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bors f8d8ffa2eb Auto merge of #111029 - Nilstrieb:when-the-errs-are-too-big, r=petrochenkov 
Shrink `SelectionError` a lot

`SelectionError` used to be 80 bytes (on 64 bit). That's quite big. Especially because the selection cache contained `Result<_, SelectionError>. The Ok type is only 32 bytes, so the 80 bytes significantly inflate the size of the cache.

Most variants of the `SelectionError` seem to be hard errors, only `Unimplemented` shows up in practice (for cranelift-codegen, it occupies 23.4% of all cache entries). We can just box away the biggest variant, `OutputTypeParameterMismatch`, to get the size down to 16 bytes, well within the size of the Ok type inside the cache.
2023-05-11 08:43:38 +00:00
..
src Auto merge of #111029 - Nilstrieb:when-the-errs-are-too-big, r=petrochenkov 2023-05-11 08:43:38 +00:00
Cargo.toml Remove QueryEngine trait 2023-04-26 07:46:13 +02:00
messages.ftl Avoid ICEing miri on layout query cycles 2023-05-02 16:14:20 +00:00
README.md

README.md

For more information about how rustc works, see the rustc dev guide.