# File lib/rspec/mocks/extensions/instance_exec.rb, line 12 def instance_exec(*args, &block) singleton_class = (class << self; self; end) begin orig_critical, Thread.critical = Thread.critical, true n = 0 n += 1 while respond_to?(method_name="__instance_exec#{n}") singleton_class.module_eval{ define_method(method_name, &block) } ensure Thread.critical = orig_critical end begin return send(method_name, *args) ensure singleton_class.module_eval{ remove_method(method_name) } rescue nil end end