c41f51aed3
The issue-0176 conformance gate was name-only, so an impl P for T with a mismatched return/param type (or arity) built a wrong-ABI thunk that silently miscompiled (exit 0, wrong value). firstUnimplementedMethod now validates arity (after self), each param type, and the return type against the protocol declaration, substituting protocol Self->concrete via resolveProtoTypeSubSelf (recurses through pointer/many-pointer/ optional/slice/array so []Self<->[]T match; conservative .unresolved for Self-in-generic-arg). Comparison is by structural formatTypeName (alias/module/spelling independent); typesClearlyDiffer skips when either side has an unresolved leaf at any depth, biasing against false-positives. Regressions: diagnostics/1201 (negative), protocols/0420 (positive, []Self param). Verified by 3+3 adversarial reviews (a mid-fix []Self false-positive was found and closed); suite 792/0.
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