rsmith added inline comments.
================
Comment at: lib/Sema/TreeTransform.h:6802
+ return getDerived().RebuildDependentCoawaitExpr(
+ E->getKeywordLoc(), Result.get(), E->getOperatorCoawaitLookup());
+}
----------------
EricWF wrote:
> rsmith wrote:
> > You need to transform the UnresolvedLookupExpr here too. (Example: we might
> > have a function-local declaration of `operator co_await` that needs to be
> > transformed into the version in the instantiated function.)
> Ack. Fixed.
>
> Do you have an example that doesn't use a function-local definition? Since
> `operator co_await` cannot be defined locally.
It can't be defined locally, but it can be *declared* locally. Example:
```
template<typename T> future<void> f(T t) {
future<void> operator co_await(T);
co_await t;
}
struct X {};
auto x = f(X{});
```
... which would require that `future<void> operator co_await(X)` is defined
somewhere in the program.
https://reviews.llvm.org/D26057
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