[clang] dc78a52 - [clang][NFC] Mark CWG1336 as implemented and add a test (#196000)

[via cfe-commits]

Author: Victor Chernyakin
Date: 2026-05-06T07:02:40-07:00
New Revision: dc78a5281539056dba23c823576a70d2661ad972

URL: https://github.com/llvm/llvm-project/commit/dc78a5281539056dba23c823576a70d2661ad972
DIFF: https://github.com/llvm/llvm-project/commit/dc78a5281539056dba23c823576a70d2661ad972.diff

LOG: [clang][NFC] Mark CWG1336 as implemented and add a test (#196000)

[CWG1336](https://wg21.link/cwg1336) clarifies that, as long as it isn't
explicit, a constructor is still a converting constructor even if it has
multiple arguments. Clang seems to implement this since 3.1:
https://godbolt.org/z/919zdMd3h (I checked a few versions following 3.1
as well, and didn't notice any regressions).

Added: 
    

Modified: 
    clang/test/CXX/drs/cwg13xx.cpp
    clang/www/cxx_dr_status.html

Removed: 
    


################################################################################
diff  --git a/clang/test/CXX/drs/cwg13xx.cpp b/clang/test/CXX/drs/cwg13xx.cpp
index a26586408231a..8e33fc98301d2 100644
--- a/clang/test/CXX/drs/cwg13xx.cpp
+++ b/clang/test/CXX/drs/cwg13xx.cpp
@@ -296,6 +296,25 @@ namespace cwg1330 { // cwg1330: 4 c++11
 
 // cwg1334: sup 1719
 
+namespace cwg1336 { // cwg1336: 3.1
+#if __cplusplus >= 201103L
+struct A {
+  A(int, int);
+};
+
+struct B {
+  explicit B(int, int); // #cwg1336-B-ctor
+};
+
+void f() {
+  A a = {1, 2};
+  B b = {1, 2};
+  // expected-error at -1 {{chosen constructor is explicit in copy-initialization}}
+  //   expected-note@#cwg1336-B-ctor {{explicit constructor declared here}}
+}
+#endif
+} // namespace cwg1336
+
 namespace cwg1340 { // cwg1340: 2.9
 struct A;
 struct B;

diff  --git a/clang/www/cxx_dr_status.html b/clang/www/cxx_dr_status.html
index c3571b59ba874..b881cfbc5002e 100755
--- a/clang/www/cxx_dr_status.html
+++ b/clang/www/cxx_dr_status.html
@@ -9129,7 +9129,7 @@ <h2 id="cxxdr">C++ defect report implementation status</h2>
     <td>[<a href="https://wg21.link/class.conv.ctor">class.conv.ctor</a>]</td>
     <td>CD3</td>
     <td>Definition of “converting constructor”</td>
-    <td class="unknown" align="center">Unknown</td>
+    <td class="full" align="center">Clang 3.1</td>
   </tr>
   <tr id="1337">
     <td><a href="https://cplusplus.github.io/CWG/issues/1337.html">1337</a></td>