src/Pure/Tools/check_keywords.scala

--- a/src/Pure/Tools/check_keywords.scala	Sun May 14 17:00:57 2017 +0200
+++ b/src/Pure/Tools/check_keywords.scala	Sun May 14 17:01:05 2017 +0200
@@ -46,9 +46,8 @@
       }, parallel_args).flatten
 
     for ((tok, pos) <- bad) {
-      progress.echo(Output.warning_text(
-        "keyword conflict: " + tok.kind.toString + " " + quote(tok.content) +
-          Position.here(pos)))
+      progress.echo_warning(
+        "keyword conflict: " + tok.kind.toString + " " + quote(tok.content) + Position.here(pos))
     }
   }
 }