1 files changed, 38 insertions, 0 deletions
diff --git a/test/SemaCXX/constexpr-default-arg.cpp b/test/SemaCXX/constexpr-default-arg.cpp
new file mode 100644
index 000000000000..0cef4aa578af
--- /dev/null
+++ b/test/SemaCXX/constexpr-default-arg.cpp
@@ -0,0 +1,38 @@
+// RUN: %clang_cc1 -std=c++1y -S -o - -emit-llvm -verify %s
+
+namespace default_arg_temporary {
+
+constexpr bool equals(const float& arg = 1.0f) {
+  return arg == 1.0f;
+}
+
+constexpr const int &x(const int &p = 0) {
+  return p;
+}
+
+struct S {
+  constexpr S(const int &a = 0) {}
+};
+
+void test_default_arg2() {
+  // This piece of code used to cause an assertion failure in
+  // CallStackFrame::createTemporary because the same MTE is used to initilize
+  // both elements of the array (see PR33140).
+  constexpr S s[2] = {};
+
+  // This piece of code used to cause an assertion failure in
+  // CallStackFrame::createTemporary because multiple CXXDefaultArgExpr share
+  // the same MTE (see PR33140).
+  static_assert(equals() && equals(), "");
+
+  // Test that constant expression evaluation produces distinct lvalues for
+  // each call.
+  static_assert(&x() != &x(), "");
+}
+
+// Check that multiple CXXDefaultInitExprs don't cause an assertion failure.
+struct A { int &&r = 0; }; // expected-note 2{{default member initializer}}
+struct B { A x, y; };
+B b = {}; // expected-warning 2{{not supported}}
+
+}