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In this testcase, we're crashing because the lookup of operator+ from within the generic lambda via lookup_name finds multiple bindings (C1::operator+ and C2::operator+) and returns a TREE_LIST thereof, something which op_unqualified_lookup (and push_operator_bindings) isn't prepared to handle. This patch extends op_unqualified_lookup and push_operator_bindings to handle such an ambiguous lookup result in the natural way. gcc/cp/ChangeLog: PR c++/97582 * name-lookup.c (op_unqualified_lookup): Handle an ambiguous lookup result by discarding it if the first element is a class-scope declaration, otherwise return it. (push_operator_bindings): Handle an ambiguous lookup result by doing push_local_binding on each element in the list. gcc/testsuite/ChangeLog: PR c++/97582 * g++.dg/cpp0x/lambda/lambda-template17.C: New test.
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