https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113649
Bug ID: 113649 Summary: ICE: nested template class template argument deduction Product: gcc Version: 14.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: schaumb at gmail dot com Target Milestone: --- The following code does not compile, see here https://godbolt.org/z/vz5KMzhsh: template<class ...Ts> struct params { template <typename Return> struct return_type { constexpr return_type(Return (*p1)(Ts...)){} }; template <typename Return> return_type(Return (*)(Ts...)) -> return_type<Return>; template<return_type Any> struct addr {}; }; void x(double); template struct params<double>::addr<&x>; It runs to internal compiler error: <source>:19:40: internal compiler error: in build_function_type, at tree.cc:7488 19 | template struct params<double>::addr<&x>; | ^ 0x2647edc internal_error(char const*, ...) ???:0 0xa51cb7 fancy_abort(char const*, int, char const*) ???:0 0xc72375 do_auto_deduction(tree_node*, tree_node*, tree_node*, int, auto_deduction_context, tree_node*, int, tree_node*) ???:0 0xc76223 coerce_template_parms(tree_node*, tree_node*, tree_node*, int, bool) ???:0 0xc93089 lookup_template_class(tree_node*, tree_node*, tree_node*, tree_node*, int, int) ???:0 0xccf8ff finish_template_type(tree_node*, tree_node*, int) ???:0 0xc53d2a c_parse_file() ???:0 0xda79a9 c_common_parse_file() ???:0 Please submit a full bug report, with preprocessed source (by using -freport-bug). Please include the complete backtrace with any bug report. See <https://gcc.gnu.org/bugs/> for instructions. Compiler returned: 1