!(@build $($y),+);
+    };
+}
+
+/// Asserts that constants are greater than each other.
+#[macro_export(local_inner_macros)]
+macro_rules! const_assert_gt {
+    ($x:expr, $($y:expr),+ $(,)?) => {
+        const_assert_gt!(@build $x, $($y),+);
+    };
+    (@build $x:expr) => {};
+    (@build $x:expr, $($y:expr),+) => {
+        const_assert!($x > _head!($($y),+));
+        const_assert_gt!(@build $($y),+);
+    };
+}
+
+/// Asserts that constants are less than or equal to each other.
+#[macro_export(local_inner_macros)]
+macro_rules! const_assert_ge {
+    ($x:expr, $($y:expr),+ $(,)?) => {
+        const_assert_ge!(@build $x, $($y),+);
+    };
+    (@build $x:expr) => {};
+    (@build $x:expr, $($y:expr),+) => {
+        const_assert!($x >= _head!($($y),+));
+        const_assert_ge!(@build $($y),+);
+    };
+}
diff --git a/src/does_impl.rs b/src/does_impl.rs
new file mode 100644
index 0000000..f2d35fe
--- /dev/null
+++ b/src/does_impl.rs
@@ -0,0 +1,108 @@
+/// Returns `true` if the type does implement a logical trait expression.
+///
+/// # Examples
+///
+/// One can mimic `assert_impl!` using this macro:
+///
+/// ```
+/// # #[macro_use] extern crate static_assertions; fn main() {}
+/// const CONDITION: bool = does_impl!(u32: From<u8>);
+///
+/// const_assert!(CONDITION);
+/// ```
+#[macro_export(local_inner_macros)]
+macro_rules! does_impl {
+    ($ty:ty: $($trait_expr:tt)+) => {
+        _does_impl!($ty: $($trait_expr)+).value()
+    };
+}
+
+/// Returns `True` or `False` depending on whether the given type implements the
+/// given trait boolean expression. Can be used in const contexts if it doesn't
+/// depend on outer generic parameters.
+///
+/// This is the core of `assert_impl`.
+#[doc(hidden)]
+#[macro_export(local_inner_macros)]
+macro_rules! _does_impl {
+    ($ty:ty: $($rest:tt)*) => {{
+        #[allow(unused_imports)]
+        use $crate::{
+            _bool::{True, False},
+            _core::{marker::PhantomData, ops::Deref},
+        };
+
+        // Fallback trait that returns false if the type does not implement a
+        // given trait.
+        trait DoesntImpl {
+            const DOES_IMPL: False = False;
+        }
+        impl<T: ?Sized> DoesntImpl for T {}
+
+        // Construct an expression using `True`/`False` and their operators,
+        // that corresponds to the provided expression.
+        *_does_impl!(@boolexpr($ty,) $($rest)*)
+    }};
+
+    (@boolexpr($($args:tt)*) ($($expr:tt)*)) => {
+        _does_impl!(@boolexpr($($args)*) $($expr)*)
+    };
+    (@boolexpr($($args:tt)*) !($($expr:tt)*)) => {
+        _does_impl!(@boolexpr($($args)*) $($expr)*).not()
+    };
+    (@boolexpr($($args:tt)*) ($($left:tt)*) | $($right:tt)*) => {{
+        let left = _does_impl!(@boolexpr($($args)*) $($left)*);
+        let right = _does_impl!(@boolexpr($($args)*) $($right)*);
+        left.or(right)
+    }};
+    (@boolexpr($($args:tt)*) ($($left:tt)*) & $($right:tt)*) => {{
+        let left = _does_impl!(@boolexpr($($args)*) $($left)*);
+        let right = _does_impl!(@boolexpr($($args)*) $($right)*);
+        left.and(right)
+    }};
+    (@boolexpr($($args:tt)*) !($($left:tt)*) | $($right:tt)*) => {{
+        _does_impl!(@boolexpr($($args)*) (!($($left)*)) | $($right)*)
+    }};
+    (@boolexpr($($args:tt)*) !($($left:tt)*) & $($right:tt)*) => {{
+        _does_impl!(@boolexpr($($args)*) (!($($left)*)) & $($right)*)
+    }};
+    (@boolexpr($($args:tt)*) !$left:ident | $($right:tt)*) => {{
+        _does_impl!(@boolexpr($($args)*) !($left) | $($right)*)
+    }};
+    (@boolexpr($($args:tt)*) !$left:ident & $($right:tt)*) => {{
+        _does_impl!(@boolexpr($($args)*) !($left) & $($right)*)
+    }};
+    (@boolexpr($($args:tt)*) $left:ident | $($right:tt)*) => {
+        _does_impl!(@boolexpr($($args)*) ($left) | $($right)*)
+    };
+    (@boolexpr($($args:tt)*) $left:ident & $($right:tt)*) => {{
+        _does_impl!(@boolexpr($($args)*) ($left) & $($right)*)
+    }};
+    (@boolexpr($($args:tt)*) !$expr:ident) => {
+        _does_impl!(@boolexpr($($args)*) !($expr))
+    };
+    (@boolexpr($($args:tt)*) !$expr:path) => {
+        _does_impl!(@boolexpr($($args)*) !($expr))
+    };
+    (@boolexpr($($args:tt)*) $expr:ident) => {
+        _does_impl!(@base($($args)*) $expr)
+    };
+    (@boolexpr($($args:tt)*) $expr:path) => {
+        _does_impl!(@base($($args)*) $expr)
+    };
+
+    (@base($ty:ty, $($args:tt)*) $($trait:tt)*) => {{
+        // Base case: computes whether `ty` implements `trait`.
