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Here we're failing to communicate to cp_finish_decl from tsubst_expr that we're in a copy-initialization context (via the LOOKUP_ONLYCONVERTING flag), which causes us to always consider explicit deduction guides when performing CTAD for a templated variable initializer. It turns out this bug also affects consideration of explicit conversion operators for the same reason. But consideration of explicit constructors seems unaffacted thanks to code in build_aggr_init that sets LOOKUP_ONLYCONVERTING when the initializer represents copy-initialization. So this patch fixes this by making cp_finish_decl set LOOKUP_ONLYCONVERTING just like build_aggr_init does, by inspecting the initializer, so that callers don't need to explicitly pass this flag appropriately. PR c++/102137 PR c++/87820 gcc/cp/ChangeLog: * cp-tree.h (is_copy_initialization): Declare. * decl.cc (cp_finish_decl): Set LOOKUP_ONLYCONVERTING when is_copy_initialization is true. * init.cc (build_aggr_init): Split out copy-initialization check into ... (is_copy_initialization): ... here. * pt.cc (instantiate_decl): Pass 0 instead of LOOKUP_ONLYCONVERTING as flags to cp_finish_decl. gcc/testsuite/ChangeLog: * g++.dg/cpp0x/explicit15.C: New test. * g++.dg/cpp1z/class-deduction108.C: New test.
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