Merge pull request swiftlang#76028 from DougGregor/async-seq-test-debug-6.0

Author: DougGregor

test/Concurrency/async_sequence_existential.swift

@@ -1,4 +1,7 @@
+// RUN: mkdir -p %t
 // RUN: %target-swift-frontend  -disable-availability-checking %s -emit-sil -o /dev/null -verify
+// RUN: %target-swift-frontend  -disable-availability-checking %s -dump-ast > %t/ast.log 2>&1
+// RUN: cat %t/ast.log
 
 // RUN: %target-swift-frontend  -disable-availability-checking %s -dump-ast 2>&1 | %FileCheck %s
 
@@ -13,6 +16,7 @@ extension Error {
   func printMe() { }
 }
 
+// CHECK: "test(seq:)"
 func test(seq: any AsyncSequence) async {
   // CHECK: "error" interface type="any Error"
   do {