+        struct Wrapper<T: ?Sized>(PhantomData<T>);
+
+        #[allow(dead_code)]
+        impl<T: ?Sized + $($trait)*> Wrapper<T> {
+            const DOES_IMPL: True = True;
+        }
+
+        // If `$type: $trait`, the `_does_impl` inherent method on `Wrapper`
+        // will be called, and return `True`. Otherwise, the trait method will
+        // be called, which returns `False`.
+        &<Wrapper<$ty>>::DOES_IMPL
+    }};
+}
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..aa7e227
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,142 @@
+//! [![Banner](https://raw.githubusercontent.com/nvzqz/static-assertions-rs/assets/Banner.png)](https://github.com/nvzqz/static-assertions-rs)
+//!
+//! <div align="center">
+//!     <a href="https://crates.io/crates/static_assertions">
+//!         <img src="https://img.shields.io/crates/d/static_assertions.svg" alt="Downloads">
+//!     </a>
+//!     <a href="https://github.com/nvzqz/static-assertions-rs/actions?query=workflow%3ACI">
+//!         <img src="https://github.com/nvzqz/static-assertions-rs/workflows/CI/badge.svg" alt="Build Status">
+//!     </a>
+//!     <img src="https://img.shields.io/badge/rustc-^1.37.0-blue.svg" alt="rustc ^1.37.0">
+//!     <br><br>
+//! </div>
+//!
+//! Assertions to ensure correct assumptions about constants, types, and more.
+//!
+//! _All_ checks provided by this crate are performed at [compile-time]. This
+//! allows for finding errors quickly and early when it comes to ensuring
+//! certain features or aspects of a codebase. These macros are especially
+//! important when exposing a public API that requires types to be the same size
+//! or implement certain traits.
+//!
+//! # Usage
+//!
+//! This crate is available [on crates.io][crate] and can be used by adding the
+//! following to your project's [`Cargo.toml`]:
+//!
+//! ```toml
+//! [dependencies]
+//! static_assertions = "1.1.0"
+//! ```
+//!
+//! and this to your crate root (`main.rs` or `lib.rs`):
+//!
+//! ```
+//! # #[allow(unused_imports)]
+//! #[macro_use]
+//! extern crate static_assertions;
+//! # fn main() {}
+//! ```
+//!
+//! When using [Rust 2018 edition][2018], the following shorthand can help if
+//! having `#[macro_use]` is undesirable.
+//!
+//! ```edition2018
+//! extern crate static_assertions as sa;
+//!
+//! sa::const_assert!(true);
+//! ```
+//!
+//! ## Procedural Extensions
+//!
+//! As an extension crate [`proc_static_assertions`] adds a number of new
+//! assertions to this. These are implemented as [procedural macros], hence the
+//! "proc" prefix. As a result, they have a bit more visibility over what's
+//! being asserted over than normal macros would.
+//!
+//! It can be enabled via the `proc` feature flag in your [`Cargo.toml`]:
+//!
+//! ```toml
+//! [dependencies]
+//! static_assertions = { version = "1.1.0", features = ["proc"] }
+//! ```
+//!
+//! # Examples
+//!
+//! Very thorough examples are provided in the docs for
+//! [each individual macro](#macros). Failure case examples are also documented.
+//!
+//! # Changes
+//!
+//! See [`CHANGELOG.md`](https://github.com/nvzqz/static-assertions-rs/blob/master/CHANGELOG.md)
+//! for an exhaustive list of what has changed from one version to another.
+//!
+//! # Donate
+//!
