[beta] backports #37549
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[beta] backports #37549
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There used to be only a global cache, which led to uncached calls to trait selection when there were type parameters. I'm running a check that there are no adverse performance effects. Fixes rust-lang#37106 (drop elaboration times are now ~half of borrow checking, so might still be worthy of optimization, but not critical).
This will make it easier for packagers to bootstrap rustc when they happen to have a bootstrap compiler with a slightly different version number. It's not ok for anything other than the build system to set this environment variable.
The `specializes()` function was trying to normalize the impl trait in an empty environment. This could lead to inexplicable failures.
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r? @Aatch (rust_highfive has picked a reviewer for you, use r? to override) |
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Oh, I'm also still testing this locally. |
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r=me when approved |
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Tests pass locally. |
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This is all outstanding backports for 1.13. Don't merge yet. Not all are accepted yet, nor tested on master. cc @rust-lang/compiler please review those noted below for acceptance.
impls_bound#37152After this beta is built we need to update master to pick up the new 1.13 cargo rev set in rust-lang-deprecated/rust-packaging#64.