auto merge of #491 : alexcrichton/cargo/issue-481, r=brson
authorbors <bors@rust-lang.org>
Wed, 3 Sep 2014 02:29:02 +0000 (02:29 +0000)
committerbors <bors@rust-lang.org>
Wed, 3 Sep 2014 02:29:02 +0000 (02:29 +0000)
commit0f988ad0433e9986f98c9d243d5784c17ab9051d
treec460898732f26c163f3cf6cb44bcef976faf33e7
parente573384e65b8a0dbbd1a2418c2580aaf8aa3c414
parentb48b54732e338d4cb7cd7eff0ad703bb083e7397
auto merge of #491 : alexcrichton/cargo/issue-481, r=brson

The return value of `err.output()` will be `None` if the rustdoc executable
failed to spawn, in which case we can give a more graceful error message.

Closes #481
src/cargo/ops/cargo_rustc/mod.rs