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an internal change #212

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9 changes: 9 additions & 0 deletions gin/config.py
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Original file line number Diff line number Diff line change
Expand Up @@ -573,6 +573,15 @@ def _decorate_fn_or_cls(decorator,
"""
if not inspect.isclass(fn_or_cls): # pytype: disable=wrong-arg-types
return decorator(_ensure_wrappability(fn_or_cls))

try:
# We check if the class can be subclassed. Some built-in types
# can't be, and will raise a TypeError here. In this case,
# we fall back to treating `fn_or_cls` as a function.
type(fn_or_cls.__name__ + 'GinSubclass', (fn_or_cls,), {})
except TypeError:
return decorator(_ensure_wrappability(fn_or_cls))

cls = fn_or_cls
if avoid_class_mutation:
# This approach enables @gin.register and gin.external_configurable(), and
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