[clang] [coroutines] Introduce [[clang::coro_return_type]] and [[clang::coro_wrapper]] (PR #71945)

[Utkarsh Saxena via cfe-commits]

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@@ -15811,6 +15813,20 @@ static void diagnoseImplicitlyRetainedSelf(Sema &S) {
           << FixItHint::CreateInsertion(P.first, "self->");
 }
 
+void Sema::CheckCoroutineWrapper(FunctionDecl *FD) {
+  if (!FD || getCurFunction()->isCoroutine())
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usx95 wrote:

`getCurFunction()` returns the function scope info which contains information about the processed function body being a coroutine or not. FD and getCurFunction() refers to the same function (one is decl and the other is FSI).

I will add a lambda inside a coroutine test to clarify.

https://github.com/llvm/llvm-project/pull/71945