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# 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

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# THIS FILE IS AUTOMATICALLY GENERATED BY CARGO
#
# When uploading crates to the registry Cargo will automatically
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# If you believe there's an error in this file please file an
# issue against the rust-lang/cargo repository. If you're
# editing this file be aware that the upstream Cargo.toml
# will likely look very different (and much more reasonable)
[package]
name = "static_assertions"
version = "1.1.0"
authors = ["Nikolai Vazquez"]
include = ["Cargo.toml", "src/**/*.rs", "README.md", "CHANGELOG.md", "LICENSE*"]
description = "Compile-time assertions to ensure that invariants are met."
homepage = "https://github.com/nvzqz/static-assertions-rs"
documentation = "https://docs.rs/static_assertions/"
readme = "README.md"
keywords = ["assert", "static", "testing"]
categories = ["no-std", "rust-patterns", "development-tools::testing"]
license = "MIT OR Apache-2.0"
repository = "https://github.com/nvzqz/static-assertions-rs"
[features]
nightly = []
[badges.is-it-maintained-issue-resolution]
repository = "nvzqz/static-assertions-rs"
[badges.is-it-maintained-open-issues]
repository = "nvzqz/static-assertions-rs"
[badges.maintenance]
status = "passively-maintained"
[badges.travis-ci]
repository = "nvzqz/static-assertions-rs"

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MIT License
Copyright (c) 2017 Nikolai Vazquez
Permission is hereby granted, free of charge, to any person obtaining a copy
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[![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">
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<a href="https://travis-ci.org/nvzqz/static-assertions-rs">
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<br>
<a href="https://www.patreon.com/nvzqz">
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</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

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/// 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)*)));
};
}

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/// Asserts that types are equal in alignment.
///
/// 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_eq_align!(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_eq_align!([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_eq_align!(i32x4, [i32; 4]);
/// ```
///
/// [FFI]: https://en.wikipedia.org/wiki/Foreign_function_interface
#[macro_export]
macro_rules! assert_eq_align {
($x:ty, $($xs:ty),+ $(,)?) => {
const _: fn() = || {
// Assigned instance must match the annotated type or else it will
// fail to compile
use $crate::_core::mem::align_of;
$(let _: [(); align_of::<$x>()] = [(); align_of::<$xs>()];)+
};
};
}

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/// 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_eq_size_val`](macro.assert_eq_size_val.html) and
/// [`assert_eq_size_ptr`](macro.assert_eq_size_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_eq_size!([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_eq_size!(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_eq_size {
($x:ty, $($xs:ty),+ $(,)?) => {
const _: fn() = || {
$(let _ = $crate::_core::mem::transmute::<$x, $xs>;)+
};
};
}
/// Asserts that values pointed to are equal in size.
///
/// # Examples
///
/// This especially is useful for when coercing pointers between different types
/// and ensuring the underlying values are the same size.
///
/// ```
/// # #[macro_use] extern crate static_assertions; fn main() {}
/// fn operation(x: &(u32, u32), y: &[u16; 4]) {
/// assert_eq_size_ptr!(x, y);
/// // ...
/// }
/// ```
///
/// The following example fails to compile because byte arrays of different
/// lengths have different sizes:
///
/// ```compile_fail
/// # #[macro_use] extern crate static_assertions;
/// # fn main() {
/// static BYTES: &[u8; 4] = &[
/// /* ... */
/// # 0; 4
/// ];
///
/// static TABLE: &[u8; 16] = &[
/// /* ... */
/// # 0; 16
/// ];
///
/// assert_eq_size_ptr!(BYTES, TABLE);
/// ```
#[macro_export]
macro_rules! assert_eq_size_ptr {
($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 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_eq_size_val!(x, y);
/// assert_eq_size_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_eq_size_val!(0u8, 0u32);
/// # }
/// ```
///
/// [`Clone`]: https://doc.rust-lang.org/std/clone/trait.Clone.html
#[macro_export(local_inner_macros)]
macro_rules! assert_eq_size_val {
($x:expr, $($xs:expr),+ $(,)?) => {
assert_eq_size_ptr!(&$x, $(&$xs),+);
}
}

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/// 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: _, .. };)+
};
};
}

