1 files changed, 39 insertions, 0 deletions
diff --git a/clang/test/CXX/temp/temp.decls/temp.variadic/init-capture.cpp b/clang/test/CXX/temp/temp.decls/temp.variadic/init-capture.cpp
new file mode 100644
index 00000000000..4d5b6b47459
--- /dev/null
+++ b/clang/test/CXX/temp/temp.decls/temp.variadic/init-capture.cpp
@@ -0,0 +1,39 @@
+// RUN: %clang_cc1 -std=c++2a -verify %s
+
+namespace p3 {
+  void bar(...);
+  template <typename... Args> void foo(Args... args) {
+    (void)[... xs = args] {
+      bar(xs...);
+    };
+  }
+
+  void use() {
+    foo();
+    foo(1);
+  }
+}
+
+template<typename ...T> void f(T ...t) {
+  (void)[&...x = t] {
+    x; // expected-error {{unexpanded parameter pack 'x'}}
+  };
+
+  // Not OK: can't expand 'x' outside its scope.
+  weird((void)[&...x = t] {
+    return &x; // expected-error {{unexpanded parameter pack 'x'}}
+  }...         // expected-error {{does not contain any unexpanded}}
+  );
+
+  // OK, capture only one 'slice' of 'x'.
+  weird((void)[&x = t] {
+    return &x;
+  }...
+  );
+
+  // 'x' is not expanded by the outer '...', but 'T' is.
+  weird((void)[&... x = t] {
+    return T() + &x; // expected-error {{unexpanded parameter pack 'x'}}
+  }...               // expected-error {{does not contain any unexpanded}}
+  );
+}