[Lldb-commits] [clang] [clang-tools-extra] [lldb] [clang] implement CWG1980 and CWG2064: instantiation-dependency improvements (PR #190495)

[via lldb-commits]

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@@ -6,11 +6,31 @@
 // RUN: %clang_cc1 -std=c++23 -fexceptions -fcxx-exceptions -pedantic-errors %s -verify-directives -verify=expected
 // RUN: %clang_cc1 -std=c++2c -fexceptions -fcxx-exceptions -pedantic-errors %s -verify-directives -verify=expected
 
-
+#if __cplusplus < 201103L
 // expected-no-diagnostics
+#endif
 
 namespace cwg3106 { // cwg3106: 2.7
 #if __cplusplus >= 201103L
 const char str[9] = R"(\u{1234})";
 #endif
 } // namespace cwg3106
+
+namespace cwg3179 { // cwg3179: 23 tentatively ready 2026-04-30
+#if __cplusplus >= 201103L
+  template<class> using void_t = void;
+  template<class T> struct S {
+    void f(void_t<T*>);
+    // expected-error at -1 {{'void' as parameter must not involve template parameters}}
+
+    using X = int(void_t<T*>);
+    // expected-error at -1 {{'void' as parameter must not involve template parameters}}
+  };
+  template<class T> void g(decltype((void)(T*)0));
+  // expected-error at -1 {{'void' as parameter must not involve template parameters}}
+#endif
+#if __cplusplus >= 202002L
+  template<class T> bool v = requires(void_t<T>) { true; };
+  // expected-error at -1 {{'void' as parameter must not involve template parameters}}
+#endif
+} // namespace cwg3159
----------------
h-vetinari wrote:

```suggestion
} // namespace cwg3179
```

https://github.com/llvm/llvm-project/pull/190495