https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121423
Bug ID: 121423
Summary: [ICE] nested function leads to internal compiler
error: verify_gimple failed
Product: gcc
Version: 16.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: njuwy at smail dot nju.edu.cn
Target Milestone: ---
Compiler Explorer: https://godbolt.org/z/qoedo41Ma
The crash triggering program (compile with `gcc-16 -Os`):
```
void foo (int n){
struct S { int a[n]; };
struct S fn (void){
struct S s;
s.a[0] = 42;
return s;
}
struct S fn2 (void){
return fn ();
}
fn ();
fn2 ();
}
int main (void){
foo(3);
}
```
The crash output:
```
<source>: In function 'fn':
<source>:21:1: error: invalid conversion in return statement
21 | }
| ^
struct S
struct S
# VUSE <.MEM_13>
return <retval>;
during IPA pass: remove_symbols
<source>:21:1: internal compiler error: verify_gimple failed
0x254bbc5 diagnostics::context::diagnostic_impl(rich_location*,
diagnostics::metadata const*, diagnostics::option_id, char const*,
__va_list_tag (*) [1], diagnostics::kind)
???:0
0x2541466 internal_error(char const*, ...)
???:0
0x11f4ede verify_gimple_in_cfg(function*, bool, bool)
???:0
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
```
