Index: lib/StaticAnalyzer/Core/ExprEngine.cpp
===================================================================
--- lib/StaticAnalyzer/Core/ExprEngine.cpp
+++ lib/StaticAnalyzer/Core/ExprEngine.cpp
@@ -460,7 +460,8 @@
                                             const CXXBindTemporaryExpr *BTE,
                                             const LocationContext *LC) {
   ConstructedObjectKey Key({BTE, /*IsElided=*/true}, LC);
-  assert(!State->contains<ObjectsUnderConstruction>(Key));
+  // FIXME: Currently the state might already contain the marker due to
+  // incorrect handling of temporaries bound to default parameters.
   return State->set<ObjectsUnderConstruction>(Key, UnknownVal());
 }
 
Index: test/Analysis/temporaries.cpp
===================================================================
--- test/Analysis/temporaries.cpp
+++ test/Analysis/temporaries.cpp
@@ -458,6 +458,21 @@
 #endif // TEMPORARY_DTORS
 }
 
+namespace default_param_elided_destructors {
+struct a {
+  ~a();
+};
+struct F {
+  a d;
+  F(char *, a = a());
+};
+void g() {
+  char h[1];
+  for (int i = 0;;)
+    F j(i ? j : h);
+}
+} // namespace default_param_elided_destructors
+
 void testStaticMaterializeTemporaryExpr() {
   static const Trivial &ref = getTrivial();
   clang_analyzer_eval(ref.value == 42); // expected-warning{{TRUE}}