auto merge of #15493 : brson/rust/tostr, r=pcwalton

This updates https://github.com/rust-lang/rust/pull/15075.

Rename `ToStr::to_str` to `ToString::to_string`. The naive renaming ends up with two `to_string` functions defined on strings in the prelude (the other defined via `collections::str::StrAllocating`). To remedy this I removed `StrAllocating::to_string`, making all conversions from `&str` to `String` go through `Show`. This has a measurable impact on the speed of this conversion, but the sense I get from others is that it's best to go ahead and unify `to_string` and address performance for all `to_string` conversions in `core::fmt`. `String::from_str(...)` still works as a manual fast-path.

Note that the patch was done with a script, and ended up renaming a number of other `*_to_str` functions, particularly inside of rustc. All the ones I saw looked correct, and I didn't notice any additional API breakage.

Closes #15046.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/compiletest/errors.rs b/src/compiletest/errors.rs
index 8e79f58c608..7681792bdf5 100644
--- a/src/compiletest/errors.rs
+++ b/src/compiletest/errors.rs
@@ -31,7 +31,7 @@ pub fn load_errors(re: &Regex, testfile: &Path) -> Vec<ExpectedError> {
 fn parse_expected(line_num: uint, line: &str, re: &Regex) -> Option<ExpectedError> {
     re.captures(line).and_then(|caps| {
         let adjusts = caps.name("adjusts").len();
-        let kind = caps.name("kind").to_ascii().to_lower().into_str();
+        let kind = caps.name("kind").to_ascii().to_lower().into_string();
         let msg = caps.name("msg").trim().to_string();
 
         debug!("line={} kind={} msg={}", line_num, kind, msg);