core: allow messages in unimplemented!() macro

2017-06-07 17:06:55 -07:00 · 2017-06-07 17:06:55 -07:00 · f51771939b
commit f51771939b
parent 81734e0e06
1 changed files with 2 additions and 1 deletions
--- a/src/libcore/macros.rs
+++ b/src/libcore/macros.rs
@ -542,7 +542,8 @@ macro_rules! unreachable {
 #[macro_export]
 #[stable(feature = "rust1", since = "1.0.0")]
 macro_rules! unimplemented {
-    () => (panic!("not yet implemented"))
+    () => (panic!("not yet implemented"));
+    ($($arg:tt)+) => (panic!("not yet implemented: {}", format_args!($($arg)*)));
 }

 /// Built-in macros to the compiler itself.