core: allow messages in unimplemented!() macro

seanmonstar · seanmonstar · commit f51771939ba5 · 2017-06-07T17:06:55.000-07:00
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.

Original file line number	Diff line number	Diff line change
`@@ -542,7 +542,8 @@ macro_rules! unreachable {`
`542`	`542`	`#[macro_export]`
`543`	`543`	`#[stable(feature = "rust1", since = "1.0.0")]`
`544`	`544`	`macro_rules! unimplemented {`
`545`		`- () => (panic!("not yet implemented"))`
	`545`	`+ () => (panic!("not yet implemented"));`
	`546`	`+ ($($arg:tt)+) => (panic!("not yet implemented: {}", format_args!($($arg)*)));`
`546`	`547`	`}`
`547`	`548`
`548`	`549`	`/// Built-in macros to the compiler itself.`