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/// Asserts that the type implements exactly one in a set of traits.
///
/// Related:
/// - [`assert_impl_any!`]
/// - [`assert_impl_all!`]
/// - [`assert_not_impl_all!`]
/// - [`assert_not_impl_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_not_impl_all!`]: macro.assert_not_impl_all.html
/// [`assert_not_impl_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 _ = <$x as AmbiguousIfMoreThanOne<_>>::some_item;
};
};
}
/// Asserts that the type implements _all_ of the given traits.
///
/// See [`assert_not_impl_all!`] for achieving the opposite effect.
///
/// # Examples
///
/// This can be used to ensure types implement auto traits such as [`Send`] and
/// [`Sync`], as well as traits with [blanket `impl`s][blanket].
///
/// ```
/// # #[macro_use] extern crate static_assertions; fn main() {}
/// assert_impl_all!(u32: Copy, Send);
/// assert_impl_all!(&str: Into<String>);
/// ```
///
/// The following example fails to compile because raw pointers do not implement
/// [`Send`] since they cannot be moved between threads safely:
///
/// ```compile_fail
/// # #[macro_use] extern crate static_assertions; fn main() {}
/// assert_impl_all!(*const u8: Send);
/// ```
///
/// [`assert_not_impl_all!`]: macro.assert_not_impl_all.html
/// [`Send`]: https://doc.rust-lang.org/std/marker/trait.Send.html
/// [`Sync`]: https://doc.rust-lang.org/std/marker/trait.Sync.html
/// [blanket]: https://doc.rust-lang.org/book/ch10-02-traits.html#using-trait-bounds-to-conditionally-implement-methods
#[macro_export]
macro_rules! assert_impl_all {
($type:ty: $($trait:path),+ $(,)?) => {
const _: fn() = || {
// Only callable when `$type` implements all traits in `$($trait)+`.
fn assert_impl_all<T: ?Sized $(+ $trait)+>() {}
assert_impl_all::<$type>();
};
};
}
/// Asserts that the type implements _any_ of the given traits.
///
/// See [`assert_not_impl_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_not_impl_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]
macro_rules! assert_impl_any {
($x:ty: $($t:path),+ $(,)?) => {
const _: fn() = || {
use $crate::_core::marker::PhantomData;
use $crate::_core::ops::Deref;
// Fallback to use as the first iterative assignment to `previous`.
let previous = AssertImplAnyFallback;
struct AssertImplAnyFallback;
// Ensures that blanket traits can't impersonate the method. This
// prevents a false positive attack where---if a blanket trait is in
// scope that has `_static_assertions_impl_any`---the macro will
// compile when it shouldn't.
//
// See https://github.com/nvzqz/static-assertions-rs/issues/19 for
// more info.
struct ActualAssertImplAnyToken;
trait AssertImplAnyToken {}
impl AssertImplAnyToken for ActualAssertImplAnyToken {}
fn assert_impl_any_token<T: AssertImplAnyToken>(_: T) {}
$(let previous = {
struct Wrapper<T, N>(PhantomData<T>, N);
// If the method for this wrapper can't be called then the
// compiler will insert a deref and try again. This forwards the
// compiler's next attempt to the previous wrapper.
impl<T, N> Deref for Wrapper<T, N> {
type Target = N;
fn deref(&self) -> &Self::Target {
&self.1
}
}
// This impl is bounded on the `$t` trait, so the method can
// only be called if `$x` implements `$t`. This is why a new
// `Wrapper` is defined for each `previous`.
impl<T: $t, N> Wrapper<T, N> {
fn _static_assertions_impl_any(&self) -> ActualAssertImplAnyToken {
ActualAssertImplAnyToken
}
}
Wrapper::<$x, _>(PhantomData, previous)
};)+
// Attempt to find the method that can actually be called. The found
// method must return a type that implements the sealed `Token`
// trait, this ensures that blanket trait methods can't cause this
// macro to compile.
assert_impl_any_token(previous._static_assertions_impl_any());
};
};
