std::ascii: Provide a copyless [Ascii] -> str method.

This renames to_str_ascii to as_str_ascii and makes it non-copying,
which is possible now that strings no longer have a hidden extra
byte/null terminator.

Fixes #6120.

1 files changed, 1 insertions, 3 deletions

diff --git a/src/compiletest/errors.rs b/src/compiletest/errors.rs
index 8bfef9da805..dcb0d2ef01d 100644
--- a/src/compiletest/errors.rs
+++ b/src/compiletest/errors.rs
@@ -52,10 +52,8 @@ fn parse_expected(line_num: uint, line: ~str) -> ~[ExpectedError] {
     let start_kind = idx;
     while idx < len && line[idx] != (' ' as u8) { idx += 1u; }
 
-    // FIXME: #4318 Instead of to_ascii and to_str_ascii, could use
-    // to_ascii_consume and to_str_consume to not do a unnecessary copy.
     let kind = line.slice(start_kind, idx);
-    let kind = kind.to_ascii().to_lower().to_str_ascii();
+    let kind = kind.to_ascii().to_lower().into_str();
 
     // Extract msg:
     while idx < len && line[idx] == (' ' as u8) { idx += 1u; }