2022-01-18  Jakub Jelinek  <jakub@redhat.com>

	PR c++/104025
	* parser.cc (cp_parser_id_expression): Save and restore input_location
	around cp_parser_skip_entire_template_parameter_list call for
	-Wmissing-template-keyword.

	* g++.dg/warn/pr104025.C: New test.

--- gcc/cp/parser.cc.jj	2022-01-17 18:05:04.797307506 +0100
+++ gcc/cp/parser.cc	2022-01-17 20:27:33.642711859 +0100
@@ -6254,6 +6254,7 @@ cp_parser_id_expression (cp_parser *pars
 			     OPT_Wmissing_template_keyword))
     {
       saved_token_sentinel toks (parser->lexer, STS_ROLLBACK);
+      iloc_sentinel ils (UNKNOWN_LOCATION);
       if (cp_parser_skip_entire_template_parameter_list (parser)
 	  /* An operator after the > suggests that the > ends a
 	     template-id; a name or literal suggests that the > is an
--- gcc/testsuite/g++.dg/warn/pr104025.C.jj	2022-01-17 20:31:17.320591249 +0100
+++ gcc/testsuite/g++.dg/warn/pr104025.C	2022-01-17 20:31:09.068706373 +0100
@@ -0,0 +1,20 @@
+// PR c++/104025
+// { dg-do compile }
+// { dg-options "-Wmissing-template-keyword -fcompare-debug" }
+
+void bar (int);
+
+struct S { int i; };
+
+template <class C>
+struct T
+{
+  int m;
+  C c;
+  void foo ()
+  {
+    bar (c.i < m);
+  }
+};
+
+template void T<S>::foo ();