PR c++/88825 - ICE with bogus function return type deduction.

	* typeck.c (can_do_nrvo_p): Check error_mark_node.

	* g++.dg/cpp1y/auto-fn55.C: New test.

From-SVN: r267926

gcc/cp/ChangeLog

@@ -4,6 +4,9 @@
 	* decl2.c (maybe_emit_vtables): Check CLASSTYPE_LAZY_DESTRUCTOR.
 	Fix formatting.
 
+	PR c++/88825 - ICE with bogus function return type deduction.
+	* typeck.c (can_do_nrvo_p): Check error_mark_node.
+
 2019-01-14  Tom Honermann  <tom@honermann.net>
 
 	Implement P0482R5, char8_t: A type for UTF-8 characters and strings

gcc/cp/typeck.c

@@ -9343,6 +9343,8 @@ is_std_move_p (tree fn)
 static bool
 can_do_nrvo_p (tree retval, tree functype)
 {
+  if (functype == error_mark_node)
+    return false;
   if (retval)
     STRIP_ANY_LOCATION_WRAPPER (retval);
   tree result = DECL_RESULT (current_function_decl);

gcc/testsuite/ChangeLog

+2019-01-14  Marek Polacek  <polacek@redhat.com>
+
+	PR c++/88825 - ICE with bogus function return type deduction.
+	* g++.dg/cpp1y/auto-fn55.C: New test.
+
 2019-01-14  Jakub Jelinek  <jakub@redhat.com>
 
 	* g++.dg/cpp1z/feat-cxx1z.C: Add tests for

gcc/testsuite/g++.dg/cpp1y/auto-fn55.C

+// PR c++/88825
+// { dg-do compile { target c++14 } }
+
+auto f () -> auto *
+{
+  int t = 0;
+  return t; // { dg-error "unable to deduce" }
+}