Stabilization change for mod.rs

[blitzerr]

This change is in response to #53125.
The patch makes the feature accepted and removes the tests that tested the
non-accepted status of the feature.

[rust-highfive]

Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @nikomatsakis (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. Due to the way GitHub handles out-of-date commits, this should also make it reasonably obvious what issues have or haven't been addressed.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.

[eddyb]

cc @Mark-Simulacrum

[Mark-Simulacrum]

@bors r+

[bors]

📌 Commit 7f6b608 has been approved by Mark-Simulacrum

[Mark-Simulacrum]

Cc @Centril, this is a stabilization for both 2015 and 2018 editions, which seems fine to me but wanted to confirm (we can change that later if necessary)

[Centril]

@Mark-Simulacrum Seems fine, unless there is a particular reason why this wouldn't work well on edition 2015 (I'm assuming there isn't).

I think our general policy is to reduce technical debt here, which we do by not having to check if something is in edition A or B. That smoother migration and an aura of stability is also achieved is a nice bonus.

[rust-highfive]

The job mingw-check of your PR failed on Travis (raw log). Through arcane magic we have determined that the following fragments from the build log may contain information about the problem.

Click to expand the log.

travis_time:end:1fdba37b:start=1536726918609151940,finish=1536726918616936177,duration=7784237
travis_fold:end:after_failure.3
travis_fold:start:after_failure.4
travis_time:start:0a55131e
$ ln -s . checkout && for CORE in obj/cores/core.*; do EXE=$(echo $CORE | sed 's|obj/cores/core\.[0-9]*\.!checkout!\(.*\)|\1|;y|!|/|'); if [ -f "$EXE" ]; then printf travis_fold":start:crashlog\n\033[31;1m%s\033[0m\n" "$CORE"; gdb -q -c "$CORE" "$EXE" -iex 'set auto-load off' -iex 'dir src/' -iex 'set sysroot .' -ex bt -ex q; echo travis_fold":"end:crashlog; fi; done || true
travis_fold:end:after_failure.4
travis_fold:start:after_failure.5
travis_time:start:052a22ae
travis_time:start:052a22ae
$ cat ./obj/build/x86_64-unknown-linux-gnu/native/asan/build/lib/asan/clang_rt.asan-dynamic-i386.vers || true
cat: ./obj/build/x86_64-unknown-linux-gnu/native/asan/build/lib/asan/clang_rt.asan-dynamic-i386.vers: No such file or directory
travis_fold:end:after_failure.5
travis_fold:start:after_failure.6
travis_time:start:042deedc
$ dmesg | grep -i kill

I'm a bot! I can only do what humans tell me to, so if this was not helpful or you have suggestions for improvements, please ping or otherwise contact @TimNN. (Feature Requests)

[nikomatsakis]

I think this was merged by @kennytm as part of #54146?

[blitzerr]

@nikomatsakis I see this pull in the list of the 15 pulls that were merged. Is anything else required from me on this?