resolve: Fix an ICE in import validation

[petrochenkov]

Fixes ICE reported in the comment #56596 (comment)

[rust-highfive]

r? @eddyb

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[petrochenkov]

Beta-nominating as a regression fix, the assert was introduced in stable Rust 1.31 (in #55884).

[estebank]

@bors r+

[bors]

📌 Commit ce73bc7 has been approved by estebank

[bors]

⌛ Testing commit ce73bc7 with merge 4a4fbac...

[bors]

💔 Test failed - status-travis

[rust-highfive]

The job dist-powerpc64-linux 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.

Building stage2 tool cargo (powerpc64-unknown-linux-gnu)
[01:19:59]  Downloading crates ...
[01:20:19] warning: spurious network error (2 tries remaining): [6] Couldn't resolve host name (Could not resolve host: crates.io)
[01:20:39] warning: spurious network error (1 tries remaining): [6] Couldn't resolve host name (Could not resolve host: crates.io)
[01:20:59] error: failed to download from `https://crates.io/api/v1/crates/openssl-src/111.1.0+1.1.1a/download`
[01:20:59] Caused by:
[01:20:59]   [6] Couldn't resolve host name (Could not resolve host: crates.io)
[01:20:59] command did not execute successfully: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage0/bin/cargo" "build" "--target" "powerpc64-unknown-linux-gnu" "-j" "4" "--release" "--locked" "--color" "always" "--manifest-path" "/checkout/src/tools/cargo/Cargo.toml" "--features" "rustc-workspace-hack/all-static" "--message-format" "json"
[01:20:59] expected success, got: exit code: 101
---
travis_time:end:132cef9b:start=1546068465120615133,finish=1546068465131081311,duration=10466178
travis_fold:end:after_failure.3
travis_fold:start:after_failure.4
travis_time:start:00d411d7
$ 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:2c32138e
travis_time:start:2c32138e
$ 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:04cdf13c
$ 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

[bors]

⌛ Testing commit ce73bc7 with merge d5175f4...

[bors]

☀️ Test successful - status-appveyor, status-travis
Approved by: estebank
Pushing d5175f4 to master...

[rust-highfive]

📣 Toolstate changed by #57160!

Tested on commit d5175f4.
Direct link to PR: #57160

🎉 rls on windows: test-fail → test-pass (cc @nrc @Xanewok, @rust-lang/infra).

[pietroalbini]

This doesn't apply to beta @petrochenkov:

error[E0609]: no field `blacklisted_binding` on type `&mut Resolver<'a, 'crateloader>`resolve                                                                                                                                                                           
   --> src/librustc_resolve/resolve_imports.rs:242:57
    |
242 |                 if let Some(blacklisted_binding) = self.blacklisted_binding {
    |                                                         ^^^^^^^^^^^^^^^^^^^

[petrochenkov]

@pietroalbini
Turns out c658d73 is a prerequisite.

It's also a prerequisite for #56759, so there's a good chance that it'll need to be backported anyway.

[petrochenkov]

Included into #57483