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The following testcase ICEs, because we try to instantiate the PARM_DECLs of foo <int> twice, once when parsing ^^foo <int> and remember in a REFLECT_EXPR a PARM_DECL in there, later on regenerate_decl_from_template is called and creates new set of PARM_DECLs and changes DECL_ARGUMENTS (or something later on in that chain) to the new set. This means when we call parameters_of on ^^foo <int> later on, they won't compare equal to the earlier acquired ones, and when we do e.g. type_of or other operation on the old PARM_DECL where it needs to search the DECL_ARGUMENTS (DECL_CONTEXT (parm_decl)) list, it will ICE because it won't find it there. The following patch fixes it similarly to how duplicate_decls deals with those, by setting OLD_PARM_DECL_P flag on the old PARM_DECLs, so that before using reflections of those we search DECL_ARGUMENTS and find the corresponding new PARM_DECL. 2026-03-03 Jakub Jelinek <jakub@redhat.com> PR c++/124306 * pt.cc (regenerate_decl_from_template): Mark the old PARM_DECLs replaced with tsubst_decl result with OLD_PARM_DECL_P flag. * g++.dg/reflect/parameters_of8.C: New test.
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