diff options
Diffstat (limited to 'src/Inky/Term')
| -rw-r--r-- | src/Inky/Term/Parser.idr | 369 | ||||
| -rw-r--r-- | src/Inky/Term/Pretty.idr | 32 |
2 files changed, 357 insertions, 44 deletions
diff --git a/src/Inky/Term/Parser.idr b/src/Inky/Term/Parser.idr index 7a67441..6913bf8 100644 --- a/src/Inky/Term/Parser.idr +++ b/src/Inky/Term/Parser.idr @@ -1,5 +1,7 @@ module Inky.Term.Parser +import public Data.Fun + import Data.List1 import Data.String import Inky.Context @@ -21,6 +23,7 @@ data InkyKind | In | Case | Of + | FoldCase | Fold | By | Nat @@ -36,8 +39,10 @@ data InkyKind | DoubleArrow | Bang | Tilde + | Dot | Backslash | Colon + | Semicolon | Equal | Comma | Ignore @@ -52,6 +57,7 @@ export In == In = True Case == Case = True Of == Of = True + FoldCase == FoldCase = True Fold == Fold = True By == By = True Nat == Nat = True @@ -67,8 +73,10 @@ export DoubleArrow == DoubleArrow = True Bang == Bang = True Tilde == Tilde = True + Dot == Dot = True Backslash == Backslash = True Colon == Colon = True + Semicolon == Semicolon = True Equal == Equal = True Comma == Comma = True Ignore == Ignore = True @@ -84,6 +92,7 @@ Interpolation InkyKind where interpolate In = "'in'" interpolate Case = "'case'" interpolate Of = "'of'" + interpolate FoldCase = "'foldcase'" interpolate Fold = "'fold'" interpolate By = "'by'" interpolate Nat = "'Nat'" @@ -99,8 +108,10 @@ Interpolation InkyKind where interpolate DoubleArrow = "'=>'" interpolate Bang = "'!'" interpolate Tilde = "'~'" + interpolate Dot = "'.'" interpolate Backslash = "'\\'" interpolate Colon = "':'" + interpolate Semicolon = "';'" interpolate Equal = "'='" interpolate Comma = "','" interpolate Ignore = "" @@ -119,6 +130,7 @@ TokenKind InkyKind where tokValue In = const () tokValue Case = const () tokValue Of = const () + tokValue FoldCase = const () tokValue Fold = const () tokValue By = const () tokValue Nat = const () @@ -134,8 +146,10 @@ TokenKind InkyKind where tokValue DoubleArrow = const () tokValue Bang = const () tokValue Tilde = const () + tokValue Dot = const () tokValue Backslash = const () tokValue Colon = const () + tokValue Semicolon = const () tokValue Equal = const () tokValue Comma = const () tokValue Ignore = const () @@ -147,6 +161,7 @@ keywords = , ("in", In) , ("case", Case) , ("of", Of) + , ("foldcase", FoldCase) , ("fold", Fold) , ("by", By) , ("Nat", Nat) @@ -169,7 +184,10 @@ typeIdentifier = upper <+> many (alphaNum <|> exact "_") export tokenMap : TokenMap InkyToken tokenMap = - toTokenMap [(spaces, Ignore)] ++ + toTokenMap + [ (spaces, Ignore) + , (lineComment $ exact "--", Ignore) + ] ++ [(termIdentifier, \s => case lookup s keywords of Just k => Tok k s @@ -192,8 +210,10 @@ tokenMap = , (exact "=>", DoubleArrow) , (exact "!", Bang) , (exact "~", Tilde) + , (exact ".", Dot) , (exact "\\", Backslash) , (exact ":", Colon) + , (exact ";", Semicolon) , (exact "=", Equal) , (exact ",", Comma) ] @@ -201,6 +221,16 @@ tokenMap = -- Parser ---------------------------------------------------------------------- public export +DFun : (ts : Vect n Type) -> Fun ts Type -> Type +DFun [] r = r +DFun (t :: ts) r = (x : t) -> DFun ts (r x) + +public export +DIFun : (ts : Vect n