PR c++/89705 - ICE with reference binding with conversion function.

	* call.c (reference_binding): If the result of the conversion function
	is a prvalue of non-class type, use the cv-unqualified type.

	* g++.dg/cpp0x/rv-conv2.C: New test.

From-SVN: r269918

gcc/cp/ChangeLog

+2019-03-25  Marek Polacek  <polacek@redhat.com>
+
+	PR c++/89705 - ICE with reference binding with conversion function.
+	* call.c (reference_binding): If the result of the conversion function
+	is a prvalue of non-class type, use the cv-unqualified type.
+
 2019-03-25  Nathan Sidwell  <nathan@acm.org>
 
 	* lambda.c (maybe_add_lambda_conv_op): Don't add to comdat group.

gcc/cp/call.c

@@ -1853,6 +1853,9 @@ reference_binding (tree rto, tree rfrom, tree expr, bool c_cast_p, int flags,
 	    && DECL_CONV_FN_P (t->cand->fn))
 	  {
 	    tree ftype = TREE_TYPE (TREE_TYPE (t->cand->fn));
+	    /* A prvalue of non-class type is cv-unqualified.  */
+	    if (!TYPE_REF_P (ftype) && !CLASS_TYPE_P (ftype))
+	      ftype = cv_unqualified (ftype);
 	    int sflags = (flags|LOOKUP_NO_CONVERSION)&~LOOKUP_NO_TEMP_BIND;
 	    conversion *new_second
 	      = reference_binding (rto, ftype, NULL_TREE, c_cast_p,

gcc/testsuite/ChangeLog

+2019-03-25  Marek Polacek  <polacek@redhat.com>
+
+	PR c++/89705 - ICE with reference binding with conversion function.
+	* g++.dg/cpp0x/rv-conv2.C: New test.
+
 2019-03-25  Richard Biener  <rguenther@suse.de>
 
 	PR tree-optimization/89789

gcc/testsuite/g++.dg/cpp0x/rv-conv2.C

+// PR c++/89705
+// { dg-do compile { target c++11 } }
+
+struct W { operator const volatile int(); };
+const int& rci = W();
+
+struct X { operator const int(); };
+int&& rri = X();
+
+struct Y { operator volatile int(); };
+int&& rri2 = Y();
+
+struct Z { operator const volatile int(); };
+volatile int&& rri3 = Z();
+
+enum E { A };
+struct S { operator const E(); };
+E&& rre = S();