re PR c++/64085 (ICE on C++14 lambda by-reference capture with an initializer)

/cp
2015-04-03  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/64085
	* lambda.c (add_capture): Use dependent_type_p for capture by
	reference too.

/testsuite
2015-04-03  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/64085
	* g++.dg/cpp1y/lambda-init13.C: New.

From-SVN: r221858

gcc/cp/ChangeLog

+2015-04-03  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	PR c++/64085
+	* lambda.c (add_capture): Use dependent_type_p for capture by
+	reference too.
+
 2015-04-02  Marek Polacek  <polacek@redhat.com>
 
 	PR c++/65642

gcc/cp/lambda.c

@@ -506,7 +506,7 @@ add_capture (tree lambda, tree id, tree orig_init, bool by_reference_p,
       if (by_reference_p)
 	{
 	  type = build_reference_type (type);
-	  if (!real_lvalue_p (initializer))
+	  if (!dependent_type_p (type) && !real_lvalue_p (initializer))
 	    error ("cannot capture %qE by reference", initializer);
 	}
       else

gcc/testsuite/ChangeLog

+2015-04-03  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	PR c++/64085
+	* g++.dg/cpp1y/lambda-init13.C: New.
+
 2015-04-03  Marek Polacek  <polacek@redhat.com>
 
 	* g++.dg/cpp0x/pr57101.C: Use proper type for size_t.

gcc/testsuite/g++.dg/cpp1y/lambda-init13.C

+// PR c++/64085
+// { dg-do compile { target c++14 } }
+
+template<typename T>
+struct reference_wrapper
+{
+  T& get() const noexcept;
+};
+
+template<class T>
+auto make_monad(reference_wrapper<T> arg) {
+  return [&captive = arg.get()](auto&&) { return 1; };
+}
+
+int main()
+{
+  make_monad(reference_wrapper<int&>());
+}