Type) -> Fun ts Type -> Type +DIFun [] r = r +DIFun (t :: ts) r = {x : t} -> DIFun ts (r x) + +public export InkyParser : Bool -> Context Type -> Context Type -> (a : Type) -> Type InkyParser nil locked free a = Parser InkyKind nil @@ -209,33 +239,74 @@ InkyParser nil locked free a = a public export -record TypeFun where - constructor MkTypeFun - try : (ctx : Context ()) -> Either String (Ty ctx ()) +record ParseFun (0 tys: Vect n Type) (0 p : Fun (map Context tys) Type) where + constructor MkParseFun + try : DFun (map Context tys) (chain {ts = map Context tys} (Either String) p) + +mkVar : ({ctx : Context ()} -> Var ctx () -> p ctx) -> WithBounds String -> ParseFun [()] p +mkVar f x = + MkParseFun + (\ctx => case lookup x.val ctx of + Just (() ** i) => pure (f i) + Nothing => Left "\{x.bounds}: unbound name \"\{x.val}\"") + +mkVar2 : + ({tyCtx, tmCtx : Context ()} -> Var tmCtx () -> p tyCtx tmCtx) -> + WithBounds String -> ParseFun [(), ()] p +mkVar2 f x = + MkParseFun + (\tyCtx, tmCtx => case lookup x.val tmCtx of + Just (() ** i) => pure (f i) + Nothing => Left "\{x.bounds}: unbound name \"\{x.val}\"") + +public export +TypeFun : Type +TypeFun = ParseFun [()] (\ctx => Ty ctx ()) + +public export +SynthFun : Type +SynthFun = ParseFun [(), ()] SynthTerm + +public export +CheckFun : Type +CheckFun = ParseFun [(), ()] CheckTerm public export TypeParser : Context () -> Context () -> Type TypeParser locked free = InkyParser False (map (const TypeFun) locked) (map (const TypeFun) free) TypeFun -Row : InkyParser True [<] [<"openType" :- TypeFun] (List $ Assoc TypeFun) -Row = - sepBy (match Comma) - (mkAssoc <$> Seq [match TypeIdent, match Colon, Var (%% "openType")]) +RowOf : (0 free : Context Type) -> InkyParser False [<] free a -> InkyParser True [<] free (List $ WithBounds $ Assoc a) +RowOf free p = sepBy (match Comma) (WithBounds $ mkAssoc <$> Seq [match TypeIdent, match Colon, p]) where - mkAssoc : HList [String, (), TypeFun] -> Assoc TypeFun + mkAssoc : HList [String, (), a] -> Assoc a mkAssoc [x, _, v] = x :- v -tryRow : WithBounds (List $ Assoc TypeFun) -> (ctx : Context ()) -> Either String (Row (Ty ctx ())) +tryRow : + List (WithBounds $ Assoc (ParseFun [()] p)) -> + (ctx : Context ()) -> Either String (Row $ p ctx) tryRow xs ctx = foldlM (\row, xf => do - a <- xf.value.try ctx - let Just row' = extend row (xf.name :- a) - | Nothing => Left "\{xs.bounds}: duplicate name \"\{xf.name}\"" + a <- xf.val.value.try ctx + let Just row' = extend row (xf.val.name :- a) + | Nothing => Left "\{xf.bounds}: duplicate name \"\{xf.val.name}\"" + pure row') + [<] + xs + +tryRow2 : + List (WithBounds $ Assoc (ParseFun [(), ()] p)) -> + (tyCtx, tmCtx : Context ()) -> Either String (Row $ p tyCtx tmCtx) +tryRow2 xs tyCtx tmCtx = + foldlM + (\row, xf => do + a <- xf.val.value.try tyCtx tmCtx + let Just row' = extend row (xf.val.name :- a) + | Nothing => Left "\{xf.bounds}: duplicate name \"\{xf.val.name}\"" pure row') [<] - xs.val + xs OpenOrFixpointType : TypeParser [<] [<"openType" :- ()] OpenOrFixpointType = @@ -246,31 +317,26 @@ OpenOrFixpointType = ] where mkFix : HList [(), String, (), TypeFun] -> TypeFun - mkFix [_, x, _, a] = MkTypeFun (\ctx => pure $ TFix x !