diff options
Diffstat (limited to 'compiler/Language')
| -rw-r--r-- | compiler/Language/Haskell/Syntax/Binds.hs | 47 |
1 files changed, 2 insertions, 45 deletions
diff --git a/compiler/Language/Haskell/Syntax/Binds.hs b/compiler/Language/Haskell/Syntax/Binds.hs index 8917e77733..183fce9836 100644 --- a/compiler/Language/Haskell/Syntax/Binds.hs +++ b/compiler/Language/Haskell/Syntax/Binds.hs @@ -206,23 +206,6 @@ data HsBindLR idL idR fun_ext :: XFunBind idL idR, - -- ^ After the renamer (but before the type-checker), this contains the - -- locally-bound free variables of this defn. See Note [Bind free vars] - -- - -- After the type-checker, this contains a 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'. - fun_id :: LIdP idL, -- Note [fun_id in Match] in GHC.Hs.Expr fun_matches :: MatchGroup idR (LHsExpr idR), -- ^ The payload @@ -244,7 +227,7 @@ data HsBindLR idL idR -- For details on above see Note [exact print annotations] in GHC.Parser.Annotation | PatBind { - pat_ext :: XPatBind idL idR, -- ^ See Note [Bind free vars] + pat_ext :: XPatBind idL idR, pat_lhs :: LPat idL, pat_rhs :: GRHSs idR (LHsExpr idR), pat_ticks :: ([CoreTickish], [[CoreTickish]]) @@ -331,8 +314,7 @@ data ABExport p -- | Pattern Synonym binding data PatSynBind idL idR - = PSB { psb_ext :: XPSB idL idR, -- ^ Post renaming, FVs. - -- See Note [Bind free vars] + = PSB { psb_ext :: XPSB idL idR, psb_id :: LIdP idL, -- ^ Name of the pattern synonym psb_args :: HsPatSynDetails idR, -- ^ Formal parameter names psb_def :: LPat idR, -- ^ Right-hand side @@ -546,31 +528,6 @@ The abe_wrap field deals with impedance-matching between (/\a b. case tup a b of { (f,g) -> f }) and the thing we really want, which may have fewer type variables. The action happens in GHC.Tc.Gen.Bind.mkExport. - -Note [Bind free vars] -~~~~~~~~~~~~~~~~~~~~~ -The bind_fvs field of FunBind and PatBind records the free variables -of the definition. It is used for the following purposes - -a) Dependency analysis prior to type checking - (see GHC.Tc.Gen.Bind.tc_group) - -b) Deciding whether we can do generalisation of the binding - (see GHC.Tc.Gen.Bind.decideGeneralisationPlan) - -c) Deciding whether the binding can be used in static forms - (see GHC.Tc.Gen.Expr.checkClosedInStaticForm for the HsStatic case and - GHC.Tc.Gen.Bind.isClosedBndrGroup). - -Specifically, - - * bind_fvs includes all free vars that are defined in this module - (including top-level things and lexically scoped type variables) - - * bind_fvs excludes imported vars; this is just to keep the set smaller - - * Before renaming, and after typechecking, the field is unused; - it's just an error thunk -} |