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# development
a

aloof-angle-91616

01/20/2019, 9:47 PM
also look at this beautiful error message for the failing case
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Exception: None of the registered union members matched the subject. declared union type: TypeConstraint(=UnionBase), union members: {TypeConstraint(=UnionA), TypeConstraint(=UnionB)}, subject: <pants_test.engine.test_scheduler.A object at 0x7fc240d85b90>