+//! This project is made freely available (as in free beer), but unfortunately
+//! not all beer is free! So, if you would like to buy me a beer (or coffee or
+//! *more*), then consider supporting my work that's benefited your project
+//! and thousands of others.
+//!
+//! <a href="https://www.patreon.com/nvzqz">
+//!     <img src="https://c5.patreon.com/external/logo/become_a_patron_button.png" alt="Become a Patron!" height="35">
+//! </a>
+//! <a href="https://www.paypal.me/nvzqz">
+//!     <img src="https://buymecoffee.intm.org/img/button-paypal-white.png" alt="Buy me a coffee" height="35">
+//! </a>
+//!
+//! [`proc_static_assertions`]: https://docs.rs/proc_static_assertions
+//! [procedural macros]: https://doc.rust-lang.org/book/ch19-06-macros.html#procedural-macros-for-generating-code-from-attributes
+//! [Rust 1.37]: https://blog.rust-lang.org/2019/08/15/Rust-1.37.0.html
+//! [2018]: https://blog.rust-lang.org/2018/12/06/Rust-1.31-and-rust-2018.html#rust-2018
+//! [crate]: https://crates.io/crates/static_assertions
+//! [compile-time]: https://en.wikipedia.org/wiki/Compile_time
+//! [`Cargo.toml`]: https://doc.rust-lang.org/cargo/reference/manifest.html
+
+#![deny(missing_docs, unused_macros)]
+#![doc(
+    html_root_url = "https://docs.rs/static_assertions/1.1.0",
+    html_logo_url = "https://raw.githubusercontent.com/nvzqz/static-assertions-rs/assets/Icon.png",
+    test(attr(deny(warnings), allow(dead_code)))
+)]
+#![no_std]
+
+#[cfg(feature = "proc_static_assertions")]
+extern crate proc_static_assertions;
+#[cfg(feature = "proc_static_assertions")]
+pub use proc_static_assertions::assert;
+
+// This module should never be used publicly and is not part of this crate's
+// semver requirements.
+#[doc(hidden)]
+pub extern crate core as _core;
+
+mod assert_align;
+mod assert_cfg;
+mod assert_fields;
+mod assert_impl;
+mod assert_obj_safe;
+mod assert_size;
+mod assert_trait;
+mod assert_type;
+mod const_assert;
+mod does_impl;
+
+// Utility macros.
+//
+// These macros should also never be used publicly and are not part of this
+// crate's semver requirements.
+mod util;
+
+// Type-level booleans.
+//
+// This module should never be used publicly and is not part of this crate's
+// semver requirements.
+#[doc(hidden)]
+#[path = "bool.rs"]
+pub mod _bool;
+
+// These types should also never be used publicly and are not part of this
+// crate's semver requirements.
+#[doc(hidden)]
+pub use _bool::{False, True};
diff --git a/src/util.rs b/src/util.rs
new file mode 100644
index 0000000..17dbe79
--- /dev/null
+++ b/src/util.rs
@@ -0,0 +1,7 @@
+#[doc(hidden)]
+#[macro_export]
+macro_rules! _head {
+    ($head:expr $(, $tail:expr)* $(,)?) => {
+        $head
+    };
+}
diff --git a/tests/const.rs b/tests/const.rs
new file mode 100644
index 0000000..cdd2d70
--- /dev/null
+++ b/tests/const.rs
@@ -0,0 +1,15 @@
+#![no_std]
+#![deny(unsafe_code)]
+
+#[macro_use]
+extern crate static_assertions;
+
+const_assert!(true && (true != false));
+const_assert!((true && true) != false);
+const_assert_eq!(false, false);
+
+#[allow(dead_code)]
+const FIVE: usize = 5;
+
+const_assert!(FIVE * 2 == 10);
+const_assert!(FIVE > 2);
diff --git a/tests/eq_size.rs b/tests/eq_size.rs
new file mode 100644
index 0000000..3317b94
--- /dev/null
+++ b/tests/eq_size.rs
@@ -0,0 +1,113 @@
+#![no_std]
+#![deny(unsafe_code)]
+
+#[macro_use]
+extern crate static_assertions;
+
+assert_size_eq!(u8, u8, (u8,), [u8; 1]);
+
+mod assoc_type {
+    trait Trait {
+        type AssocItem: ?Sized;
+    }
+
+    impl<T: ?Sized> Trait for T {
+        type AssocItem = Self;
+    }
+
+    #[allow(dead_code)]
+    struct Value;
+
+    assert_size_eq!(<Value as Trait>::AssocItem, Value);
+
+    // TODO: Is this possible?