(a.try (ctx :< (x :- ())))) + mkFix [_, x, _, a] = MkParseFun (\ctx => pure $ TFix x !(a.try (ctx :< (x :- ())))) AtomType : TypeParser [<"openType" :- ()] [<] AtomType = OneOf - [ - mkVar <$> WithBounds (match TypeIdent) - , MkTypeFun (\_ => pure TNat) <$ match Nat - , mkProd <$> enclose (match AngleOpen) (match AngleClose) (WithBounds Row) - , mkSum <$> enclose (match BracketOpen) (match BracketClose) (WithBounds Row) + [ mkVar TVar <$> WithBounds (match TypeIdent) + , MkParseFun (\_ => pure TNat) <$ match Nat + , mkProd <$> enclose (match AngleOpen) (match AngleClose) Row + , mkSum <$> enclose (match BracketOpen) (match BracketClose) Row , enclose (match ParenOpen) (match ParenClose) OpenOrFixpointType ] where - mkVar : WithBounds String -> TypeFun - mkVar x = - MkTypeFun - (\ctx => case lookup x.val ctx of - Just (() ** i) => pure (TVar i) - Nothing => Left "\{x.bounds}: unbound name \"\{x.val}\"") + Row : InkyParser True [<] [<"openType" :- TypeFun] (List $ WithBounds $ Assoc TypeFun) + Row = RowOf [<"openType" :- TypeFun] $ Var (%% "openType") - mkProd : WithBounds (List $ Assoc TypeFun) -> TypeFun - mkProd xs = MkTypeFun (\ctx => TProd <$> tryRow xs ctx) + mkProd : List (WithBounds $ Assoc TypeFun) -> TypeFun + mkProd xs = MkParseFun (\ctx => TProd <$> tryRow xs ctx) - mkSum : WithBounds (List $ Assoc TypeFun) -> TypeFun - mkSum xs = MkTypeFun (\ctx => TSum <$> tryRow xs ctx) + mkSum : List (WithBounds $ Assoc TypeFun) -> TypeFun + mkSum xs = MkParseFun (\ctx => TSum <$> tryRow xs ctx) export OpenType : TypeParser [<] [<] @@ -278,9 +344,250 @@ OpenType = Fix "openType" $ mkArrow <$> sepBy1 (match Arrow) AtomType where mkArrow : List1 TypeFun -> TypeFun - mkArrow = foldr1 (\x, y => MkTypeFun (\ctx => [| TArrow (x.try ctx) (y.try ctx) |])) + mkArrow = foldr1 (\x, y => MkParseFun (\ctx => [| TArrow (x.try ctx) (y.try ctx) |])) %hint export OpenTypeWf : So (wellTyped EqI [<] [<] [<] [<] OpenType) OpenTypeWf = Oh + +-- Terms ----------------------------------------------------------------------- + +embed : SynthFun -> CheckFun +embed x = MkParseFun (\tyCtx, tmCtx => Embed <$> x.try tyCtx tmCtx) + +unembed : WithBounds CheckFun -> SynthFun +unembed x = + MkParseFun (\tyCtx, tmCtx => do + t <- x.val.try tyCtx tmCtx + case t of + Embed e => pure e + _ => Left "\{x.bounds}: cannot synthesise type") + +AtomCheck : InkyParser False [<"openCheck" :- CheckFun] [<] CheckFun +AtomCheck = + OneOf + [ embed <$> mkVar2 Var <$> WithBounds (match TermIdent) + , embed <$> mkLit <$> match Lit + , embed <$> MkParseFun (\_, _ => pure Suc) <$ match Suc + , mkTup <$> (enclose (match AngleOpen) (match AngleClose) $ + RowOf [<"openCheck" :- CheckFun] (Var (%% "openCheck"))) + , enclose (match ParenOpen) (match ParenClose) (Var (%% "openCheck")) + ] + where + mkLit : Nat -> SynthFun + mkLit k = MkParseFun (\_, _ => pure (Lit k)) + + mkTup : List (WithBounds $ Assoc CheckFun) -> CheckFun + mkTup xs = MkParseFun (\tyCtx, tmCtx => Tup <$> tryRow2 xs tyCtx tmCtx) + +PrefixCheck : InkyParser False [<"openCheck" :- CheckFun] [<] CheckFun +PrefixCheck = + Fix "prefixCheck" $ OneOf + [ embed <$> mkExpand <$> unembed <$> (match Bang **> WithBounds (Var $ %% "prefixCheck")) + , mkContract <$> (match Tilde **> Var (%% "prefixCheck")) + , rename (Drop Id) Id AtomCheck + ] + where + mkExpand : SynthFun -> SynthFun + mkExpand x = MkParseFun (\tyCtx, tmCtx => [| Expand (x.try tyCtx tmCtx) |]) + + mkContract : CheckFun -> CheckFun + mkContract x = MkParseFun (\tyCtx, tmCtx => [| Contract (x.try tyCtx tmCtx) |]) + +SuffixCheck : InkyParser False [<"openCheck" :- CheckFun] [<] CheckFun +SuffixCheck = mkSuffix <$> Seq [ WithBounds PrefixCheck , star (match Dot **> match TypeIdent) ] + where + mkSuffix : HList [WithBounds CheckFun, List String] -> CheckFun + mkSuffix [t, []] = t.val + mkSuffix [t, prjs] = + embed $ + MkParseFun (\tyCtx, tmCtx => pure $ foldl Prj !((unembed t).try tyCtx tmCtx) prjs) + +AppCheck : InkyParser False [<"openCheck" :- CheckFun] [<] CheckFun +AppCheck = + OneOf + [ mkInj <$> Seq + [ match TypeIdent + , weaken (S Z) SuffixCheck + ] + , mkApp <$> Seq [ WithBounds SuffixCheck , star (weaken (S Z) SuffixCheck) ] + ] + where + mkInj : HList [String, CheckFun] -> CheckFun + mkInj [tag, t] = MkParseFun (\tyCtx, tmCtx => Inj tag <$> t.try tyCtx tmCtx) + + mkApp : HList [WithBounds CheckFun, List CheckFun] -> CheckFun + mkApp [t, []] = t.val + mkApp [fun, (arg :: args)] = + MkParseFun (\tyCtx, tmCtx => + pure $ Embed $ + App + !((unembed fun).try tyCtx tmCtx) + ( !(arg.try tyCtx tmCtx) + :: (!(foldlM (\acc, arg => pure $ acc :< !(arg.try tyCtx tmCtx)) [<] args) <>> []))) + +AnnotCheck : InkyParser False [<"openCheck" :- CheckFun] [<] CheckFun +AnnotCheck = + mkAnnot <$> Seq + [ AppCheck + , option (match Colon **> rename Id (Drop Id) OpenType) + ] + where + mkAnnot : HList [CheckFun, Maybe TypeFun] -> CheckFun + mkAnnot [t, Nothing] = t + mkAnnot [t, Just a] = embed $ MkParseFun (\tyCtx, tmCtx => [| Annot (t.try tyCtx tmCtx) (a.try tyCtx) |]) + +-- Open Terms + +LetCheck : InkyParser False [<"openCheck" :- CheckFun] [<] CheckFun +LetCheck = + match Let **> + OneOf + [ mkLet <$> Seq + [ match TermIdent + , OneOf + [ mkBound <$> Seq + [ star (enclose (match ParenOpen) (match ParenClose) $ + Seq [ match TermIdent, match Colon, rename Id (Drop Id) OpenType ]) + , match Colon + , rename Id (Drop Id) OpenType + , match Equal + , Var (%% "openCheck")] + , match Equal **> unembed <$> WithBounds (Var (%% "openCheck")) + ] + , match In + , Var (%% "openCheck") + ] + , mkLetType <$> Seq + [ match TypeIdent + , match Equal + , rename Id (Drop Id) OpenType + , match In + , Var (%% "openCheck") + ] + ] + where + mkLet : HList [String, SynthFun, (), CheckFun] -> CheckFun + mkLet [x, e, _, t] = MkParseFun (\tyCtx, tmCtx => pure $ Let x !(e.try tyCtx tmCtx) !(t.try tyCtx (tmCtx :< (x :- ())))) + + mkLetType : HList [String, (), TypeFun, (), CheckFun] -> CheckFun + mkLetType [x, _, a, _, t] = + MkParseFun (\tyCtx, tmCtx => pure $ LetTy x !(a.try tyCtx) !(t.try (tyCtx :< (x :- ())) tmCtx)) + + mkArrow : List TypeFun -> TypeFun -> TypeFun + mkArrow [] cod = cod + mkArrow (arg :: args) cod = + MkParseFun (\ctx => [| TArrow (arg.try ctx) ((mkArrow args cod).try ctx) |]) + + mkBound : HList [List (HList [String, (), TypeFun]), (), TypeFun, (), CheckFun] -> SynthFun + mkBound [[], _, cod, _, t] = + MkParseFun (\tyCtx, tmCtx => + pure $ + Annot !