[PATCH] D25078: [Coroutines] Diagnose when 'main' is declared as a coroutine.

[Gor Nishanov via cfe-commits]

GorNishanov added inline comments.


> DiagnosticSemaKinds.td:8569
>    "'%0' cannot be used in a varargs function">;
>  def ext_coroutine_without_co_await_co_yield : ExtWarn<
>    "'co_return' used in a function "

I am wondering, if we can handle all four cases when function can be a 
coroutine.

co_await
co_yield
co_return
for co_await

future<int> f() { co_return 42; } // is a valid coroutine per P0057R5

https://reviews.llvm.org/D25078



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