Harmonize diagnostics for invalid reference binding

gcc/cp:

	* call.c (convert_like_real): Harmonize diagnostics for invalid
	reference binding.

gcc/testsuite:

	* call.c (convert_like_real): Harmonize diagnostics for invalid
	reference binding.
	* g++.dg/conversion/pr16333.C: Adjust dg-error regexp.
	* g++.dg/conversion/pr41426.C: Likewise.
	* g++.dg/conversion/pr66211.C: Likewise.
	* g++.dg/cpp1y/lambda-init9.C: Likewise.
	* g++.dg/init/ref8.C: Likewise.
	* g++.old-deja/g++.law/cvt20.C: Likewise.
	* g++.old-deja/g++.mike/p9732c.C: Likewise.

From-SVN: r239184

gcc/cp/ChangeLog

+2016-08-06  Jonathan Wakely  <jwakely@redhat.com>
+
+	* call.c (convert_like_real): Harmonize diagnostics for invalid
+	reference binding.
+
 2016-08-05 Martin Sebor  <msebor@redhat.com>
 
 	* constexpr.c (cxx_eval_store_expression): Remove hyphen from

gcc/cp/call.c

@@ -6710,15 +6710,15 @@ convert_like_real (conversion *convs, tree expr, tree fn, int argnum,
 	    tree extype = TREE_TYPE (expr);
 	    if (TYPE_REF_IS_RVALUE (ref_type)
 		&& lvalue_p (expr))
-	      error_at (loc, "cannot bind %qT lvalue to %qT",
-			extype, totype);
+	      error_at (loc, "cannot bind rvalue reference of type %qT to "
+                        "lvalue of type %qT", totype, extype);
 	    else if (!TYPE_REF_IS_RVALUE (ref_type) && !lvalue_p (expr)
 		     && !CP_TYPE_CONST_NON_VOLATILE_P (TREE_TYPE (ref_type)))
-	      error_at (loc, "invalid initialization of non-const reference of "
-			"type %qT from an rvalue of type %qT", totype, extype);
+	      error_at (loc, "cannot bind non-const lvalue reference of "
+			"type %qT to an rvalue of type %qT", totype, extype);
 	    else if (!reference_compatible_p (TREE_TYPE (totype), extype))
-	      error_at (loc, "binding %qT to reference of type %qT "
-			"discards qualifiers", extype, totype);
+	      error_at (loc, "binding reference of type %qT to %qT "
+			"discards qualifiers", totype, extype);
 	    else
 	      gcc_unreachable ();
 	    maybe_print_user_conv_context (convs);

gcc/testsuite/ChangeLog

+2016-08-06  Jonathan Wakely  <jwakely@redhat.com>
+
+	* g++.dg/conversion/pr16333.C: Adjust dg-error regexp.
+	* g++.dg/conversion/pr41426.C: Likewise.
+	* g++.dg/conversion/pr66211.C: Likewise.
+	* g++.dg/cpp1y/lambda-init9.C: Likewise.
+	* g++.dg/init/ref8.C: Likewise.
+	* g++.old-deja/g++.law/cvt20.C: Likewise.
+	* g++.old-deja/g++.mike/p9732c.C: Likewise.
+
 2016-08-05  Patrick Palka  <ppalka@gcc.gnu.org>
 
 	PR tree-optimization/18046

gcc/testsuite/g++.dg/conversion/pr16333.C

@@ -7,4 +7,4 @@ struct X {
 int a[3];
 X foo1 () { return a; }
 const X &foo2 () { return a; } // { dg-warning "returning reference to temporary" }
-X &foo3 () { return a; } // { dg-error "invalid initialization" }
+X &foo3 () { return a; } // { dg-error "cannot bind non-const lvalue ref" }

gcc/testsuite/g++.dg/conversion/pr41426.C

@@ -23,7 +23,7 @@ const A<float> &g3()
 A<float> &g4()
 {
    float f[] = {1.1f, 2.3f};
-   return f; // { dg-error "invalid initialization" }
+   return f; // { dg-error "cannot bind non-const lvalue ref" }
 }
 
 struct B

gcc/testsuite/g++.dg/conversion/pr66211.C

@@ -7,5 +7,5 @@ int main()
 {
   int x = 0;
   double y = 1;
-  f(1 > 0 ? x : y); // { dg-error "from an rvalue" }
+  f(1 > 0 ? x : y); // { dg-error "cannot bind .* to an rvalue" }
 }

gcc/testsuite/g++.dg/cpp1y/lambda-init9.C

@@ -2,5 +2,5 @@
 
 void f()
 {
-  [&x=1]{};   // { dg-error "cannot capture|invalid initialization" }
+  [&x=1]{};   // { dg-error "cannot capture|cannot bind non-const lvalue ref" }
 }

gcc/testsuite/g++.dg/init/ref8.C

@@ -6,5 +6,5 @@ A operator*(A, A);
 
 A& operator+=(A& a, const A& b)
 {
-   return a = a * b;            // { dg-error "non-const reference" }
+   return a = a * b;            // { dg-error "non-const lvalue reference" }
 }

gcc/testsuite/g++.old-deja/g++.law/cvt20.C

@@ -16,5 +16,5 @@ void f(const char *& x) // { dg-message "argument" }
 
 int main()
 {
-  f ("foo"); // { dg-error "invalid initialization" }
+  f ("foo"); // { dg-error "cannot bind non-const lvalue reference" }
 }

gcc/testsuite/g++.old-deja/g++.mike/p9732c.C

@@ -2,4 +2,4 @@
 // prms-id: 9732
 
 struct foo {};
-foo& x() { return foo(); }	// { dg-error "invalid init" } 
+foo& x() { return foo(); }	// { dg-error "cannot bind non-const lvalue" }