| Issue |
61566
|
| Summary |
Pointless -Wundefined-internal warning from concept checks
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
timsong-cpp
|
```cpp
auto begin(auto&& r) {
return r.begin();
}
template<class T>
concept Range = requires (T t) { ::begin(t); };
namespace {
struct R {
int* begin();
};
}
static_assert(Range<R>);
```
Here, I'm just trying to check the concept; nothing is actually calling `::begin` or `R::begin`. Yet clang warns:
```
<source>:10:14: warning: function '(anonymous namespace)::R::begin' has internal linkage but is not defined [-Wundefined-internal]
int* begin();
^
<source>:2:14: note: used here
return r.begin();
^
```
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