import Unique
import ListSetOps
import Util
-import Maybes
import FastString
import Module
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Each data constructor C has two, and possibly up to four, Names associated with it:
- OccName Name space Name of
- ---------------------------------------------------------------------------
- * The "data con itself" C DataName DataCon
- * The "worker data con" C VarName Id (the worker)
- * The "wrapper data con" \$WC VarName Id (the wrapper)
- * The "newtype coercion" :CoT TcClsName TyCon
+ OccName Name space Name of Notes
+ ---------------------------------------------------------------------------
+ The "data con itself" C DataName DataCon In dom( GlobalRdrEnv )
+ The "worker data con" C VarName Id The worker
+ The "wrapper data con" $WC VarName Id The wrapper
+ The "newtype coercion" :CoT TcClsName TyCon
EVERY data constructor (incl for newtypes) has the former two (the
data con itself, and its worker. But only some data constructors have a
-- syntax, provided its type looks like the above.
-- The declaration format is held in the TyCon (algTcGadtSyntax)
- dcUnivTyVars :: [TyVar], -- Universally-quantified type vars
+ dcUnivTyVars :: [TyVar], -- Universally-quantified type vars [a,b,c]
-- INVARIANT: length matches arity of the dcRepTyCon
+ --- result type of (rep) data con is exactly (T a b c)
dcExTyVars :: [TyVar], -- Existentially-quantified type vars
-- In general, the dcUnivTyVars are NOT NECESSARILY THE SAME AS THE TYVARS