+    // pub fn test<T: Trait>() {
+    //     assert_size_eq!(<T as Trait>::AssocItem, T);
+    // }
+}
+
+// Placed in separate module so that DropCounter's fields are private
+mod dc {
+    /// A type that acts like somewhat of a reference counter.
+    pub struct DropCounter<'a> {
+        count: &'a mut i32,
+    }
+
+    impl<'a> DropCounter<'a> {
+        pub fn new(count: &'a mut i32) -> DropCounter<'a> {
+            *count += 1;
+            DropCounter { count }
+        }
+
+        pub fn count(&self) -> i32 {
+            *self.count
+        }
+    }
+
+    impl<'a> Drop for DropCounter<'a> {
+        fn drop(&mut self) {
+            *self.count -= 1
+        }
+    }
+}
+use dc::*;
+
+/// A type that panics on drop.
+#[allow(dead_code)]
+struct PanicDrop<T>(T);
+
+impl<T> Drop for PanicDrop<T> {
+    fn drop(&mut self) {
+        panic!("Dropped!");
+    }
+}
+
+#[test]
+fn test_eq_size() {
+    assert_size_eq!([u8; 2], u16);
+    assert_size_eq!([u8; 2], u16, (u8, u8));
+    assert_size_eq!([u8; 4], u32, (u16, u8, u8), (u16, u16));
+
+    assert_size_eq_val!([0u8; 2], 0u16);
+    assert_size_eq_val!([0u8; 2], 0u16, (0u8, 0u8));
+    assert_size_eq_val!([0u8; 4], 0u32, (0u16, 0u8, 0u8), (0u16, 0u16));
+
+    #[deny(unused_unsafe)]
+    {
+        assert_size_eq!(u8, u8);
+        assert_size_eq_val!(0u8, 0u8);
+    }
+
+    let x = &mut 0;
+    assert_size_eq_ptr!(x, &0);
+    *x = 20;
+    assert_size_eq_ptr!(x, &0);
+
+    // Should fail to compile (un-comment to test manually):
+    // assert_size_eq!(u8, u16);
+    // assert_size_eq_val!(0u8, 0u16);
+}
+
+#[test]
+fn test_eq_size_no_drop() {
+    assert_size_eq!(u32, PanicDrop<u32>);
+    assert_size_eq!(PanicDrop<u32>, u32);
+    assert_size_eq!(PanicDrop<u32>, PanicDrop<u32>);
+}
+
+#[test]
+fn test_eq_size_drop_count() {
+    let mut count = 0;
+    {
+        let dc = DropCounter::new(&mut count);
+        assert_eq!(dc.count(), 1);
+        assert_size_eq_val!(dc, 0usize);
+        assert_eq!(dc.count(), 1);
+        assert_size_eq_val!(dc, 0usize, dc);
+        assert_eq!(dc.count(), 1);
+    }
+    assert_eq!(count, 0);
+
+    assert_size_eq_val!(DropCounter::new(&mut count), 0usize);
+    assert_eq!(count, 0);
+}
diff --git a/tests/fields.rs b/tests/fields.rs
new file mode 100644
index 0000000..c465475
--- /dev/null
+++ b/tests/fields.rs
@@ -0,0 +1,32 @@
+#![no_std]
+#![deny(unsafe_code)]
+
+#[macro_use]
+extern crate static_assertions;
+
+#[allow(dead_code)]
+enum Foo {
+    A { x: u8, y: u8 },
+    B(u8),
+}
+
+assert_fields!(Foo::A: x);
+assert_fields!(Foo::A: x, x);
+assert_fields!(Foo::A: x, y, x);
+
+// TODO: Make tuple field access possible
+// assert_fields!(Foo::B, 0);
+
+mod m {
+    #[allow(dead_code)]
+    pub struct Bar<T: ?Sized> {
+        pub nul: (),
+        pub inner: T,
+    }
+}
+
+#[allow(dead_code)]
+use m::Bar as Baz;
+
+assert_fields!(m::Bar<str>: inner, nul);
+assert_fields!(Baz<dyn Send>: inner, nul);
diff --git a/tests/obj_safe.rs b/tests/obj_safe.rs
new file mode 100644
index 0000000..97847b2
--- /dev/null
+++ b/tests/obj_safe.rs
@@ -0,0 +1,10 @@
+#![no_std]
+#![deny(unsafe_code)]
+
+#[macro_use]
+extern crate static_assertions;
