Fix #27567: remove --crate-type=lib from pretty test

[TimNN]

Because I wanted to change the pretty test as little as possible I added // compiler-flags: --crate-type=lib to those test that failed because of a missing main. Passes make check-stage1-pretty locally.

cc @nrc
cc #27567

[rust-highfive]

Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @alexcrichton (or someone else) soon.

If any changes to this PR are deemed necessary, please add them as extra commits. This ensures that the reviewer can see what has changed since they last reviewed the code. The way Github handles out-of-date commits, this should also make it reasonably obvious what issues have or haven't been addressed. Large or tricky changes may require several passes of review and changes.

Please see the contribution instructions for more information.

[brson]

@bors r+ Nice cleanup.

[bors]

📌 Commit 9fd0845 has been approved by brson

[bors]

⌛ Testing commit 9fd0845 with merge 516a1a3...

[bors]

💔 Test failed - auto-linux-32-opt

[TimNN]

So, travis passed and homu failed with an Illegal instruction during compile-fail, which seems to be totally unrelated to any of my changes. Is this just a sporadic failure or is there some action required on my part?

[nrc]

@bors: retry

[bors]

⌛ Testing commit 9fd0845 with merge 3b232d6...

[nrc]

Travis only runs make tidy so doesn't mean much. The c-fail error could be legit, or perhaps not, we'll see...

[TimNN]

@nrc Since some time ago, travis actually runs make check! https://github.com/rust-lang/rust/blob/master/.travis.yml#L23

[nrc]

oh, neat!

[bors]

💔 Test failed - auto-linux-32-opt

[TimNN]

Looks like #27619

[dotdash]

@bors retry

[TimNN]

Seeing as travis passed again, this should be fine now after the fail as part of the rollup (#27658 (comment))

[alexcrichton]

@bors: r+ f0ea2b6

[bors]

⌛ Testing commit f0ea2b6 with merge dcdcc6f...

[bors]

⛄ The build was interrupted to prioritize another pull request.

[bors]

⚡ Previous build results for auto-mac-32-opt, auto-mac-64-nopt-t, auto-mac-64-opt are reusable. Rebuilding only auto-linux-32-nopt-t, auto-linux-32-opt, auto-linux-64-nopt-t, auto-linux-64-opt, auto-linux-64-x-android-t, auto-win-gnu-32-nopt-t, auto-win-gnu-32-opt, auto-win-gnu-64-nopt-t, auto-win-gnu-64-opt, auto-win-msvc-32-opt, auto-win-msvc-64-opt...

[bors]

☀️ Test successful - auto-linux-32-nopt-t, auto-linux-32-opt, auto-linux-64-nopt-t, auto-linux-64-opt, auto-linux-64-x-android-t, auto-mac-32-opt, auto-mac-64-nopt-t, auto-mac-64-opt, auto-win-gnu-32-nopt-t, auto-win-gnu-32-opt, auto-win-gnu-64-nopt-t, auto-win-gnu-64-opt, auto-win-msvc-32-opt, auto-win-msvc-64-opt