Slice a keyed list by its keys

list[low .. high], as a fold's or a for's list, is the items whose keys
are from low up to before high (a list keyed by a number), read by key:
distinct(l.item for l in lines[o * 16 .. o * 16 + 16] where
stock[l.item].quantity < t) reads one order's lines, whatever its test
does outside them. It compiles to Pure's sliced folds and walks; an empty
for over a slice still computes its keys. Two diagnostics and an app of
slices are checked.

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