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6b9b0a0ce8
Reject `?Trait` bounds in various places where we unconditionally warned since 1.0 fixes #135730 fixes #135809 Also a breaking change, so let's see what crater says. This has been an unconditional warning since *before* 1.0
For high-level intro to how type checking works in rustc, see the type checking chapter of the rustc dev guide.