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d k r¥ e ƒ n d S( s? Tracing metaclass.
XXX This is very much a work in progress.
iÿÿÿÿNt TraceMetaClassc B s> e Z d Z d Z d „ Z d „ Z d „ Z d „ Z d Z RS( sU Metaclass for tracing.
Classes defined using this metaclass have an automatic tracing
feature -- by setting the __trace_output__ instance (or class)
variable to a file object, trace messages about all calls are
written to the file. The trace formatting can be changed by
defining a suitable __trace_call__ method.
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