Update io iterators to produce IoResults

Most IO related functions return an IoResult so that the caller can handle failure
in whatever way is appropriate. However, the `lines`, `bytes`, and `chars` iterators all
supress errors. This means that code that needs to handle errors can't use any of these
iterators. All three of these iterators were updated to produce IoResults.

Fixes #12368

1 files changed, 1 insertions, 1 deletions

diff --git a/src/compiletest/errors.rs b/src/compiletest/errors.rs
index 3a6b1666c1e..4fee64e6304 100644
--- a/src/compiletest/errors.rs
+++ b/src/compiletest/errors.rs
@@ -19,7 +19,7 @@ pub fn load_errors(testfile: &Path) -> ~[ExpectedError] {
     let mut rdr = BufferedReader::new(File::open(testfile).unwrap());
     let mut line_num = 1u;
     for ln in rdr.lines() {
-        error_patterns.push_all_move(parse_expected(line_num, ln));
+        error_patterns.push_all_move(parse_expected(line_num, ln.unwrap()));
         line_num += 1u;
     }
     return error_patterns;