[clang] [clang-tools-extra] [llvm] [clang]: reflection operator parsing for global namespace and primitive types (PR #164692)

[Daniel M. Katz via llvm-commits]

================
@@ -0,0 +1,60 @@
+// RUN: %clang_cc1 %s -std=c++26 -freflection -fsyntax-only -verify
+
+namespace a {
+struct X {
+    int y;
+    bool operator==(const X& other)
+    {
+        return y == other.y;
+    }
+};
+
+namespace b {
+    struct Y {};
+    int x;
+}
+
+template<typename T>
+struct Z{
+    template<typename U>
+    using type = U;
+};
+
+}
+
+int main()
+{
+    (void)(^^::);
+    (void)(^^void);
+    (void)(^^bool);
+    (void)(^^char);
+    (void)(^^signed char);
+    (void)(^^unsigned char);
+    (void)(^^short);
+    (void)(^^unsigned short);
+    (void)(^^int);
+    (void)(^^unsigned int);
+    (void)(^^long);
+    (void)(^^unsigned long);
+    (void)(^^long long);
+    (void)(^^float);
+    (void)(^^double);
+
+    // Not supported yet.
+    (void)^^a; // expected-error {{expected reflectable entity}}
+    (void)^^a::; // expected-error {{expected reflectable entity}}
----------------
katzdm wrote:

There might be room for a better diagnostic for this case, but I personally think it's fine for now, and we can always work on improving it later.

@erichkeane @cor3ntin Wdyt?

https://github.com/llvm/llvm-project/pull/164692