zyn0217 wrote:
So, here is the offending case:
```cpp
template <class>
concept True = true;
template <class... U>
using MeowMeow = decltype([]<True>(U...) {}.template operator()<char>(U()...));
void foo() {
using T = MeowMeow<char, int, long, unsigned>;
}
```
In this example, the lambda does not have the `TypeAliasTemplateDecl` where it
is defined as its DeclContext - the `TypeAliasTemplateDecl` / `TypeAliasDecl`
does not constitute a DeclContext. So, it's owned by TranslationUnitDecl. OTOH,
we will instantiate the lambda inside the function `foo()` and thus the
DeclContext of the instantiation is `foo()`, hence the discrepancy.
https://github.com/llvm/llvm-project/pull/96888
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