[beta] backports #77490
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[beta] backports #77490
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This fixes rust-lang#72408. Nested closures were resulting in exponential compilation time. As a performance optimization this change introduces MiniSet, which is a simple small storage optimized set.
Mostly to fix ui/issues/issue-37311-type-length-limit/issue-37311.rs. Most parts of the compiler can handle deeply nested types with a lot of duplicates just fine, but some parts still attempt to naively traverse type tree. Before such problems were caught by type length limit check, but now these places will have to be changed to handle duplicated types gracefully.
This makes everything about 1% faster in rustc-perf, mostly negating performance hit of previous commit.
See GitHub's blog post on why the change was necessary:
https://github.blog/changelog/2020-10-01-github-actions-deprecating-set-env-and-add-path-commands/
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I am going to go ahead and land this -- it contains some unapproved backports, but:
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@bors r+ rollup=never p=5 |
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📌 Commit bf38fa5 has been approved by |
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☀️ Test successful - checks-actions, checks-azure |
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This backports a number of PRs to beta, not all of which have been approved (yet).
r? @Mark-Simulacrum