[cfe-dev] Is it possible to tell if function CallExpr/DeclRefExpr is resolved with ADL?

[Eric Liu via cfe-dev]

Example:
```
namespace nx {
class X {};
void ff(X &x) {}
}  // namespace nx

int main() {
  nx::X x;
  ff(x);   // ADL
}
```

I am wondering if this is possible given the reference expression and the
ASTContext.

Thanks,
Eric
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