Additional work

- Move processDecl to separate file
- Add missing files
- Move Syntax.idr to Lib

newt/ptest1.newt

@@ -0,0 +1,12 @@
+module Bug
+
+Nat : U
+Nat = (N : U) -> (N -> N) -> N -> N
+
+zero : Nat
+zero = \ U s z => z
+
+-- This fails unification if we allow U on the LHS, because U is special on the RHS.
+-- We need to not parse it on the LHS if we're not pattern matching.
+succ : Nat -> Nat
+succ = \ n U s z => s (n U s z)

newt/test1.newt

@@ -0,0 +1,8 @@
+module Scratch
+
+nat : U
+nat = {C : U} -> C -> (nat -> C) -> C
+
+-- TESTCASE This was broken when I wasn't expanding Ref ty in check
+succ : nat -> nat
+succ = \n => \ z s => s n

newt/zoo4.newt

@@ -0,0 +1,93 @@
+module Zoo4
+
+id : {A : U} -> A -> A
+id = \x => x   -- elaborated to \{A} x. x
+
+-- implicit arg types can be omitted
+const : {A B} -> A -> B -> A
+const = \x y => x
+
+-- function arguments can be grouped:
+group1 : {A B : U}(x y z : A) -> B -> B
+group1 = \x y z b => b
+
+group2 : {A B}(x y z : A) -> B -> B
+group2 = \x y z b=> b
+
+-- explicit id function used for annotation as in Idris
+the : (A : _) -> A -> A
+the = \_ x => x
+
+-- implicit args can be explicitly given
+-- NB kovacs left off the type (different syntax), so I put a hole in there
+argTest1 : _
+argTest1 = const {U} {U} U
+
+-- I've decided not to do = in the {} for now.
+-- let argTest2 = const {B = U} U;  -- only give B, the second implicit arg
+
+-- again no type, this hits a lambda in infer.
+-- I think we need to create two metas and make a pi of them.
+insert2 : _
+insert2 = (\{A} x => the A x) U -- (\{A} x => the A x) {U} U
+
+Bool : U
+Bool = (B : _) -> B -> B -> B
+
+true : Bool
+true = \B t f => t
+
+false : Bool
+false = \B t f => f
+
+List : U -> U
+List = \A => (L : _) -> (A -> L -> L) -> L -> L
+
+nil : {A} -> List A
+nil = \L cons nil => nil
+
+cons : {A} -> A -> List A -> List A
+cons = \ x xs L cons nil => cons x (xs L cons nil)
+
+map : {A B} -> (A -> B) -> List A -> List B
+map = \{A} {B} f xs L c n => xs L (\a => c (f a)) n
+
+list1 : List Bool
+list1 = cons true (cons false (cons true nil))
+
+-- dependent function composition
+comp : {A} {B : A -> U} {C : {a} -> B a -> U}
+       (f : {a} (b : B a) -> C b)
+       (g : (a : A) -> B a)
+       (a : A)
+       -> C (g a)
+comp = \f g a => f (g a)
+
+compExample : _
+compExample = comp (cons true) (cons false) nil
+
+Nat : U
+Nat = (N : U) -> (N -> N) -> N -> N
+
+-- TODO - first underscore there, why are there two metas?
+mul : Nat -> Nat -> Nat
+mul = \a b N s z => a _ (b _ s) z
+
+ten : Nat
+ten = \N s z => (s (s (s (s (s (s (s (s (s (s z))))))))))
+
+hundred : _
+hundred = mul ten ten
+
+-- Leibniz equality
+Eq : {A} -> A -> A -> U
+Eq = \{A} x y => (P : A -> U) -> P x -> P y
+
+refl : {A} {x : A} -> Eq x x
+refl = \_ px => px
+
+sym : {A x y} -> Eq {A} x y -> Eq y x
+sym = \p => p (\y => Eq y x) refl
+
+eqtest : Eq (mul ten ten) hundred
+eqtest = refl

src/Lib/Check.idr

@@ -1,6 +1,8 @@
 module Lib.Check
 
+import Control.Monad.Error.Either
 import Control.Monad.Error.Interface
+import Control.Monad.State
 import Control.Monad.Identity
 import Lib.Parser.Impl
 import Lib.Prettier
@@ -10,11 +12,11 @@ import Data.String
 import Lib.Types
 import Lib.TT
 import Lib.TopContext
-import Syntax
+import Lib.Syntax
 
