Ilya Biryukov d02786e778
[Sema] Handle AttributedType in template deduction with derived-to-base conversions (#134361)
Fix #134356.

We accidentally skipped checking derived-to-base conversions because
deduction did not strip sugar in the relevant code. This caused
deduction failures when a parameter type had an attribute.
2025-04-04 14:23:55 +02:00
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