Use IRB::InputMethod#eof? to quit

lib/irb/input-method.rb

@@ -260,7 +260,7 @@ module IRB
     #
     # See IO#eof? for more information.
     def eof?
-      @eof
+      super
     end
 
     # Whether this input method is still readable when there is no more data to

lib/irb/ruby-lex.rb

@@ -98,7 +98,7 @@ class RubyLex
             @line.force_encoding(@io.encoding)
             yield @line, @exp_line_no
           end
-          break unless l
+          break if @io.eof?
           @line = ''
           @exp_line_no = @line_no