lib/rbs/annotate/formatter.rb in rbs-2.6.0 vs lib/rbs/annotate/formatter.rb in rbs-2.7.0.pre.1

@@ -1,21 +1,23 @@
+# frozen_string_literal: true
+
 module RBS
   module Annotate
     class Formatter
       attr_reader :buffer
 
       def initialize()
-        @buffer = ""
+        @buffer = +""
         @pending_separator = nil
       end
 
       def <<(s)
         if s
           if s.is_a?(RDoc::Markup::Document)
             s = self.class.translate(s) or raise
           end
 
-          s.rstrip!
+          s = s.rstrip
 
           unless s.empty?
             if ss = @pending_separator
               buffer << ss
               buffer << "\n"