Copy `AsciiExt` methods to `str` directly

This is done in order to deprecate AsciiExt eventually. Note that
this commit contains a bunch of `cfg(stage0)` statements. This is
due to a new compiler feature this commit depends on: the
`slice_u8` lang item. Once this lang item is available in the
stage0 compiler, all those cfg flags (and more) can be removed.

1 files changed, 0 insertions, 1 deletions

diff --git a/src/libsyntax/feature_gate.rs b/src/libsyntax/feature_gate.rs
index 30451ec757a..195aac5292f 100644
--- a/src/libsyntax/feature_gate.rs
+++ b/src/libsyntax/feature_gate.rs
@@ -35,7 +35,6 @@ use visit::{self, FnKind, Visitor};
 use parse::ParseSess;
 use symbol::Symbol;
 
-use std::ascii::AsciiExt;
 use std::env;
 
 macro_rules! set {