 -- renaming
 -- dom gamma ren
-data PRen = PR Nat Nat (List Nat)
+data Pden = PR Nat Nat (List Nat)
 
 -- IORef for metas needs IO
 
@@ -24,6 +26,17 @@ forceMeta (VMeta ix sp) = case !(lookupMeta ix) of
   (Solved k t) => vappSpine t sp
 forceMeta x = pure x
 
+-- Lennart needed more forcing
+forceType : Val -> M Val
+forceType (VRef nm sp) =
+    case lookup nm !(get) of
+      (Just (MkEntry name type (Fn t))) => eval [] CBN t
+      _ => pure (VRef nm sp)
+forceType (VMeta ix sp) = case !(lookupMeta ix) of
+  (Unsolved x k xs) => pure (VMeta ix sp)
+  (Solved k t) => vappSpine t sp >>= forceType
+forceType x = pure x
+
 
 parameters (ctx: Context)
   -- return renaming, the position is the new VVar
@@ -87,9 +100,9 @@ parameters (ctx: Context)
   unifySpine l True _ _ = error [DS "meta spine length mismatch"]
 
   unify l t u = do
-    putStrLn "Unify \{show ctx.lvl}"
-    putStrLn "  \{show l} \{show t}"
-    putStrLn "  =?= \{show u}"
+    debug "Unify \{show ctx.lvl}"
+    debug "  \{show l} \{show t}"
+    debug "  =?= \{show u}"
     t' <- forceMeta t
     u' <- forceMeta u
     case (t',u') of
@@ -102,6 +115,7 @@ parameters (ctx: Context)
         else error [DS "vvar mismatch \{show k} \{show k'}"]
       (VRef k sp,   VRef k' sp'  ) =>
         if k == k' then unifySpine l (k == k') sp sp'
+        -- REVIEW - consider forcing?
         else error [DS "vref mismatch \{show k} \{show k'}"]
       (VMeta k sp,  VMeta k' sp' ) =>
         if k == k' then unifySpine l (k == k') sp sp'
@@ -109,8 +123,23 @@ parameters (ctx: Context)
       (t,           VMeta i' sp') => solve l i' sp' t
       (VMeta i sp, t'           ) => solve l i sp t'
       (VU, VU) => pure ()
-      -- REVIEW consider quoting back
-      _ => error [DS "unify failed \{show t'} =?= \{show u'} \n  env is \{show ctx.env}" ]
+      -- Lennart.newt cursed type references itself
+      -- We _could_ look up the ref, eval against [] and vappSpine...
+      (t,         VRef k' sp') => do
+        debug "expand \{show t} =?= %ref \{k'}"
+        case lookup k' !(get) of
+          Just (MkEntry name ty (Fn tm)) => unify l t !(vappSpine !(eval [] CBN tm) sp')
+          _ => error [DS "unify failed \{show t'} =?= \{show u'} [no Fn]\n  env is \{show ctx.env} \{show $ map fst ctx.types}" ]
+      -- REVIEW I'd like to quote this back, but we have l that aren't in the environment.
+      _ => error [DS "unify failed \{show t'} =?= \{show u'} \n  env is \{show ctx.env} \{show $ map fst ctx.types}" ]
+
+unifyCatch : Context -> Val -> Val -> M ()
+unifyCatch ctx ty' ty = catchError (unify ctx ctx.lvl ty' ty) $ \(E x str) => do
+    let names = toList $ map fst ctx.types
+    a <- quote ctx.lvl ty'
+    b <- quote ctx.lvl ty
+    let msg = "\n  failed to unify \{pprint names a}\n    with \{pprint names b}\n  " <+> str
+    throwError (E x msg)
 
 insert : (ctx : Context) -> Tm -> Val -> M (Tm, Val)
 insert ctx tm ty = do
@@ -121,51 +150,81 @@ insert ctx tm ty = do
       insert ctx (App tm m) !(b $$ mv)
     va => pure (tm, va)
 
