================
@@ -0,0 +1,46 @@
+// RUN: %clang_cc1 -triple x86_64-unknown-unknown %s -std=c++20 \
+// RUN: -fsyntax-only -ast-dump -ast-dump-filter test | FileCheck %s
+
+#include "Inputs/std-coroutine.h"
+
+using namespace std;
+
+struct Task {
+ struct promise_type {
+ std::suspend_always initial_suspend() { return {}; }
+ Task get_return_object() {
+ return std::coroutine_handle<promise_type>::from_promise(*this);
+ }
+ std::suspend_always final_suspend() noexcept { return {}; }
+ std::suspend_always return_void() { return {}; }
+ void unhandled_exception() {}
+
+ auto await_transform(int s) {
+ struct awaiter {
+ promise_type *promise;
+ bool await_ready() { return true; }
+ int await_resume() { return 1; }
+ void await_suspend(std::coroutine_handle<>) {}
+ };
+
+ return awaiter{this};
+ }
+ };
+
+ Task(std::coroutine_handle<promise_type> promise);
+
+ std::coroutine_handle<promise_type> handle;
+};
+
+// Verify the implicit AST nodes for coroutines.
+Task test() {
+ co_await 1;
+}
+// CHECK: |-DeclStmt {{.*}}
+// CHECK-NEXT: | `-VarDecl {{.*}} implicit used __promise
+// CHECK-NEXT: | `-CXXConstructExpr {{.*}}
+// CHECK-NEXT: |-ExprWithCleanups {{.*}} 'void'
+// CHECK-NEXT: | `-CoawaitExpr {{.*}} 'void' implicit
----------------
ilya-biryukov wrote:
Is this node implicit for initial suspend, for a call to `await_transform` or
both? It would be useful to clarify by matching some child nodes or the dump of
`CoawaitExpr` itself.
Also, could you add matching for both implicit and non-implicit `co_await` and
`co_return` instances to show that the bit does not incidentally gets set/unset
all the time?
Fixing `CoreturnStmt` in a follow-up does make a lot of sense!
https://github.com/llvm/llvm-project/pull/77311
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