Don't try to clean predicates involving ReErased

[Aaron1011]

There's nothing to render when we have a bound involving ReErased (either
a type or region outliving it), so we don't attempt to generate a clean
WherePredicate

Fixes #57806

I haven't been able to come up with a minimized reproduction for the issue, but I've confirmed that this allows the docs to build for parqet-rs

[Centril]

r? @QuietMisdreavus

[GuillaumeGomez]

Thanks!

@bors: r+

[bors]

📌 Commit e4fedf4 has been approved by GuillaumeGomez

[bors]

⌛ Testing commit e4fedf4 with merge 1edb31f...

[bors]

💔 Test failed - status-appveyor

[Aaron1011]

@GuillaumeGomez: This appears to be a spurious failure. Here's the end of the log for the failing Appveyor log:

Successful compile (408.281 sec). Resulting Setup program filename is:
C:\projects\rust\build\tmp\dist\exe\rust-nightly-x86_64-pc-windows-gnu.exe
rust.wxs
ui.wxs
rustwelcomedlg.wxs
RustcGroup.wxs
DocsGroup.wxs
CargoGroup.wxs
StdGroup.wxs
RlsGroup.wxs
ClippyGroup.wxs
MiriGroup.wxs
AnalysisGroup.wxs
GccGroup.wxs

[GuillaumeGomez]

Not convenient...

@bors: retry

[bors]

⌛ Testing commit e4fedf4 with merge dadc4eeda88bc5bf9e6e97a3879f2b29d559252e...

[bors]

💔 Test failed - checks-travis

[rust-highfive]

The job dist-x86_64-apple-alt 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.

[00:01:37]    Compiling serde_derive v1.0.81
[00:01:39]    Compiling toml v0.4.10
[00:01:39]    Compiling serde_json v1.0.33
[00:01:50]    Compiling bootstrap v0.0.0 (/Users/travis/build/rust-lang/rust/src/bootstrap)
No output has been received in the last 30m0s, this potentially indicates a stalled build or something wrong with the build itself.
Check the details on how to adjust your build configuration on: https://docs.travis-ci.com/user/common-build-problems/#Build-times-out-because-no-output-was-received
The build has been terminated

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)

[Aaron1011]

@GuillaumeGomez: A travis job seems to have randomly hung.

[Mark-Simulacrum]

@bors retry

[bors]

⌛ Testing commit e4fedf4 with merge ca463abdfee89227b46513db1cae24873401ada4...

[bors]

💔 Test failed - checks-travis

[rust-highfive]

The job arm-android 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.

[01:41:51] test vec::test_split_at_mut ... ok
[01:41:51] test vec::test_split_off ... ok
[01:41:51] test vec::test_splice_unbounded ... ok
[01:41:51] test vec::test_swap_remove_empty ... ok
[01:41:52] died due to signal 11
[01:41:52] 
[01:41:52] 
[01:41:52] command did not execute successfully: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage0/bin/cargo" "test" "--target" "arm-linux-androideabi" "-j" "4" "--release" "--locked" "--color" "always" "--features" "panic-unwind backtrace" "--manifest-path" "/checkout/src/libstd/Cargo.toml" "-p" "alloc" "--"
[01:41:52] expected success, got: exit code: 3
---
travis_time:end:0047c8e0:start=1549383719637788139,finish=1549383719654481604,duration=16693465
travis_fold:end:after_failure.3
travis_fold:start:after_failure.4
travis_time:start:0c8f1ed4
$ 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 --batch -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:110e7004
travis_time:start:110e7004
$ 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:0bd44166
$ 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)

[kennytm]

@bors retry #55861

[bors]

⌛ Testing commit e4fedf4 with merge 4b1e39b...

[bors]

☀️ Test successful - checks-travis, status-appveyor
Approved by: GuillaumeGomez
Pushing 4b1e39b to master...