(t.try tyCtx tmCtx) !(cod.try tyCtx)) + mkBound [args, _, cod, _, t] = + let dom = foldl (\dom, [x, _, a] => dom :< (x :- ())) [<] args in + MkParseFun (\tyCtx, tmCtx => + pure $ + Annot (Abs dom !(t.try tyCtx (tmCtx ++ dom))) !((mkArrow (map (\[x, _, a] => a) args) cod).try tyCtx)) + +AbsCheck : InkyParser False [<"openCheck" :- CheckFun] [<] CheckFun +AbsCheck = + mkAbs <$> Seq + [ match Backslash + , sepBy1 (match Comma) (match TermIdent) + , match DoubleArrow + , Var (%% "openCheck") + ] + where + mkAbs : HList [(), List1 String, (), CheckFun] -> CheckFun + mkAbs [_, args, _, body] = + let args = foldl (\args, x => args :< (x :- ())) [<] args in + MkParseFun (\tyCtx, tmCtx => Abs args <$> body.try tyCtx (tmCtx ++ args)) + +CaseCheck : InkyParser False [<"openCheck" :- CheckFun] [<] CheckFun +CaseCheck = + (\[f, x] => f x) <$> + Seq + [ OneOf + [ mkCase <$> Seq + [ match Case + , unembed <$> WithBounds (Var $ %% "openCheck") + , match Of + ] + , mkFoldCase <$> Seq + [ match FoldCase + , unembed <$> WithBounds (Var $ %% "openCheck") + , match By + ] + ] + , enclose (match BraceOpen) (match BraceClose) ( + sepBy (match Semicolon) $ + WithBounds $ + Seq + [ match TypeIdent + , match TermIdent + , match DoubleArrow + , Var (%% "openCheck") + ]) + ] + where + Cases : Type + Cases = List (WithBounds $ HList [String, String, (), CheckFun]) + + mkBranch : + HList [String, String, (), CheckFun] -> + Assoc (ParseFun [(), ()] $ \tyCtx, tmCtx => (x ** CheckTerm tyCtx (tmCtx :< (x :- ())))) + mkBranch [tag, bound, _, branch] = + tag :- MkParseFun (\tyCtx, tmCtx => pure (bound ** !(branch.try tyCtx (tmCtx :< (bound :- ()))))) + + mkCase : HList [_, SynthFun, _] -> Cases -> CheckFun + mkCase [_, target, _] branches = + let branches = map (map mkBranch) branches in + MkParseFun (\tyCtx, tmCtx => + [| Case (target.try tyCtx tmCtx) (tryRow2 branches tyCtx tmCtx) |]) + + mkFoldCase : HList [_, SynthFun, _] -> Cases -> CheckFun + mkFoldCase [_, target, _] branches = + let branches = map (map mkBranch) branches in + MkParseFun (\tyCtx, tmCtx => + pure $ + Fold + !(target.try tyCtx tmCtx) + "__tmp" + (Case (Var $ %% "__tmp") !(tryRow2 branches tyCtx (tmCtx :< ("__tmp" :- ()))))) + +FoldCheck : InkyParser False [<"openCheck" :- CheckFun] [<] CheckFun +FoldCheck = + mkFold <$> Seq + [ match Fold + , unembed <$> WithBounds (Var (%% "openCheck")) + , match By + , enclose (match ParenOpen) (match ParenClose) $ + Seq + [ match Backslash + , match TermIdent + , match DoubleArrow + , Var (%% "openCheck") + ] + ] + where + mkFold : HList [(), SynthFun, (), HList [(), String, (), CheckFun]] -> CheckFun + mkFold [_, target, _, [_, arg, _, body]] = + MkParseFun (\tyCtx, tmCtx => pure $ Fold !(target.try tyCtx tmCtx) arg !