[Clang] Clang incorrectly accepts invalid lambda in default argument that references function parameter #152467
Description
Generated by Fuzzer.
Clang accepts following invalid code which is rejected by GCC and MSVC.
It correctly rejects invalid lambda usage in function bodies (e.g., int i = [] { return i; }();), but incorrectly accepts the identical invalid pattern when used in default arguments.
Reproducer: https://godbolt.org/z/M3xeM5Mcn
Program
int g(int i = [] {
return i;
}()) {
return i;
}
int main() {
return g();
}