[Bug c++/102536] New: [modules] ICE Error reporting routines re-entered

[johelegp at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102536

            Bug ID: 102536
           Summary: [modules] ICE Error reporting routines re-entered
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: johelegp at gmail dot com
                CC: johelegp at gmail dot com
  Target Milestone: ---

See https://godbolt.org/z/ehPzxqzWK.

mod.cpp:
```C++
export module mod;

namespace mod {

export struct X {
  X() { }

  constexpr void f() {
    [](auto) { }(0);
  }
};

}
```

test.cpp:
```C++
import mod;

int main() {
  mod::X{}.f();
}
```

```
Internal compiler error: Error reporting routines re-entered.
0x1fe6b9d error_at(unsigned int, char const*, ...)
        ???:0
0x989719 lazy_load_pendings(tree_node*)
        ???:0
0x994388 get_class_binding(tree_node*, tree_node*, bool)
        ???:0
0xa953ce dfs_walk_all(tree_node*, tree_node* (*)(tree_node*, void*), tree_node*
(*)(tree_node*, void*), void*)
        ???:0
0xa9558c lookup_member(tree_node*, tree_node*, int, bool, int,
access_failure_info*)
        ???:0
0x91b9aa lambda_function(tree_node*)
        ???:0
0x2003411 pp_format(pretty_printer*, text_info*)
        ???:0
0x2003a90 pp_format_verbatim(pretty_printer*, text_info*)
        ???:0
0x2003b71 pp_verbatim(pretty_printer*, char const*, ...)
        ???:0
0x1fe5b51 diagnostic_report_diagnostic(diagnostic_context*, diagnostic_info*)
        ???:0
0x1fe6b9d error_at(unsigned int, char const*, ...)
        ???:0
0x989719 lazy_load_pendings(tree_node*)
        ???:0
0x994388 get_class_binding(tree_node*, tree_node*, bool)
        ???:0
0xa953ce dfs_walk_all(tree_node*, tree_node* (*)(tree_node*, void*), tree_node*
(*)(tree_node*, void*), void*)
        ???:0
0xa9558c lookup_member(tree_node*, tree_node*, int, bool, int,
access_failure_info*)
        ???:0
0x91b9aa lambda_function(tree_node*)
        ???:0
0x93419b mangle_decl(tree_node*)
        ???:0
0x14c5f02 decl_assembler_name(tree_node*)
        ???:0
0xc70f8a cgraph_node::finalize_function(tree_node*, bool)
        ???:0
0x9873f8 module_state::read_cluster(unsigned int)
        ???:0
```