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"Dirk Laurie" <>:
> Would allowing empty tuple and array literals
>    y = ()
>    x = []
> introduce an ambiguity?

I know I'm a bit slow but never saw the answer to your exact original question, so:

x=A[[]] becomes ambiguous (function call with empty string argument vs indexing with an empty tuple index)

If you treat () as {} and "", A() becomes ambiguous as well.

This is rather obvious so you must have found out by now, so sorry for the noise.

Best regards,