X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=compiler%2FhsSyn%2FHsBinds.lhs;h=83273f0ca6424f22dcd2ed518b767abf222e76f2;hb=a76ba381f76fd9a5178e815206466a97dab46f75;hp=86622be1c622aa1f736b9279f403c19e6fed4e09;hpb=8bd508666b93f26f8790f408f82ac1ce0398cd04;p=ghc-hetmet.git diff --git a/compiler/hsSyn/HsBinds.lhs b/compiler/hsSyn/HsBinds.lhs index 86622be..83273f0 100644 --- a/compiler/hsSyn/HsBinds.lhs +++ b/compiler/hsSyn/HsBinds.lhs @@ -81,40 +81,44 @@ type LHsBindLR idL idR = Located (HsBindLR idL idR) type LHsBindsLR idL idR = Bag (LHsBindLR idL idR) data HsBindLR idL idR - = FunBind { -- FunBind is used for both functions f x = e - -- and variables f = \x -> e --- Reason 1: Special case for type inference: see TcBinds.tcMonoBinds --- --- Reason 2: instance decls can only have FunBinds, which is convenient --- If you change this, you'll need to change e.g. rnMethodBinds - --- But note that the form f :: a->a = ... --- parses as a pattern binding, just like --- (f :: a -> a) = ... + = -- | FunBind is used for both functions @f x = e@ + -- and variables @f = \x -> e@ + -- + -- Reason 1: Special case for type inference: see 'TcBinds.tcMonoBinds'. + -- + -- Reason 2: Instance decls can only have FunBinds, which is convenient. + -- If you change this, you'll need to change e.g. rnMethodBinds + -- + -- But note that the form @f :: a->a = ...@ + -- parses as a pattern binding, just like + -- @(f :: a -> a) = ... @ + FunBind { fun_id :: Located idL, - fun_infix :: Bool, -- True => infix declaration + fun_infix :: Bool, -- ^ True => infix declaration - fun_matches :: MatchGroup idR, -- The payload + fun_matches :: MatchGroup idR, -- ^ The payload - fun_co_fn :: HsWrapper, -- Coercion from the type of the MatchGroup to the type of + fun_co_fn :: HsWrapper, -- ^ Coercion from the type of the MatchGroup to the type of -- the Id. Example: + -- @ -- f :: Int -> forall a. a -> a -- f x y = y + -- @ -- Then the MatchGroup will have type (Int -> a' -> a') -- (with a free type variable a'). The coercion will take -- a CoreExpr of this type and convert it to a CoreExpr of -- type Int -> forall a'. a' -> a' -- Notice that the coercion captures the free a'. - bind_fvs :: NameSet, -- After the renamer, this contains a superset of the + bind_fvs :: NameSet, -- ^ After the renamer, this contains a superset of the -- Names of the other binders in this binding group that -- are free in the RHS of the defn -- Before renaming, and after typechecking, -- the field is unused; it's just an error thunk - fun_tick :: Maybe (Int,[idR]) -- This is the (optional) module-local tick number. + fun_tick :: Maybe (Int,[idR]) -- ^ This is the (optional) module-local tick number. } | PatBind { -- The pattern is never a simple variable;