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When building the parameter mapping for an atomic constraint, find_template_parameters does not spot the template parameter within the conversion-type-id of a dependent conversion operator, which later leads to an ICE during substitution when looking up the missing template argument for this unnoticed template parameter. gcc/cp/ChangeLog: PR c++/94597 * pt.c (any_template_parm_r) <case IDENTIFIER_NODE>: New case. If this is a conversion operator, visit its TREE_TYPE. gcc/testsuite/ChangeLog: PR c++/94597 * g++.dg/cpp2a/concepts-conv2.C: New test.
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