Use Ripper for IRB

The debug option of IRB is deleted because it's just for IRB's pure Ruby
parser.

1 files changed, 0 insertions, 20 deletions

diff --git a/lib/irb/context.rb b/lib/irb/context.rb
index e8e6a118e6..f8a6009d17 100644
--- a/lib/irb/context.rb
+++ b/lib/irb/context.rb
@@ -101,7 +101,6 @@ module IRB
       if @echo.nil?
         @echo = true
       end
-      self.debug_level = IRB.conf[:DEBUG_LEVEL]
     end
 
     # The top-level workspace, see WorkSpace#main
@@ -211,10 +210,6 @@ module IRB
     #
     # A copy of the default <code>IRB.conf[:VERBOSE]</code>
     attr_accessor :verbose
-    # The debug level of irb
-    #
-    # See #debug_level= for more information.
-    attr_reader :debug_level
 
     # The limit of backtrace lines displayed as top +n+ and tail +n+.
     #
@@ -361,21 +356,6 @@ module IRB
       print "Do nothing."
     end
 
-    # Sets the debug level of irb
-    #
-    # Can also be set using the +--irb_debug+ command line option.
-    #
-    # See IRB@Command+line+options for more command line options.
-    def debug_level=(value)
-      @debug_level = value
-      RubyLex.debug_level = value
-    end
-
-    # Whether or not debug mode is enabled, see #debug_level=.
-    def debug?
-      @debug_level > 0
-    end
-
     def evaluate(line, line_no, exception: nil) # :nodoc:
       @line_no = line_no
       if exception