Call write_fmt directly to format an Arguments value.

It's just as convenient, but it's much faster. Using write! requires an
extra call to fmt::write and a extra dynamically dispatched call to
Arguments' Display format function.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/libcollections/fmt.rs b/src/libcollections/fmt.rs
index 46b1ad2138b..5f0d9012d1a 100644
--- a/src/libcollections/fmt.rs
+++ b/src/libcollections/fmt.rs
@@ -443,6 +443,6 @@ use string;
 #[stable(feature = "rust1", since = "1.0.0")]
 pub fn format(args: Arguments) -> string::String {
     let mut output = string::String::new();
-    let _ = write!(&mut output, "{}", args);
+    let _ = output.write_fmt(args);
     output
 }