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hir_analysis: prohibit `dyn PointeeSized` Fixes rust-lang/rust#142652 Supersedes rust-lang/rust#142663 `dyn PointeeSized` is nonsensical as a `dyn PointeeSized` needs to be `MetaSized`, so lets reject it to avoid hitting code paths that expect a builtin impl for `PointeeSized` r? `@compiler-errors`
For high-level intro to how type checking works in rustc, see the type checking chapter of the rustc dev guide.