[clang] [Clang][Parser] Have the depth of the abbreviated generic lambdas inside a requires clause differ from the surrounding generic lambda (PR #80656)

[Shafik Yaghmour via cfe-commits]

================
@@ -168,3 +168,30 @@ auto lambda4 = [] requires(sizeof(char) == 1){}; // 
expected-error {{expected bo
 #if __cplusplus <= 202002L
 // expected-warning@-2{{lambda without a parameter clause is a C++23 
extension}}
 #endif
+
+namespace GH78524 {
+
+template <typename T> T Foo;
+
+template <typename T> auto C(Foo<T>);
+
+template <typename T> struct D {
+  decltype(T()(C<T>)) Type;
+};
+
+template <typename T, typename U> D<T> G(T, U) { return {}; }
+
+struct E {};
+
+void F() {
+  G([]<typename T>
+//     ~~~~~~~~~~ T: 0,0
----------------
shafik wrote:

In these context of this PR these comments about depth make sense but for 
someone coming to this test outside of this context they won't. Can you add 
more "depth" to the comment :-)

https://github.com/llvm/llvm-project/pull/80656
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