(body.try tyCtx (tmCtx :< (arg :- ())))) + +export +OpenCheck : InkyParser False [<] [<] CheckFun +OpenCheck = + Fix "openCheck" $ OneOf + [ LetCheck + , AbsCheck + , CaseCheck + , FoldCheck + , AnnotCheck + ] + +%hint +export +OpenCheckWf : So (wellTyped EqI [<] [<] [<] [<] OpenCheck) +OpenCheckWf = ?d -- Oh diff --git a/src/Inky/Term/Pretty.idr b/src/Inky/Term/Pretty.idr index 7c5ee4d..3bed88b 100644 --- a/src/Inky/Term/Pretty.idr +++ b/src/Inky/Term/Pretty.idr @@ -23,6 +23,7 @@ export prettySynth : {tyCtx, tmCtx : Context ()} -> SynthTerm tyCtx tmCtx -> Prec -> Doc ann +export prettyCheck : {tyCtx, tmCtx : Context ()} -> CheckTerm tyCtx tmCtx -> Prec -> Doc ann @@ -38,15 +39,13 @@ prettyCheckCtxBinding : prettySynth (Var i) d = pretty (unVal $ nameOf i) prettySynth (Lit k) d = pretty k -prettySynth (Suc t) d = - parenthesise (d >= appPrec) $ group $ align $ hang 2 $ - "suc" <+> line <+> prettyCheck t appPrec +prettySynth Suc d = pretty "suc" prettySynth (App e ts) d = parenthesise (d >= appPrec) $ group $ align $ hang 2 $ concatWith (surround line) (prettySynth e appPrec :: prettyAllCheck ts appPrec) prettySynth (Prj e x) d = parenthesise (d > prjPrec) $ group $ align $ hang 2 $ - prettySynth e prjPrec <+> "." <+> pretty x + prettySynth e prjPrec <+> line' <+> "." <+> pretty x prettySynth (Expand e) d = "!" <+> (parenthesise (d > expandPrec) $ group $ align $ hang 2 $ @@ -55,17 +54,25 @@ prettySynth (Annot t a) d = parenthesise (d > annotPrec) $ group $ align $ hang 2 $ prettyCheck t annotPrec <++> ":" <+> line <+> prettyType a annotPrec +prettyCheck (LetTy x a t) d = + parenthesise (d > letPrec) $ group $ align $ + "let" <++> + (group $ align $ hang 2 $ + pretty x <++> "=" <+> line <+> prettyType a letPrec + ) <+> line <+> + "in" <+> line <+> + prettyCheck t letPrec prettyCheck (Let x e t) d = - parenthesise (d > letPrec) $ group $ align $ hang 2 $ + parenthesise (d > letPrec) $ group $ align $ "let" <++> (group $ align $ hang 2 $ pretty x <++> "=" <+> line <+> prettySynth e letPrec - ) <++> + ) <+> line <+> "in" <+> line <+> prettyCheck t letPrec prettyCheck (Abs bound t) d = parenthesise (d > absPrec) $ group $ align $ hang 2 $ - "\\" <+> concatWith (surround ",") (bindings bound <>> []) <++> "=>" <+> line <+> + "\\" <+> concatWith (surround $ "," <+> line) (bindings bound <>> []) <++> "=>" <+> line <+> prettyCheck t absPrec where bindings : Context () -> SnocList (Doc ann) @@ -73,16 +80,15 @@ prettyCheck (Abs bound t) d = bindings (bound :< (x :- ())) = bindings bound :< pretty x prettyCheck (Inj k t) d = parenthesise (d > injPrec) $ group $ align $ hang 2 $ - "<" <+> line' <+> pretty k <+> line' <+> ">" <+> prettyCheck t injPrec + pretty k <+> line <+> prettyCheck t injPrec prettyCheck (Tup ts) d = - parens $ group $ align $ hang 2 $ + enclose "<" ">" $ group $ align $ hang 2 $ concatWith (surround $ "," <+> line) (prettyCheckCtx ts tupPrec) prettyCheck (Case e ts) d = parenthesise (d > casePrec) $ group $ align $ hang 2 $ "case" <++> prettySynth e casePrec <++> "of" <+> line <+> - (braces $ align $ hang 2 $ - concatWith (surround hardline) $ - map parens $ + (braces $ group $ align $ hang 2 $ + concatWith (surround $ ";" <+> line) $ prettyCheckCtxBinding ts casePrec) prettyCheck (Contract t) d = "~" <+> @@ -106,5 +112,5 @@ prettyCheckCtx (ts :< (x :- t)) d = prettyCheckCtxBinding [<] d = [] prettyCheckCtxBinding (ts :< (x :- (y ** t))) d = (group $ align $ hang 2 $ - "\\" <+> pretty x <++> pretty y <++> "=>" <+> line <+> prettyCheck t d) :: + pretty x <++> pretty y <++> "=>" <+> line <+> prettyCheck t d) :: prettyCheckCtxBinding ts d |