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Oh, and it becomes thread-safer (Score:1)
Either I didn't think of it at the time of blogging, or I forgot about it, but another nice thing about using contextuals rather than instance attributes is that the class becomes thread-safe. In other words, you can suddenly use the same instance of Yapsi::Compiler to compile two different sources simultaneously. The contextuals will be local to each thread and not interact; instance attributes would have been shared and cause a bit of trouble.
Yapsi::Compiler currently only has one instance attribute: @.warnings -- this is so that one can query the object for warnings after compilation. Maybe we should factor this one out into a result object of some sort, returned from the .compile method. But, meh; YAGNI.
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