+lookupName : Context -> Raw -> M (Maybe (Tm, Val))
+lookupName ctx (RVar nm) = go 0 ctx.types
+  where
+    go : Nat -> Vect n (String, Val)  -> M  (Maybe (Tm, Val))
+    go i [] = case lookup nm !(get) of
+      Just (MkEntry name ty (Fn t)) => pure $ Just (Ref nm (Just t), !(eval [] CBN ty))
+      Just (MkEntry name ty _) => pure $ Just (Ref nm Nothing, !(eval [] CBN ty))
+      Nothing => pure Nothing
+    go i ((x, ty) :: xs) = if x == nm then pure $ Just (Bnd i, ty)
+      else go (i + 1) xs
+lookupName ctx _ = pure Nothing
+
+
 export
 infer : Context -> Raw  -> M  (Tm, Val)
 
 export
 check : Context -> Raw -> Val  -> M  Tm
-check ctx tm ty with (force ty)
-  check ctx (RSrcPos x tm) _ | ty = check ({pos := x} ctx) tm ty
-  check ctx t@(RLam nm icit tm) _ | ty = case ty of
-          (VPi nm' icit' a b) => do
-            putStrLn "icits \{nm} \{show icit} \{nm'} \{show icit'}"
-            if icit == icit' then do
-                let var = VVar (length ctx.env) [<]
-                let ctx' = extend ctx nm a
-                tm' <- check ctx' tm !(b $$ var)
-                pure $ Lam nm tm'
-              else if icit' == Implicit then do
-                let var = VVar (length ctx.env) [<]
-                ty' <- b $$ var
-                -- use nm' here if we want them automatically in scope
-                sc <- check (extend ctx nm' a) t ty'
-                pure $ Lam nm' sc
-              else
-                error [(DS "Icity issue checking \{show t} at \{show ty}")]
-          other => error [(DS "Expected pi type, got \{!(prval ty)}")]
-  check ctx tm _ | (VPi nm' Implicit a b) = do
-    putStrLn "XXX edge \{show tm} against VPi"
+check ctx tm ty = case (tm, !(forceType ty)) of
+  (RSrcPos x tm, ty) => check ({pos := x} ctx) tm ty
+  -- Document a hole, pretend it's implemented
+  (RHole, ty) => do
+    ty' <- quote ctx.lvl ty
+    let names = (toList $ map fst ctx.types)
+    env <- for ctx.types $ \(n,ty) => pure "  \{n} : \{pprint names !(quote ctx.lvl ty)}"
+    let msg = unlines (toList $ reverse env) ++ "  -----------\n" ++ "  goal \{pprint names ty'}"
+    debug "INFO at \{show ctx.pos}: "
+    debug msg
+    -- let context = unlines foo
+    -- need to print 'warning' with position
+    -- fixme - just put a name on it like idris and stuff it into top.
+    -- error [DS "hole:\n\{msg}"]
+    pure $ Ref "?" Nothing
+  (t@(RLam nm icit tm), ty@(VPi nm' icit' a b)) => do
+          debug "icits \{nm} \{show icit} \{nm'} \{show icit'}"
+          if icit == icit' then do
+              let var = VVar (length ctx.env) [<]
+              let ctx' = extend ctx nm a
+              tm' <- check ctx' tm !(b $$ var)
+              pure $ Lam nm tm'
+            else if icit' == Implicit then do
+              let var = VVar (length ctx.env) [<]
+              ty' <- b $$ var
+              -- use nm' here if we want them automatically in scope
+              sc <- check (extend ctx nm' a) t ty'
+              pure $ Lam nm' sc
+            else
+              error [(DS "Icity issue checking \{show t} at \{show ty}")]
+  (t@(RLam nm icit tm), ty) =>
+            error [(DS "Expected pi type, got \{!(prvalCtx ty)}")]
+
+  (tm, ty@(VPi nm' Implicit a b)) => do
+    let names = toList $ map fst ctx.types
+    debug "XXX edge add implicit lambda to \{show tm}"
     let var = VVar (length ctx.env) [<]
     ty' <- b $$ var
+    debug "XXX ty' is \{!(prvalCtx {ctx=(extend ctx nm' a)} ty')}"
     sc <- check (extend ctx nm' a) tm ty'
     pure $ Lam nm' sc
-  -- TODO Work in progress
-  -- I'd like to continue and also this is useless without some var names
-  check ctx RHole _ | ty = do
-    error [DS "hole has type \{show ty}"]
-  check ctx tm _ | ty = do
-    -- We need to insert if it's not a Lam
-    -- TODO figure out why the exception is here (cribbed from kovacs)
-    (tm', ty') <- case !(infer ctx tm) of
-      (tm'@(Lam{}),ty') => pure (tm', ty')
-      (tm', ty') => insert ctx tm' ty'
-    putStrLn "infer \{show tm} to \{pprint [] tm'} : \{show ty'} expect \{show ty}"
-    when( ctx.lvl /= length ctx.env) $ error [DS "level mismatch \{show ctx.lvl} \{show ctx.env}"]
-    unify ctx ctx.lvl ty' ty
-    pure tm'
 
