https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100109
Bug ID: 100109 Summary: ICE: unexpected expression 'E' of kind template_parm_index Product: gcc Version: 11.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: hewillk at gmail dot com Target Milestone: --- https://godbolt.org/z/Go1W7YrYs template <int... E> void f() { [] { enum e { e = E }; }; } template void f<>(); <source>:3:13: internal compiler error: unexpected expression 'E' of kind template_parm_index 3 | [] { enum e { e = E }; }; | ^ 0x1d02849 internal_error(char const*, ...) ???:0 0x7a74bd build_enumerator(tree_node*, tree_node*, tree_node*, tree_node*, unsigned int) ???:0 0x92c3c8 lookup_template_class(tree_node*, tree_node*, tree_node*, tree_node*, int, int) ???:0 0x9182fd tsubst(tree_node*, tree_node*, int, tree_node*) ???:0 0x9183a7 tsubst(tree_node*, tree_node*, int, tree_node*) ???:0 0x94b882 tsubst_lambda_expr(tree_node*, tree_node*, int, tree_node*) ???:0 0x91e1df instantiate_decl(tree_node*, bool, bool) ???:0 0x9600bb instantiate_pending_templates(int) ???:0 0x7cd579 c_parse_final_cleanups() ???:0 Please submit a full bug report, with preprocessed source if appropriate.