}
/// 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_not_impl_any!`] instead.
///
/// # Examples
///
/// Although `u32` implements `From<u16>`, it does not implement `Into<usize>`:
///
/// ```
/// # #[macro_use] extern crate static_assertions; fn main() {}
/// assert_not_impl_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_not_impl_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_not_impl_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_not_impl_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_not_impl_any!`]: macro.assert_not_impl_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]
macro_rules! assert_not_impl_all {
($x:ty: $($t:path),+ $(,)?) => {
const _: fn() = || {
// Generic trait with a blanket impl over `()` for all types.
trait AmbiguousIfImpl<A> {
// Required for actually being able to reference the trait.
fn some_item() {}
}
impl<T: ?Sized> AmbiguousIfImpl<()> for T {}
// Used for the specialized impl when *all* traits in
// `$($t)+` are implemented.
#[allow(dead_code)]
struct Invalid;
impl<T: ?Sized $(+ $t)+> AmbiguousIfImpl<Invalid> for T {}
// If there is only one specialized trait impl, type inference with
// `_` can be resolved and this can compile. Fails to compile if
// `$x` implements `AmbiguousIfImpl<Invalid>`.
let _ = <$x as AmbiguousIfImpl<_>>::some_item;
};
};
}
/// Asserts that the type does **not** implement _any_ of the given traits.
///
/// This can be used to ensure types do not implement auto traits such as
/// [`Send`] and [`Sync`], as well as traits with [blanket `impl`s][blanket].
///
/// This macro causes a compilation failure if any of the provided individual
/// traits are implemented for the type. If you want to check that a combination
/// of traits is not implemented you should invoke [`assert_not_impl_all!`]
/// instead. For single traits both macros behave the same.
///
/// # Examples
///
/// If `u32` were to implement `Into` conversions for `usize` _and_ for `u8`,
/// the following would fail to compile:
///
/// ```
/// # #[macro_use] extern crate static_assertions; fn main() {}
/// assert_not_impl_any!(u32: Into<usize>, Into<u8>);
/// ```
///
/// This is also good for simple one-off cases:
///
/// ```
/// # #[macro_use] extern crate static_assertions; fn main() {}
/// assert_not_impl_any!(&'static mut u8: Copy);
/// ```
///
/// The following example fails to compile since `u32` can be converted into
/// `u64` even though it can not be converted into a `u16`:
///
/// ```compile_fail
/// # #[macro_use] extern crate static_assertions; fn main() {}
/// assert_not_impl_any!(u32: Into<u64>, Into<u16>);
/// ```
///
/// [`Send`]: https://doc.rust-lang.org/std/marker/trait.Send.html
/// [`Sync`]: https://doc.rust-lang.org/std/marker/trait.Sync.html
/// [`assert_not_impl_all!`]: macro.assert_not_impl_all.html
/// [blanket]: https://doc.rust-lang.org/book/ch10-02-traits.html#using-trait-bounds-to-conditionally-implement-methods
#[macro_export]
macro_rules! assert_not_impl_any {
($x:ty: $($t:path),+ $(,)?) => {
const _: fn() = || {
// Generic trait with a blanket impl over `()` for all types.
trait AmbiguousIfImpl<A> {
// Required for actually being able to reference the trait.
fn some_item() {}
}
impl<T: ?Sized> AmbiguousIfImpl<()> for T {}
// Creates multiple scoped `Invalid` types for each trait `$t`, over
// which a specialized `AmbiguousIfImpl<Invalid>` is implemented for
// every type that implements `$t`.
$({
#[allow(dead_code)]
struct Invalid;
impl<T: ?Sized + $t> AmbiguousIfImpl<Invalid> for T {}
})+
// If there is only one specialized trait impl, type inference with
// `_` can be resolved and this can compile. Fails to compile if
// `$x` implements any `AmbiguousIfImpl<Invalid>`.
let _ = <$x as AmbiguousIfImpl<_>>::some_item;
};
};
}

