tree 9ce8b1e6925a6299109068fae7f122bfe45ee349
parent 3cf8669673b639b164e5f46fd358983051d15b0c
author Natalie Weizenbaum <nweiz@google.com> 1441147523 -0700
committer Natalie Weizenbaum <nweiz@google.com> 1441147523 -0700

Make the package strong-mode clean.

This caught a bug in which we were calling _FileSpan._start and
_FileSpan._end on a span we couldn't guarantee to be a _FileSpan.

R=sigmund@google.com

Review URL: https://codereview.chromium.org//1328583002 .