namedtuple syntax

[srittau]

We could add a check for namedtuple syntax. Warn about collections.namedtuple in stubs, possibly also about using the non-class syntax.

[AlexWaygood]

#97 means that it is now illegal to import namedtuple from collections or do import collections; collections.namedtuple.

@JelleZijlstra, does #76 mean the non-class syntax for typing.NamedTuple is also now disallowed? If so, I think we're done here :)

[JelleZijlstra]

@JelleZijlstra, does #76 mean the non-class syntax for typing.NamedTuple is also now disallowed?

I don't think so, we allow assignments with call nodes on the RHS because there are various odd cases where they're needed. In particular, we have some non-class TypedDict definitions that use keys like "in", because the class version would be a SyntaxError.