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Re: list over the empty type





It is possible but it is hard to see how you might use it.
You could write:

T : TYPE
S : TYPE = {x : T | FALSE} % empty!!!
traces : TYPE = list[S]

The trouble is that you can never actually construct a non-null
list of this type.  The list type is not itself empty since
it contains null[S] but nothing else.

-Shankar