All operations on None should raise a NoneError, which should be a
TypeError for backwards compatibility.
try:
x = a[b][c][d][e][f] + g.foo(h)
except NoneError:
x = None
we can then look into merging the proposals of None-aware operators and
Exception-aware operators such that the Exception-aware operators
fallback to NoneError if no exception type is provided.
we should also look into making "except" default to using NoneError
instead of BaseException, with a future flag.
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