mame	2018-01-21 02:52:51 +0900 (Sun, 21 Jan 2018)

  New Revision: 61994

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=61994

  Log:
    ext/ripper/tools/dsl.rb: Use String#sub instead of delete_suffix
    
    It fails when baseruby is old.

  Modified files:
    trunk/ext/ripper/tools/dsl.rb
Index: ext/ripper/tools/dsl.rb
===================================================================
--- ext/ripper/tools/dsl.rb	(revision 61993)
+++ ext/ripper/tools/dsl.rb	(revision 61994)
@@ -55,7 +55,7 @@ class DSL https://github.com/ruby/ruby/blob/trunk/ext/ripper/tools/dsl.rb#L55
   end
 
   def add_event(event, args, qundef_check = false)
-    event = event.to_s.delete_suffix("!")
+    event = event.to_s.sub(/!\z/, "")
     @events[event] = args.size
     vars = []
     args.each do |arg|

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