# File lib/active_support/core_ext/object/extending.rb, line 41 def instance_exec(*args, &block) begin old_critical, Thread.critical = Thread.critical, true n = 0 n += 1 while respond_to?(method_name = "__instance_exec#{n}") InstanceExecMethods.module_eval { define_method(method_name, &block) } ensure Thread.critical = old_critical end begin send(method_name, *args) ensure InstanceExecMethods.module_eval { remove_method(method_name) } rescue nil end end