fixes

Author: alexcrichton

src/libsyntax/ext/bytes.rs

@@ -17,8 +17,6 @@ use ext::base;
 use ext::build::AstBuilder;
 use std::ascii::AsciiExt;
 
-use std::ascii::AsciiCast;
-
 pub fn expand_syntax_ext<'cx>(cx: &'cx mut ExtCtxt,
                               sp: Span,
                               tts: &[ast::TokenTree])

src/libsyntax/feature_gate.rs

@@ -30,7 +30,6 @@ use visit;
 use visit::Visitor;
 use parse::token;
 
-use std::ascii::AsciiCast;
 use std::slice;
 use std::ascii::AsciiExt;