+  (tm,ty) => do
+    -- We need to insert if tm is not an Implicit Lam
+    -- assuming all of the implicit ty have been handled above
+    let names = toList $ map fst ctx.types
+    (tm', ty') <- case !(infer ctx tm) of
+      -- Kovacs doesn't insert on tm = Implicit Lam, we don't have Plicity there
+      -- so I'll check the inferred type for an implicit pi
+      (tm'@(Lam{}), ty'@(VPi _ Implicit _ _)) => do debug "Lambda"; pure (tm', ty')
+      (tm', ty') => do
+        debug "RUN INSERT ON \{pprint names tm'} at \{show ty'}"
+        insert ctx tm' ty'
+
+    debug "INFER \{show tm} to (\{pprint names tm'} : \{show ty'}) expect \{show ty}"
+    unifyCatch ctx ty' ty
+    pure tm'
 
 infer ctx (RVar nm) = go 0 ctx.types
   where
@@ -194,7 +253,7 @@ infer ctx (RApp t u icit) = do
     -- If it's not a VPi, try to unify it with a VPi
     -- TODO test case to cover this.
     tty => do
-      putStrLn "unify PI for \{show tty}"
+      debug "unify PI for \{show tty}"
       a <- eval ctx.env CBN !(freshMeta ctx)
       b <- MkClosure ctx.env <$> freshMeta (extend ctx ":ins" a)
       unify ctx 0 tty (VPi ":ins" icit a b)
@@ -222,7 +281,7 @@ infer ctx (RLam nm icit tm) = do
   a <- freshMeta ctx >>= eval ctx.env CBN
   let ctx' = extend ctx nm a
   (tm', b) <- infer ctx' tm
-  putStrLn "make lam for \{show nm} scope \{pprint (names ctx) tm'} : \{show b}"
+  debug "make lam for \{show nm} scope \{pprint (names ctx) tm'} : \{show b}"
   pure $ (Lam nm tm', VPi nm icit a $ MkClosure ctx.env !(quote (S ctx.lvl) b))
   -- error {ctx} [DS "can't infer lambda"]
 

src/Lib/Parser.idr

@@ -12,7 +12,7 @@ import Lib.Types
 
 import Lib.Token
 import Lib.Parser.Impl
-import Syntax
+import Lib.Syntax
 import Data.List
 import Data.Maybe
 

