Removed ascii functions from other modules

Replaced str::to_lowercase and str::to_uppercase

src/compiletest/errors.rs

@@ -50,7 +50,10 @@ fn parse_expected(line_num: uint, line: ~str) -> ~[ExpectedError] {
     while idx < len && line[idx] == (' ' as u8) { idx += 1u; }
     let start_kind = idx;
     while idx < len && line[idx] != (' ' as u8) { idx += 1u; }
-    let kind = str::to_lower(str::slice(line, start_kind, idx).to_owned());
+
+    // FIXME: 4318 Instead of to_str_ascii, could use
+    // to_str_consume to not do a unneccessary copy.
+    let kind = str::slice(line, start_kind, idx).to_ascii().to_lower().to_str_ascii();
 
     // Extract msg:
     while idx < len && line[idx] == (' ' as u8) { idx += 1u; }