https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112355
Bug ID: 112355
Summary: Internal compiler error when exporting using
declaration of function template
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: davidfromonline at gmail dot com
Target Milestone: ---
The following mostly valid code:
```cxx
module;
namespace n {
template<typename T>
void f() {
}
}
export module m;
export using n::f;
```
causes gcc to crash with
```console
<source>:3:1: error: global module fragment contents must be from preprocessor
inclusion
3 | namespace n {
| ^~~~~~~~~
<source>:13:17: internal compiler error: tree check: expected none of
template_decl, have template_decl in do_nonmember_using_decl, at
cp/name-lookup.cc:4853
13 | export using n::f;
| ^
0x8fbb6e tree_not_check_failed(tree_node const*, char const*, int, char const*,
...)
gcc/source/gcc/tree.cc:8986
0x76f1d4 tree_not_check(tree_node*, char const*, int, char const*, tree_code)
gcc/source/gcc/tree.h:3607
0x76f1d4 do_nonmember_using_decl
gcc/source/gcc/cp/name-lookup.cc:4853
0xb63549 finish_nonmember_using_decl(tree_node*, tree_node*)
gcc/source/gcc/cp/name-lookup.cc:6297
0xb6d974 finish_using_decl
gcc/source/gcc/cp/parser.cc:21908
0xbb482f cp_parser_using_declaration
gcc/source/gcc/cp/parser.cc:22072
0xbc8653 cp_parser_declaration
gcc/source/gcc/cp/parser.cc:15335
0xbc85d4 cp_parser_module_export
gcc/source/gcc/cp/parser.cc:15080
0xbc85d4 cp_parser_declaration
gcc/source/gcc/cp/parser.cc:15276
0xbc908a cp_parser_toplevel_declaration
gcc/source/gcc/cp/parser.cc:15356
0xbc908a cp_parser_translation_unit
gcc/source/gcc/cp/parser.cc:5218
0xbc908a c_parse_file()
gcc/source/gcc/cp/parser.cc:50627
0xd0f8e1 c_common_parse_file()
gcc/source/gcc/c-family/c-opts.cc:1278
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
```
See it live: http://desktop:10240/z/nj5q1b
(the crash still exists if the global module fragment comes from an #include, I
just made it this way to have a single-file reproduction)
