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Kirill Smelkov authored
Python3 chains exceptions, so that e.g. if exc1 is raised and, while it was not handled, another exc2 is raised, exc2 will be linked to exc1 via exc2.__context__ attribute and exc1 will be included into exc2 traceback printout. However many projects still use Python2 and there is no similar chaining functionality there. This way exc1 is completely lost. Since defer code is in our hands, we can teach it to implement exception chaining even on Python2 by carefully analyzing what happens in _GoFrame.__exit__(). Implementing chaining itself is relatively easy, but is only part of the story. Even if an exception is chained with its cause, but exception dump does not show the cause, the chaining will be practically useless. With this in mind this patches settles not only on implementing chaining itself, but on also giving a promise that chained cause exceptions will be included into traceback dumps as well. To realize this promise we adjust a...
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