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Revert "Unify tcx.constness and param env constness checks" Too much of a perf regression https://github.com/rust-lang/rust/pull/102975#issuecomment-1282702513, and an attempt in #103263 didn't fix it except for just a tiny bit. This change isn't really needed (see https://github.com/rust-lang/rust/pull/102830#issuecomment-1272514096), so this should be an easy revert.
This directory contains the source code of the rust project, including:
- The test suite
- The bootstrapping build system
- Various submodules for tools, like cargo, etc.
For more information on how various parts of the compiler work, see the rustc dev guide.