[clang] [Clang] Fix a regression introduced by #138518 (PR #141342)

[via cfe-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: cor3ntin (cor3ntin)

<details>
<summary>Changes</summary>

We did not handle the case where a variable could be initialized by a CXXParenListInitExpr.

---
Full diff: https://github.com/llvm/llvm-project/pull/141342.diff


2 Files Affected:

- (modified) clang/lib/Sema/SemaDecl.cpp (+5-3) 
- (modified) clang/test/SemaCXX/paren-list-agg-init.cpp (+22) 


``````````diff
diff --git a/clang/lib/Sema/SemaDecl.cpp b/clang/lib/Sema/SemaDecl.cpp
index 90525f386468a..41eb7c797b37d 100644
--- a/clang/lib/Sema/SemaDecl.cpp
+++ b/clang/lib/Sema/SemaDecl.cpp
@@ -13783,9 +13783,11 @@ void Sema::AddInitializerToDecl(Decl *RealDecl, Expr *Init, bool DirectInit) {
         VDecl->getLocation(), DirectInit, Init);
 
     MultiExprArg Args = Init;
-    if (CXXDirectInit)
-      Args = MultiExprArg(CXXDirectInit->getExprs(),
-                          CXXDirectInit->getNumExprs());
+    if (auto *CXXDirectInit = dyn_cast<ParenListExpr>(Init))
+        Args = MultiExprArg(CXXDirectInit->getExprs(),
+                            CXXDirectInit->getNumExprs());
+    else if (auto *CXXDirectInit = dyn_cast<CXXParenListInitExpr>(Init))
+        Args = CXXDirectInit->getInitExprs();
 
     // Try to correct any TypoExprs in the initialization arguments.
     for (size_t Idx = 0; Idx < Args.size(); ++Idx) {
diff --git a/clang/test/SemaCXX/paren-list-agg-init.cpp b/clang/test/SemaCXX/paren-list-agg-init.cpp
index ba7dffdc1af9f..680fdcdbe7b1c 100644
--- a/clang/test/SemaCXX/paren-list-agg-init.cpp
+++ b/clang/test/SemaCXX/paren-list-agg-init.cpp
@@ -403,3 +403,25 @@ void test() {
     S<int>{}.f(); // beforecxx20-note {{requested here}}
 }
 }
+
+namespace GH72880_regression {
+struct E {
+    int i = 42;
+};
+struct G {
+  E e;
+};
+template <typename>
+struct Test {
+  void f() {
+    constexpr E e;
+    //FIXME: We should only warn one
+    constexpr G g(e); // beforecxx20-warning 2{{C++20 extension}}
+    static_assert(g.e.i == 42);
+  }
+};
+void test() {
+    Test<int>{}.f(); // beforecxx20-note {{requested here}}
+}
+
+}

``````````

</details>


https://github.com/llvm/llvm-project/pull/141342