Iterate on DefId for variances and generics.

[cjgillot]

Split from #80347

[rust-highfive]

r? @oli-obk

(rust-highfive has picked a reviewer for you, use r? to override)

[cjgillot]

@bors try @rust-timer queue

[rust-timer]

Awaiting bors try build completion.

@rustbot label: +S-waiting-on-perf

[bors]

⌛ Trying commit 219f0420a7ccb62ef3a7972c7d5ad1d5363da95a with merge a34034dcdfcde56e525766fafd5e72544cee4422...

[bors]

☀️ Try build successful - checks-actions
Build commit: a34034dcdfcde56e525766fafd5e72544cee4422 (a34034dcdfcde56e525766fafd5e72544cee4422)

[rust-timer]

Queued a34034dcdfcde56e525766fafd5e72544cee4422 with parent 2ccf063, future comparison URL.

[rust-timer]

Finished benchmarking try commit (a34034dcdfcde56e525766fafd5e72544cee4422): comparison url.

Benchmarking this pull request likely means that it is perf-sensitive, so we're automatically marking it as not fit for rolling up. Please note that if the perf results are neutral, you should likely undo the rollup=never given below by specifying rollup- to bors.

Importantly, though, if the results of this run are non-neutral do not roll this PR up -- it will mask other regressions or improvements in the roll up.

@bors rollup=never
@rustbot label: +S-waiting-on-review -S-waiting-on-perf

[jackh726]

Slight increase in perf aside: I'm not really sure how I feel about this change :) It seems much less clear what's going on.

[oli-obk]

@bors try @rust-timer queue

[rust-timer]

Awaiting bors try build completion.

@rustbot label: +S-waiting-on-perf

[bors]

⌛ Trying commit fcd6f20 with merge 83dadca4f0a32393b3b65b611485b2b81cf09258...

[bors]

☀️ Try build successful - checks-actions
Build commit: 83dadca4f0a32393b3b65b611485b2b81cf09258 (83dadca4f0a32393b3b65b611485b2b81cf09258)

[rust-timer]

Queued 83dadca4f0a32393b3b65b611485b2b81cf09258 with parent 2aafe45, future comparison URL.

[rust-timer]

Finished benchmarking try commit (83dadca4f0a32393b3b65b611485b2b81cf09258): comparison url.

Benchmarking this pull request likely means that it is perf-sensitive, so we're automatically marking it as not fit for rolling up. Please note that if the perf results are neutral, you should likely undo the rollup=never given below by specifying rollup- to bors.

Importantly, though, if the results of this run are non-neutral do not roll this PR up -- it will mask other regressions or improvements in the roll up.

@bors rollup=never
@rustbot label: +S-waiting-on-review -S-waiting-on-perf

[oli-obk]

@bors r+

[bors]

📌 Commit fcd6f20 has been approved by oli-obk

[bors]

⌛ Testing commit fcd6f20 with merge 9d0446f...

[bors]

☀️ Test successful - checks-actions
Approved by: oli-obk
Pushing 9d0446f to master...