+
+assert_obj_safe!(core::fmt::Debug, Send, Sync);
+
+trait ObjSafe {}
+assert_obj_safe!(ObjSafe);
diff --git a/tests/proc_size.rs b/tests/proc_size.rs
new file mode 100644
index 0000000..b62a36f
--- /dev/null
+++ b/tests/proc_size.rs
@@ -0,0 +1,9 @@
+#![cfg(feature = "proc")]
+
+#[macro_use]
+extern crate static_assertions;
+
+#[assert(size == 4, align == 4)]
+struct Foo {
+    value: i32,
+}
diff --git a/tests/trait_impl.rs b/tests/trait_impl.rs
new file mode 100644
index 0000000..2a6fffd
--- /dev/null
+++ b/tests/trait_impl.rs
@@ -0,0 +1,71 @@
+#![no_std]
+#![deny(unsafe_code)]
+
+#[macro_use]
+extern crate static_assertions;
+
+use core::ops::Range;
+
+trait Tri<A: ?Sized, B: ?Sized, C: ?Sized> {}
+
+impl<T, A: ?Sized, B: ?Sized, C: ?Sized> Tri<A, B, C> for T {}
+
+assert_impl_all!(
+    u64: Tri<[&'static u8], dyn Tri<dyn Send, dyn Sync, str>, (u16, u16)>
+);
+assert_impl_all!(u8: Send, Sync);
+assert_impl_all!(&'static [u8]: IntoIterator<Item=&'static u8>);
+assert_impl_all!(Range<u8>: Iterator<Item=u8>);
+assert_impl_all!([u8]: Send, Sync, AsRef<[u8]>);
+assert_impl_all!(str: Send, Sync, AsRef<[u8]>,);
+
+assert_impl_any!((): Send, Sync);
+assert_impl_any!((): Send, From<u8>);
+assert_impl_any!((): From<u8>, From<u16>, Send);
+
+#[allow(dead_code)]
+struct Foo;
+
+trait A {}
+trait B {}
+trait C {}
+
+impl B for Foo {}
+
+assert_impl_one!(Foo: A, B);
+assert_impl_one!(Foo: B, A);
+assert_impl_one!(Foo: B, C);
+assert_impl_one!(Foo: C, B);
+assert_impl_one!(Foo: A, B, C);
+assert_impl_one!(Foo: B, C, A);
+assert_impl_one!(Foo: C, A, B);
+
+#[derive(Clone)]
+struct Test;
+
+assert_impl!(u8: (From<u16>) | (Into<u16>));
+assert_impl!((): (From<u8>) | (From<u16>) | Send);
+assert_impl!((): (!From<u8>) & !(From<u16>) & Send);
+assert_impl!((): Copy | Clone);
+assert_impl!((): Copy & Clone);
+assert_impl!(Test: Copy | Clone);
+assert_impl!(Test: !Copy | Clone);
+assert_impl!(Test: !Copy & Clone);
+assert_impl!(Test: !Copy & (Clone));
+assert_impl!(Test: !(Copy) & Clone);
+assert_impl!(Test: !(!Clone));
+assert_impl!(Test: !(Copy) & !(!Clone));
+assert_impl!(Test: !(Copy & Clone));
+assert_impl!(str: !Copy & !Clone);
+
+#[derive(Clone)]
+struct Box<T>(T);
+
+assert_impl!(for(T: Clone) Box<T>: Clone);
+assert_impl!(for(T: Clone + Send) Box<T>: Clone & Send);
+assert_impl!(for(T) Box<T>: (From<T>) & (Into<T>));
+
+assert_impl!(for(T) PhantomData<T>: Clone);
+assert_impl!(for(T: Copy) T: Clone);
+assert_impl!(for(T: ?Sized) T: Clone | !Clone);
+assert_impl!(for('a, T: 'a) &'a mut T: !Copy);
diff --git a/tests/type_eq.rs b/tests/type_eq.rs
new file mode 100644
index 0000000..e8036d7
--- /dev/null
+++ b/tests/type_eq.rs
@@ -0,0 +1,15 @@
+#![no_std]
+#![deny(unsafe_code)]
+
+#[macro_use]
+extern crate static_assertions;
+
+assert_type_eq_all!([u8], [u8]);
+
+#[allow(dead_code)]
+type X = u8;
+
+#[allow(unused_parens)]
+mod m {
+    assert_type_eq_all!(super::X, u8, (super::X));
+}
diff --git a/tests/type_ne.rs b/tests/type_ne.rs
new file mode 100644
index 0000000..3adfef0
--- /dev/null
+++ b/tests/type_ne.rs
@@ -0,0 +1,7 @@
+#![no_std]
+#![deny(unsafe_code)]
+
+#[macro_use]
+extern crate static_assertions;
+
+assert_type_ne_all!(u8, u16, u32);