https://gcc.gnu.org/bugzilla/show_bug.cgi?id=128121
Bug ID: 128121
Summary: internal compiler error: in tree_node, at cp/module.cc
Product: gcc
Version: 17.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: 0599jiangyc at gmail dot com
Target Milestone: ---
The following code:
```cpp
export module M;
static union { int i; };
int &r = i;
```
Output:
```
<source>:1:8: internal compiler error: in tree_node, at cp/module.cc:10363
1 | export module M;
| ^~~~~~
0x2c69d98 diagnostics::context::diagnostic_impl(rich_location*,
diagnostics::metadata const*, diagnostics::option_id, char const*,
__va_list_tag (*) [1], diagnostics::kind)
???:0
0x2c5e9db internal_error(char const*, ...)
???:0
0xb9c512 fancy_abort(char const*, int, char const*)
???:0
0xd4f43b depset::hash::find_dependencies(module_state*)
???:0
0xd4fb61 module_state::write_begin(elf_out*, cpp_reader*, module_state_config&,
unsigned int&)
???:0
0xd516a4 finish_module_processing(cpp_reader*)
???:0
0xcc6f80 c_parse_final_cleanups()
???:0
0xf8b608 c_common_parse_file()
???:0
/cefs/b2/b23b881c7b2b30ba33960fa9_gcc-trunk-20261023/bin/../libexec/gcc/x86_64-linux-gnu/17.0.0/cc1plus
-quiet -imultiarch x86_64-linux-gnu -iprefix
/cefs/b2/b23b881c7b2b30ba33960fa9_gcc-trunk-20261023/bin/../lib/gcc/x86_64-linux-gnu/17.0.0/
-D_GNU_SOURCE <source> -quiet -dumpdir /app/output.s- -dumpbase example.cpp
-dumpbase-ext .cpp -mtune=generic -march=x86-64 -g -std=c++20
-fdiagnostics-color=always -fno-verbose-asm -fmodules -o /tmp/ccdkS11e.s
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.
x86-64 gcc (trunk) - 876ms
```
Trunk: https://godbolt.org/z/vcGq6e4q6
Found by https://github.com/fusion-fuzz/fusion-fuzz
