Simplify the structure of field/thunk dependencies #960
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Follow-up of #940 (comment).
The dependencies of a recursive fields were represented with several different types:
Option<HashSet<Ident>>
,ThunkDeps
andFieldDeps
, corresponding to different stages of the pipeline. ThunkDeps also had redundant states (ThunkDeps::Empty
andThunkDeps::Know(deps)
ifdeps.is_empty()
).This commit simplifies the situation by committing to one type, and removing multiple states representing the same thing.