StgRhsClosure freevar and argument name duplicates

[Csaba Hruska]

Hi,

Can StgRhsClosure's freevar list ([occ]) or argument list ([bndr]) contain
duplicates?

Cheers,
Csaba

data GenStgRhs bndr occ
  = StgRhsClosure
        CostCentreStack         -- CCS to be attached (default is
CurrentCCS)
        StgBinderInfo           -- Info about how this binder is used (see
below)
        *[occ]*                   -- non-global free vars; a list, rather
than
                                -- a set, because order is important
        !UpdateFlag             -- ReEntrant | Updatable | SingleEntry
        *[bndr]*                  -- arguments; if empty, then not a
function;
                                -- as above, order is important.
        (GenStgExpr bndr occ)   -- body
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