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dc9a08f535
Remove use of const traits (and `feature(effects)`) from stdlib The current uses are already unsound because they are using non-const impls in const contexts. We can reintroduce them by reverting the commit in this PR, after #120639 lands. Also, make `effects` an incomplete feature. cc `@rust-lang/project-const-traits` r? `@compiler-errors`
For high-level intro to how type checking works in rustc, see the type checking chapter of the rustc dev guide.