std: unbox closures used in function arguments

2014-12-30 18:05:17 -05:00
parent a17c2b60e1
commit 371f04d433
4 changed files with 7 additions and 5 deletions
--- a/src/libstd/io/stdio.rs
+++ b/src/libstd/io/stdio.rs
@@ -334,7 +334,7 @@ pub fn set_stderr(stderr: Box<Writer + Send>) -> Option<Box<Writer + Send>> {
 //          // io1 aliases io2
 //      })
 //  })
-fn with_task_stdout(f: |&mut Writer| -> IoResult<()>) {
+fn with_task_stdout<F>(f: F) where F: FnOnce(&mut Writer) -> IoResult<()> {
    let mut my_stdout = LOCAL_STDOUT.with(|slot| {
        slot.borrow_mut().take()
    }).unwrap_or_else(|| {