https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123667
Bug ID: 123667
Summary: [14/15/16 Regression] ICE in finish_decltype_type when
using decltype on a structured binding inside a
generic lambda
Product: gcc
Version: 16.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: jirehguo at tju dot edu.cn
Target Milestone: ---
Compiler Explorer: https://godbolt.org/z/neeorTncs
The following c++ code crash gcc trunk.
Goes back to 14.1 with checking.
Clang and gcc 13.4 accept it.
Code:
```cpp
#include <iostream>
int main() {
auto [x, y] = std::tuple<int, int>{0, 2};
[]<typename T>(T t) {
using z = decltype(x);
}(std::make_tuple(x, y));
}
```
Stack dump:
```
<source>: In lambda function:
<source>:5:27: internal compiler error: in finish_decltype_type, at
cp/semantics.cc:13065
5 | using z = decltype(x);
| ^
0x2950a78 diagnostics::context::diagnostic_impl(rich_location*,
diagnostics::metadata const*, diagnostics::option_id, char const*,
__va_list_tag (*) [1], diagnostics::kind)
???:0
0x294583b internal_error(char const*, ...)
???:0
0xb1ec34 fancy_abort(char const*, int, char const*)
???:0
0xd64c03 c_parse_file()
???:0
0xeeed49 c_common_parse_file()
???: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
```
