based on Bounded Spec InstanceExec (Mauricio Fernandez) eigenclass.org/hiki/bounded+space+instance_exec
uses singleton_class of matcher instead of global InstanceExecHelper module
this keeps it scoped to this class only, which is the only place we need it
only necessary for ruby 1.8.6
# File lib/spec/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(:__instance_exec, &block) } ensure Thread.critical = orig_critical end begin return send(:__instance_exec, *args) ensure singleton_class.module_eval{ remove_method(:__instance_exec) } rescue nil end end
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