Fix "pretty" mode tests

[denzp]

Adjust to Rust command line changes related to "pretty" mode tests.

Fixes #111

[laumann]

Thanks! I noticed the AppVeyor build doesn't actually run the cargo test in the test-project (I need to fix that), so I ran it myself. Nightly works fine (as I expected), but running cargo test --features stable doesn't work because the -Z option is not allowed on stable.

Does this break using compiletest on stable? Or is it just not possible to use "pretty" mode on stable? I would be OK with the latter, but the former would bother some users.

[laumann]

Hmm, I think I answered my own question: One of the removed lines is

-            .arg("-Zunstable-options")

which already shouldn't work on stable, so I think "pretty" works on nightly only (but the other modes are fine).

Do you agree? If so, I'll merge this and release a new version.

[denzp]

Right, before it was -Zunstable-options now it's -Zunpretty. According to the error message, unfortunately, these test even before couldn only be used on nightly:

error: the option `Z` is only accepted on the nightly compiler

I'm going to add one more commit to disable the tests on stable.

[laumann]

Beautiful, thanks!

[laumann]

0.3.11 is out