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07a47e0708
Previously, a `delay_span_bug` was isssued, failing normalization. This create a `TyKind::Error` in the signature, which caused `compare_predicate_entailment` to swallow its signature mismatch error, causing ICEs because no error was emitted.
For high-level intro to how type checking works in rustc, see the type checking chapter of the rustc dev guide.