| Issue |
170040
|
| Summary |
[clang] Clang trunk regression breaks SFINAE with zero-sized array template parameter
|
| Labels |
clang
|
| Assignees |
|
| Reporter |
forworldm
|
```C++
#include <cstdint>
#include <cstddef>
template<int N> struct Foo {
operator uint16_t() const noexcept requires(N == 2) {
return 0;
}
template<int I = 0, char (*)[(N == 8) || (I & 0)] = nullptr>
operator uint64_t() const noexcept {
return 0;
}
};
int main() {
Foo<2> foo;
std::size_t bar = foo;
return bar;
}
```
clang emits: `error: zero-length arrays are not permitted in C++`.
Earlier versions of Clang (up to 21) compiled the same code without issues.
see [godbolt](https://godbolt.org/z/P67TaT1WP)
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