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This patch makes the default case of unify accept LAMBDA_EXPR P/A pairs, which we can legitimately hit during alias CTAD guide overload resolution. We can also less legimitately hit this during partial specialization matching (likely IFNDR). I'm not totally sure if we want to handle them like any other non-deducible expression vs handling them separately (returning success iff they're ==). I couldn't come up with a testcase for which it mattered so I went the simpler route. PR c++/122318 PR c++/101670 gcc/cp/ChangeLog: * pt.cc (unify) <default>: Accept LAMBDA_EXPR. gcc/testsuite/ChangeLog: * g++.dg/cpp2a/lambda-targ20.C: New test. * g++.dg/cpp2a/lambda-targ21.C: New test. Reviewed-by: Jason Merrill <jason@redhat.com>
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