core: allow messages in unimplemented!() macro

rust-lang · Jun 8, 2017 · f517719 · f517719
1 parent 81734e0
commit f517719
Showing 1 changed file with 2 additions and 1 deletion.
diff --git 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.