https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121217
Bug ID: 121217
Summary: internal compiler error: Segmentation fault
comptypes_equiv_p since 15.1 with -std=c2x
Product: gcc
Version: 16.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: mario.rodriguezb1 at um dot es
Target Milestone: ---
ICE in program, if something is removed it disappears.
Program:
```
typedef union{
char *nordic_ref;
unsigned long long int bit_number;
enum PinMode mode : 2;
unsigned char value;
} s; typedef struct{
union{
char *nordic_ref;
unsigned long long int bit_number;
enum PinMode mode : 2;
unsigned char value;
} s;
}
```
Stack dump
```
<source>:13:9: internal compiler error: Segmentation fault
13 | } s;
| ^
0x2547d65 diagnostic_context::diagnostic_impl(rich_location*,
diagnostic_metadata const*, diagnostic_option_id, char const*, __va_list_tag
(*) [1], diagnostic_t)
???:0
0x2569a46 internal_error(char const*, ...)
???:0
0xa54207 comptypes_equiv_p(tree_node*, tree_node*)
???:0
0xa460c0 hash_table<c_struct_hasher, false,
xcallocator>::find_slot_with_hash(tree_node* const&, unsigned int,
insert_option)
???:0
0xa423e1 finish_struct(unsigned long, tree_node*, tree_node*, tree_node*,
c_struct_parse_info*, tree_node**)
???:0
0xaae9c8 c_parser_declspecs(c_parser*, c_declspecs*, bool, bool, bool, bool,
bool, bool, bool, c_lookahead_kind)
???:0
0xaae8e4 c_parser_declspecs(c_parser*, c_declspecs*, bool, bool, bool, bool,
bool, bool, bool, c_lookahead_kind)
???:0
0xacc7ce c_parse_file()
???:0
0xb4e6e9 c_common_parse_file()
???:0
```
To quickly reproduce:
https://godbolt.org/z/dKGhTxvcz
