trans: callee: normalize trait_ref before use

[xen0n]

This fixes #33436 and #33461. Ran the tests and nothing else seems to be affected.

P.S. How to write the regression test for this fix? Does this qualify as run-pass or run-make, as the test only needs to be successfully compiled to be considered passed? Will add the testcase (the minimal example in #33461 seems fit) after clarifying this.

[rust-highfive]

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

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[eddyb]

r? @eddyb

Thanks for doing this 😄. As for the test, run-pass that compiles without ICE is enough.

[eddyb]

@bors r+

[bors]

📌 Commit dcdf761 has been approved by eddyb

[xen0n]

Added testcase and pushed.

(Reason why the Travis CI status is gone: I made a mistake of allowing 2 blank lines after copyright header in the testcase, which I summarily fixed and re-pushed; however Travis is quick enough to create a build for the replaced commit, and haven't created one for the current commit. As the difference is only one blank line the outcome shouldn't matter, but sorry for the extra noise.)

[bors]

⌛️ Testing commit dcdf761 with merge 32683ce...

[bors]

☀️ Test successful - auto-linux-32-nopt-t, auto-linux-32-opt, auto-linux-32cross-opt, auto-linux-64-cargotest, auto-linux-64-cross-armhf, auto-linux-64-cross-armsf, auto-linux-64-cross-freebsd, auto-linux-64-cross-netbsd, auto-linux-64-debug-opt, auto-linux-64-nopt-t, auto-linux-64-opt, auto-linux-64-opt-mir, auto-linux-64-opt-rustbuild, auto-linux-64-x-android-t, auto-linux-cross-opt, auto-linux-musl-64-opt, auto-mac-32-opt, auto-mac-64-nopt-t, auto-mac-64-opt, auto-mac-64-opt-rustbuild, auto-mac-cross-ios-opt, auto-win-gnu-32-nopt-t, auto-win-gnu-32-opt, auto-win-gnu-32-opt-rustbuild, auto-win-gnu-64-nopt-t, auto-win-gnu-64-opt, auto-win-msvc-32-cross-opt, auto-win-msvc-32-opt, auto-win-msvc-64-cargotest, auto-win-msvc-64-opt, auto-win-msvc-64-opt-mir, auto-win-msvc-64-opt-rustbuild

[nikomatsakis]

cc @rust-lang/compiler

[nikomatsakis]

approving for backport because this fixes a regression and is very simple