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diff -Naur marshmallow-2.11.1.orig/marshmallow/schema.py test/marshmallow/schema.py
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--- marshmallow-2.11.1.orig/marshmallow/schema.py	2017-01-08 22:23:48.000000000 +0100
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+++ test/marshmallow/schema.py	2018-09-21 15:24:08.994234083 +0200
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@@ -17,7 +17,7 @@
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 from marshmallow.compat import (with_metaclass, iteritems, text_type,
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                                 binary_type, OrderedDict)
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 from marshmallow.exceptions import ValidationError
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-from marshmallow.orderedset import OrderedSet
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+from ordered_set import OrderedSet
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 from marshmallow.decorators import (PRE_DUMP, POST_DUMP, PRE_LOAD, POST_LOAD,
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                                     VALIDATES, VALIDATES_SCHEMA)
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 from marshmallow.utils import missing