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As suggested by Patrick Palka in the bug report, the diagnostic check for concept_check_p(fn) was being done too late in finish_call_expr(), which led to an early return inside if (processing_template_decl), which meant that the error wouldn't be triggered when we are in a type dependence early exit. This fix makes sure that this error is handled in the semantic analysis phase, and avoids the failed assertion later in tsubst_expr(). PR c++/116477 gcc/cp/ChangeLog: * semantics.cc (finish_call_expr): Move concept_check_p diagnostic before processing_template_decl check to catch errors earlier. gcc/testsuite/ChangeLog: * g++.dg/cpp2a/concepts-pr116477.C: New test. Signed-off-by: Egas Ribeiro <egas.g.ribeiro@tecnico.ulisboa.pt>
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