Add more tests for fixed ICEs

[JohnTitor]

Closes #36122 (fixed in 1.20.0)
Closes #58094 (fixed in #66054)
Also, fix mistaken test case, from #30904 to #30906 (cc @eddyb)

r? @Centril

[Centril]

r=me rollup with comment ^-- addressed

[rust-highfive]

The job x86_64-gnu-llvm-6.0 of your PR failed (pretty log, 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.

2019-11-14T09:15:42.4392114Z ##[command]git remote add origin https://github.com/rust-lang/rust
2019-11-14T09:15:42.4595011Z ##[command]git config gc.auto 0
2019-11-14T09:15:42.4672564Z ##[command]git config --get-all http.https://github.com/rust-lang/rust.extraheader
2019-11-14T09:15:42.4731808Z ##[command]git config --get-all http.proxy
2019-11-14T09:15:42.4899092Z ##[command]git -c http.extraheader="AUTHORIZATION: basic ***" fetch --force --tags --prune --progress --no-recurse-submodules --depth=2 origin +refs/heads/*:refs/remotes/origin/* +refs/pull/66407/merge:refs/remotes/pull/66407/merge
---
2019-11-14T09:21:42.6989621Z    Compiling serde_json v1.0.40
2019-11-14T09:21:44.3837934Z    Compiling tidy v0.1.0 (/checkout/src/tools/tidy)
2019-11-14T09:21:54.7443967Z     Finished release [optimized] target(s) in 1m 24s
2019-11-14T09:21:54.7550190Z tidy check
2019-11-14T09:21:54.9518466Z tidy error: /checkout/src/test/ui/parser/issue-58094-missing-right-square-bracket.rs: ignoring trailing newlines unnecessarily
2019-11-14T09:21:57.3356558Z Found 486 error codes
2019-11-14T09:21:57.3357419Z Found 0 error codes with no tests
2019-11-14T09:21:57.3357994Z Done!
2019-11-14T09:21:57.3358387Z some tidy checks failed
2019-11-14T09:21:57.3358387Z some tidy checks failed
2019-11-14T09:21:57.3360647Z 
2019-11-14T09:21:57.3361183Z 
2019-11-14T09:21:57.3365884Z command did not execute successfully: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage0-tools-bin/tidy" "/checkout/src" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage0/bin/cargo" "--no-vendor"
2019-11-14T09:21:57.3366688Z 
2019-11-14T09:21:57.3366863Z 
2019-11-14T09:21:57.3378295Z failed to run: /checkout/obj/build/bootstrap/debug/bootstrap test src/tools/tidy
2019-11-14T09:21:57.3378878Z Build completed unsuccessfully in 0:01:27
2019-11-14T09:21:57.3378878Z Build completed unsuccessfully in 0:01:27
2019-11-14T09:21:57.3443639Z == clock drift check ==
2019-11-14T09:21:57.3445114Z   local time: Thu Nov 14 09:21:57 UTC 2019
2019-11-14T09:21:57.4954385Z   network time: Thu, 14 Nov 2019 09:21:57 GMT
2019-11-14T09:21:57.4954721Z == end clock drift check ==
2019-11-14T09:21:58.7629442Z 
2019-11-14T09:21:58.7744561Z ##[error]Bash exited with code '1'.
2019-11-14T09:21:58.7767233Z ##[section]Starting: Checkout
2019-11-14T09:21:58.7768779Z ==============================================================================
2019-11-14T09:21:58.7768891Z Task         : Get sources
2019-11-14T09:21:58.7768934Z Description  : Get sources from a repository. Supports Git, TfsVC, and SVN repositories.

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)

[JohnTitor]

Ugh, applying suggestion inserted a new line for some reason, fixed.

[Centril]

👍 @bors r+

[bors]

📌 Commit 9cdd854 has been approved by Centril

[JohnTitor]

Failed in #66432 (comment)
@bors r-

[Centril]

You'll need to do --bless --compare-mode=nll to fix that error. r=me when done.

[Centril]

Let's give it another go, @bors r+

[bors]

📌 Commit 614abe4 has been approved by Centril