binding.pry inside unbound method that was removed from the classes

gistfile1.rb

$ cat pry-method-name.rb 
require 'rubygems'
require 'pry'

class A
  def self.generate_method(name)  
    define_method name do    
      binding.pry      
    end  
    m = instance_method name
    remove_method name   
    m
  end  
end

um = A.generate_method('foo').bind(A.new).call


$ ruby pry-method-name.rb 
pry-method-name.rb:7:in `method': undefined method `foo' for class `A' (NameError)
	from pry-method-name.rb:7:in `block in generate_method'
	from /home/kl-7/.rvm/gems/ruby-1.9.2-p290@global/gems/pry-0.9.7.4/lib/pry/method.rb:51:in `eval'
	from /home/kl-7/.rvm/gems/ruby-1.9.2-p290@global/gems/pry-0.9.7.4/lib/pry/method.rb:51:in `from_binding'
	from /home/kl-7/.rvm/gems/ruby-1.9.2-p290@global/gems/pry-0.9.7.4/lib/pry/default_commands/context.rb:141:in `block (2 levels) in <module:DefaultCommands>'
	from /home/kl-7/.rvm/gems/ruby-1.9.2-p290@global/gems/pry-0.9.7.4/lib/pry/command_set.rb:19:in `instance_exec'
	from /home/kl-7/.rvm/gems/ruby-1.9.2-p290@global/gems/pry-0.9.7.4/lib/pry/command_set.rb:19:in `call'
	from /home/kl-7/.rvm/gems/ruby-1.9.2-p290@global/gems/pry-0.9.7.4/lib/pry/command_set.rb:200:in `run_command'
	from /home/kl-7/.rvm/gems/ruby-1.9.2-p290@global/gems/pry-0.9.7.4/lib/pry/command_processor.rb:173:in `block in execute_command'
	from /home/kl-7/.rvm/gems/ruby-1.9.2-p290@global/gems/pry-0.9.7.4/lib/pry/command_processor.rb:172:in `catch'
	from /home/kl-7/.rvm/gems/ruby-1.9.2-p290@global/gems/pry-0.9.7.4/lib/pry/command_processor.rb:172:in `execute_command'
	from /home/kl-7/.rvm/gems/ruby-1.9.2-p290@global/gems/pry-0.9.7.4/lib/pry/command_processor.rb:143:in `process_commands'
	from /home/kl-7/.rvm/gems/ruby-1.9.2-p290@global/gems/pry-0.9.7.4/lib/pry/pry_instance.rb:346:in `process_line'
	from /home/kl-7/.rvm/gems/ruby-1.9.2-p290@global/gems/pry-0.9.7.4/lib/pry.rb:16:in `block in <class:Pry>'
	from /home/kl-7/.rvm/gems/ruby-1.9.2-p290@global/gems/pry-0.9.7.4/lib/pry/pry_instance.rb:113:in `call'
	from /home/kl-7/.rvm/gems/ruby-1.9.2-p290@global/gems/pry-0.9.7.4/lib/pry/pry_instance.rb:113:in `exec_hook'
	from /home/kl-7/.rvm/gems/ruby-1.9.2-p290@global/gems/pry-0.9.7.4/lib/pry/pry_instance.rb:152:in `repl_prologue'
	from /home/kl-7/.rvm/gems/ruby-1.9.2-p290@global/gems/pry-0.9.7.4/lib/pry/pry_instance.rb:183:in `repl'
	from /home/kl-7/.rvm/gems/ruby-1.9.2-p290@global/gems/pry-0.9.7.4/lib/pry/pry_class.rb:97:in `start'
	from /home/kl-7/.rvm/gems/ruby-1.9.2-p290@global/gems/pry-0.9.7.4/lib/pry/core_extensions.rb:20:in `pry'
	from pry-method-name.rb:7:in `block in generate_method'
	from pry-method-name.rb:15:in `call'
	from pry-method-name.rb:15:in `<main>'