re PR c++/84537 (ICE in get_string, at spellcheck-tree.h)

	PR c++/84537
	* name-lookup.c (suggest_alternative_in_explicit_scope): Return false
	if name is error node.

	* g++.dg/parse/error60.C: New test.

From-SVN: r257988

gcc/cp/ChangeLog

+2018-02-26  Marek Polacek  <polacek@redhat.com>
+
+	PR c++/84537
+	* name-lookup.c (suggest_alternative_in_explicit_scope): Return false
+	if name is error node.
+
 2018-02-25  Jason Merrill  <jason@redhat.com>
 
 	PR c++/84015 - ICE with class deduction and auto template parm.

gcc/cp/name-lookup.c

@@ -5541,6 +5541,10 @@ bool
 suggest_alternative_in_explicit_scope (location_t location, tree name,
 				       tree scope)
 {
+  /* Something went very wrong; don't suggest anything.  */
+  if (name == error_mark_node)
+    return false;
+
   /* Resolve any namespace aliases.  */
   scope = ORIGINAL_NAMESPACE (scope);
 

gcc/testsuite/ChangeLog

+2018-02-26  Marek Polacek  <polacek@redhat.com>
+
+	PR c++/84537
+	* g++.dg/parse/error60.C: New test.
+
 2018-02-26  Jakub Jelinek  <jakub@redhat.com>
 
 	PR c++/84556

gcc/testsuite/g++.dg/parse/error60.C

+// PR c++/84537
+// { dg-do compile }
+
+namespace N
+{
+  template<int> struct A {};
+}
+
+N::template A<> a; // { dg-error "" }