diff options
Diffstat (limited to 'src/libstd')
| -rw-r--r-- | src/libstd/macros.rs | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/src/libstd/macros.rs b/src/libstd/macros.rs index d82147947de..0c91542e5eb 100644 --- a/src/libstd/macros.rs +++ b/src/libstd/macros.rs @@ -211,7 +211,15 @@ macro_rules! debug_assert_eq( /// ``` #[macro_export] macro_rules! unreachable( - () => (panic!("internal error: entered unreachable code")) + () => ({ + panic!("internal error: entered unreachable code") + }); + ($msg:expr) => ({ + unreachable!("{}", $msg) + }); + ($fmt:expr, $($arg:tt)*) => ({ + panic!(concat!("internal error: entered unreachable code: ", $fmt), $($arg)*) + }); ) /// A standardised placeholder for marking unfinished code. It panics with the |