got rid of warnings caused by stricter ruby 1.9.3 rules

lib/pry.rb

@@ -8,7 +8,6 @@ class Pry
   DEFAULT_HOOKS = {
     :before_session => proc do |out, target|
       # ensure we're actually in a method
-      meth_name = target.eval('__method__')
       file = target.eval('__FILE__')
 
       # /unknown/ for rbx

lib/pry/default_commands/input.rb

@@ -75,7 +75,7 @@ e.g amend-line puts 'hello again'   # no line number modifies immediately preced
             output.puts "Invalid method name: #{meth_name}."
             next
           end
-          code, code_type = code_and_code_type_for(meth)
+          code, _ = code_and_code_type_for(meth)
           next if !code
 
           range = opts.l? ? one_index_range_or_number(opts[:l]) : (0..-1)

lib/pry/default_commands/shell.rb

@@ -80,7 +80,7 @@ class Pry
           next
         end
 
-        contents, normalized_start_line, _ = read_between_the_lines(file_name, start_line, end_line)
+        contents, _, _ = read_between_the_lines(file_name, start_line, end_line)
         contents = syntax_highlight_by_file_type_or_specified(contents, file_name, opts[:type])
 
         if opts.l?

lib/pry/helpers/base_helpers.rb

@@ -73,7 +73,7 @@ class Pry
       end
 
       def highlight(string, regexp, highlight_color=:bright_yellow)
-        highlighted = string.gsub(regexp) { |match| "<#{highlight_color}>#{match}</#{highlight_color}>" }
+        string.gsub(regexp) { |match| "<#{highlight_color}>#{match}</#{highlight_color}>" }
       end
 
       # formatting

lib/pry/helpers/command_helpers.rb

@@ -290,7 +290,7 @@ class Pry
 
       def process_yardoc_tag(comment, tag)
         in_tag_block = nil
-        output = comment.lines.map do |v|
+        comment.lines.map do |v|
           if in_tag_block && v !~ /^\S/
             Pry::Helpers::Text.strip_color Pry::Helpers::Text.strip_color(v)
           elsif in_tag_block