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Implement new effects desugaring cc `@rust-lang/project-const-traits.` Will write down notes once I have finished. * [x] See if we want `T: Tr` to desugar into `T: Tr, T::Effects: Compat<true>` * [x] Fix ICEs on `type Assoc: ~const Tr` and `type Assoc<T: ~const Tr>` * [ ] add types and traits to minicore test * [ ] update rustc-dev-guide Fixes #119717 Fixes #123664 Fixes #124857 Fixes #126148
For high-level intro to how type checking works in rustc, see the type checking chapter of the rustc dev guide.