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// 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;)+
};
}

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/// 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]
macro_rules! assert_trait_sub_all {
($sub:path: $($super:path),+ $(,)?) => {
const _: () = {
// One scope per super-trait.
$({
#[allow(non_camel_case_types)]
trait __Impl_Implication: $super {}
// Can only be implemented for `$sub` types if `$super` is
// also implemented.
impl<T: $sub> __Impl_Implication for T {}
})+
};
};
}
/// Asserts that the trait is a parent of all of the other traits.
///
/// Related:
/// - [`assert_trait_sub_all!`]
///
/// # Examples
///
/// With this, traits `A` and `B` can both be tested to require [`Copy`] on a
/// single line:
///
/// ```
/// # use static_assertions::assert_trait_super_all;
/// trait A: Copy {}
/// trait B: Copy {}
///
/// assert_trait_super_all!(Copy: A, B);
/// ```
///
/// Otherwise, each sub-trait would require its own call to
/// [`assert_trait_sub_all!`]:
///
/// ```
/// # #[macro_use] extern crate static_assertions; fn main() {}
/// # trait A: Copy {}
/// # trait B: Copy {}
/// assert_trait_sub_all!(A: Copy);
/// assert_trait_sub_all!(B: Copy);
/// ```
///
/// The following example fails to compile because trait `C` does not require
/// [`Copy`]:
///
/// ```compile_fail
/// # use static_assertions::assert_trait_super_all;
/// # trait A: Copy {}
/// # trait B: Copy {}
/// trait C {}
///
/// assert_trait_super_all!(Copy: A, B, C);
/// ```
///
/// [`assert_trait_sub_all!`]: macro.assert_trait_sub_all.html
///
/// [`Copy`]: https://doc.rust-lang.org/std/marker/trait.Copy.html
#[macro_export(local_inner_macros)]
macro_rules! assert_trait_super_all {
($super:path: $($sub:path),+ $(,)?) => {
$(assert_trait_sub_all!($sub: $super);)+
};
}

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/// 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 {})+
};
};
}

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/// 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]
macro_rules! const_assert {
($x:expr $(,)?) => {
#[allow(unknown_lints, eq_op)]
const _: [(); 0 - !{ const ASSERT: bool = $x; ASSERT } as usize] = [];
};
}
/// Asserts that constants are equal in value.
///
/// # Examples
///
/// This works as a shorthand for `const_assert!(a == b)`:
///
/// ```
/// # #[macro_use] extern crate static_assertions; fn main() {}
/// const TWO: usize = 2;
///
/// const_assert_eq!(TWO * TWO, TWO + TWO);
/// ```
///
/// Just because 2 × 2 = 2 + 2 doesn't mean it holds true for other numbers:
///
/// ```compile_fail
/// # #[macro_use] extern crate static_assertions; fn main() {}
/// const_assert_eq!(4 + 4, 4 * 4);
/// ```
#[macro_export(local_inner_macros)]
macro_rules! const_assert_eq {
($x:expr, $y:expr $(,)?) => {
const_assert!($x == $y);
};
}
/// Asserts that constants are **not** equal in value.
///
/// # Examples
///
/// This works as a shorthand for `const_assert!(a != b)`:
///
/// ```
/// # #[macro_use] extern crate static_assertions; fn main() {}
/// const NUM: usize = 32;
///
/// const_assert_ne!(NUM * NUM, 64);
/// ```
///
/// The following example fails to compile because 2 is magic and 2 × 2 = 2 + 2:
///
/// ```compile_fail
/// # #[macro_use] extern crate static_assertions; fn main() {}
/// const_assert_ne!(2 + 2, 2 * 2);
/// ```
#[macro_export(local_inner_macros)]
macro_rules! const_assert_ne {
($x:expr, $y:expr $(,)?) => {
const_assert!($x != $y);
};
}

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//! [![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://travis-ci.org/nvzqz/static-assertions-rs">
//! <img src="https://travis-ci.org/nvzqz/static-assertions-rs.svg?branch=master" 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`):
//!
//! ```
//! #[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);
//! ```
//!
//! # 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>
//!
//! [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
#![doc(html_root_url = "https://docs.rs/static_assertions/1.1.0")]
#![doc(html_logo_url = "https://raw.githubusercontent.com/nvzqz/static-assertions-rs/assets/Icon.png")]
#![no_std]
#![deny(unused_macros)]
#[doc(hidden)]
pub extern crate core as _core;
mod assert_cfg;
mod assert_eq_align;
mod assert_eq_size;
mod assert_fields;
mod assert_impl;
mod assert_obj_safe;
mod assert_trait;
mod assert_type;
mod const_assert;