From 36d22d82aa202bb199967e9512281e9a53db42c9 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 21:33:14 +0200 Subject: Adding upstream version 115.7.0esr. Signed-off-by: Daniel Baumann --- third_party/rust/new_debug_unreachable/src/lib.rs | 36 +++++++++++++++++++++++ 1 file changed, 36 insertions(+) create mode 100644 third_party/rust/new_debug_unreachable/src/lib.rs (limited to 'third_party/rust/new_debug_unreachable/src') diff --git a/third_party/rust/new_debug_unreachable/src/lib.rs b/third_party/rust/new_debug_unreachable/src/lib.rs new file mode 100644 index 0000000000..db0f968f0a --- /dev/null +++ b/third_party/rust/new_debug_unreachable/src/lib.rs @@ -0,0 +1,36 @@ +#![deny(missing_docs, warnings)] + +#![no_std] + +//! `panic!()` in debug builds, optimization hint in release. + +#[doc(hidden)] pub mod _internal { pub use core::hint::unreachable_unchecked; } + +#[macro_export] +/// `panic!()` in debug builds, optimization hint in release. +/// +/// Example: +/// +/// ``` +/// use debug_unreachable::debug_unreachable; +/// +/// fn main() { +/// if 0 > 100 { +/// // Can't happen! +/// unsafe { debug_unreachable!() } +/// } else { +/// println!("Good, 0 <= 100."); +/// } +/// } +/// ``` +macro_rules! debug_unreachable { + () => { debug_unreachable!("entered unreachable code") }; + ($e:expr) => { + if cfg!(debug_assertions) { + panic!($e) + } else { + $crate::_internal::unreachable_unchecked() + } + } +} + -- cgit v1.2.3