Add an assertion and a test case, in a fruitless attempt to track down an existing bug

llvm-svn: 81885

clang/lib/Sema/SemaTemplateDeduction.cpp

@@ -1244,6 +1244,9 @@ Sema::FinishTemplateArgumentDeduction(FunctionTemplateDecl *FunctionTemplate,
   if (!Specialization)
     return TDK_SubstitutionFailure;
 
+  assert(Specialization->getPrimaryTemplate()->getCanonicalDecl() == 
+         FunctionTemplate->getCanonicalDecl());
+  
   // If the template argument list is owned by the function template
   // specialization, release it.
   if (Specialization->getTemplateSpecializationArgs() == DeducedArgumentList)

clang/test/SemaTemplate/constructor-template.cpp

@@ -26,3 +26,23 @@ void test_X0(int i, float f) {
   
   X0 x0g(f, &i); // expected-error{{no matching constructor}}
 }
+
+template<typename T>
+struct X1 {
+  X1(const X1&);
+  template<typename U> X1(const X1<U>&);
+};
+
+template<typename T>
+struct Outer {
+  typedef X1<T> A;
+  
+  A alloc;
+  
+  explicit Outer(const A& a) : alloc(a) { }
+};
+
+void test_X1(X1<int> xi) {
+  Outer<int> oi(xi);
+  Outer<float> of(xi);
+}