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coveralls-python

More flexible resolution of import and require symbols  (#547)

This commit introduces the concept of a "context boundary" Symbol Table into the analyzer. Such Symbol Tables are defined at the top level of execution contexts such as modules (namespaces), functions (sync and async), and methods. Because imports are globally available once they have been called, we hoist imported symbols to the nearest context boundary Symbol Table, which is considerably different from the standard `let` style case, where a name becomes unavailable after it goes out of scope.

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