https://gcc.gnu.org/bugzilla/show_bug.cgi?id=127229
--- Comment #2 from eczbek.void at gmail dot com --- This might be reduced or related? https://godbolt.org/z/8PqK9snvs ``` void f(auto&& x) { (int)[:^^x:]; } int main() { f(0); } ``` ``` <source>: In instantiation of 'void f(auto:1&&) [with auto:1 = int]': <source>:6:3: required from here 6 | f(0); | ~^~~ <source>:2:9: internal compiler error: in implicit_conversion, at cp/call.cc:2248 2 | (int)[:^^x:]; | ^~~~~~~~~~~~ 0x2bde978 diagnostics::context::diagnostic_impl(rich_location*, diagnostics::metadata const*, diagnostics::option_id, char const*, __va_list_tag (*) [1], diagnostics::kind) ???:0 0x2bd35bb internal_error(char const*, ...) ???:0 0xb4a772 fancy_abort(char const*, int, char const*) ???:0 0xb83116 perform_direct_initialization_if_possible(tree_node*, tree_node*, bool, int) ???:0 0xeae1a7 build_functional_cast(unsigned long, tree_node*, tree_node*, int) ???:0 0xe0748d instantiate_decl(tree_node*, bool, bool) ???:0 0xe113fa instantiate_pending_templates(int) ???:0 0xc72cb8 c_parse_final_cleanups() ???:0 0xf35b98 c_common_parse_file() ???:0 /cefs/5d/5db0e07b14c59ff34f47a0ce_gcc-trunk-20260906/bin/../libexec/gcc/x86_64-linux-gnu/17.0.0/cc1plus -quiet -imultiarch x86_64-linux-gnu -iprefix /cefs/5d/5db0e07b14c59ff34f47a0ce_gcc-trunk-20260906/bin/../lib/gcc/x86_64-linux-gnu/17.0.0/ -D_GNU_SOURCE <source> -quiet -dumpdir /app/ -dumpbase output.cpp -dumpbase-ext .cpp -masm=intel -mtune=generic -march=x86-64 -g -std=c++26 -fdiagnostics-color=always -fno-verbose-asm -freflection -o /app/output.s ```
