empty -package:vector -package:text package:ghc

An empty Graph.
The empty document, with no height and no width. empty is the identity for <>, <+>, $$ and $+$, and anywhere in the argument list for sep, hcat, hsep, vcat, fcat etc.
Construct an empty ModBreaks
An initial empty BlockAssignment
An empty stack map, with all slots available.
Create a FamInstEnv from Name indices. INVARIANTS: * The fs_tvs are distinct in each FamInst of a range value of the map (so we can safely unify them)