src/Lib/ProcessDecl.idr

@@ -0,0 +1,96 @@
+module Lib.ProcessDecl
+
+import Data.IORef
+
+import Lib.Types
+import Lib.Parser
+import Lib.TT
+import Lib.TopContext
+import Lib.Check
+import Lib.Syntax
+
+export
+processDecl : Decl -> M ()
+processDecl (TypeSig nm tm) = do
+  top <- get
+  putStrLn "-----"
+  putStrLn "TypeSig \{nm} \{show tm}"
+  ty <- check (mkCtx top.metas) tm VU
+  ty' <- nf [] ty
+  putStrLn "got \{pprint [] ty'}"
+  modify $ claim nm ty'
+
+-- FIXME - this should be in another file
+processDecl (Def nm raw) = do
+  putStrLn "-----"
+  putStrLn "def \{show nm}"
+  ctx <- get
+  let pos = case raw of
+        RSrcPos pos _ => pos
+        _ => (0,0)
+
+  let Just entry = lookup nm ctx
+    | Nothing => throwError $ E pos "skip def \{nm} without Decl"
+  let (MkEntry name ty Axiom) := entry
+    | _ => throwError $ E pos "\{nm} already defined"
+  putStrLn "check \{nm} = \{show raw} at \{pprint [] ty}"
+  vty <- eval empty CBN ty
+  putStrLn "vty is \{show vty}"
+  tm <- check (mkCtx ctx.metas) raw vty
+  putStrLn "Ok \{pprint [] tm}"
+
+  mc <- readIORef ctx.metas
+  for_ mc.metas $ \case
+    (Solved k x) => pure ()
+    (Unsolved (l,c) k xs) => do
+      -- putStrLn "ERROR at (\{show l}, \{show c}): Unsolved meta \{show k}"
+      throwError $ E (l,c) "Unsolved meta \{show k}"
+
+  put (addDef ctx nm tm ty)
+
+processDecl (DCheck tm ty) = do
+
+  top <- get
+  putStrLn "check \{show tm} at \{show ty}"
+  ty' <- check (mkCtx top.metas) tm VU
+  putStrLn "got type \{pprint [] ty'}"
+  vty <- eval [] CBN ty'
+  res <- check (mkCtx top.metas) ty vty
+  putStrLn "got \{pprint [] res}"
+  norm <- nf [] res
+  putStrLn "norm \{pprint [] norm}"
+  -- top <- get
+  -- ctx <- mkCtx top.metas
+  -- I need a type to check against
+  -- norm <- nf [] x
+  putStrLn "NF "
+
+processDecl (DImport str) = throwError $ E (0,0) "import not implemented"
+
+processDecl (Data nm ty cons) = do
+  -- It seems like the FC for the errors are not here?
+  ctx <- get
+  tyty <- check (mkCtx ctx.metas) ty VU
+  -- TODO check tm is VU or Pi ending in VU
+  -- Maybe a pi -> binders function
+  -- TODO we're putting in axioms, we need constructors
+  -- for each constructor, check and add
+  modify $ claim nm tyty
+  ctx <- get
+  for_ cons $ \x => case x of
+      -- expecting tm to be a Pi type
+      (TypeSig nm' tm) => do
+          ctx <- get
+          -- TODO check pi type ending in full tyty application
+          dty <- check (mkCtx ctx.metas) tm VU
+          modify $ claim nm' dty
+      _ => throwError $ E (0,0) "expected TypeSig"
+
+  pure ()
+  where
+    checkDeclType : Tm -> M ()
+    checkDeclType U = pure ()
+    checkDeclType (Pi str icit t u) = checkDeclType u
+    checkDeclType _ = throwError $ E (0,0) "data type doesn't return U"
+
+

src/Lib/Syntax.idr

@@ -1,4 +1,4 @@
-module Syntax
+module Lib.Syntax
 
 import Data.String
 import Data.Maybe

src/Lib/TT.idr

@@ -174,6 +174,11 @@ export
 prval : Val -> M String
 prval v = pure $ pprint [] !(quote 0 v)
 
+export
+prvalCtx : {auto ctx : Context} -> Val -> M String
+prvalCtx v = pure $ pprint (toList $ map fst ctx.types) !(quote ctx.lvl v)
+
+
 export
 solveMeta : TopContext -> Nat -> Val -> M ()
 solveMeta ctx ix tm = do
@@ -185,6 +190,7 @@ solveMeta ctx ix tm = do
     go [] _ = error' "Meta \{show ix} not found"
     go (meta@(Unsolved pos k _) :: xs) lhs = if k == ix
       then do
+        -- empty context should be ok, because this needs to be closed
         putStrLn "INFO at \{show pos}: solve \{show k} as \{!(prval tm)}"
         pure $ lhs <>> (Solved k tm :: xs)
       else go xs (lhs :< meta)

src/Lib/TopContext.idr

@@ -18,11 +18,11 @@ lookup nm top = go top.defs
 -- Maybe pretty print?
 export
 Show TopContext where
-  show (MkTop defs metas) = "\nContext:\n [\{ joinBy "\n" $ map show defs}]"
+  show (MkTop defs metas _) = "\nContext:\n [\{ joinBy "\n" $ map show defs}]"
 
 public export
 empty : HasIO m => m TopContext
-empty = pure $ MkTop [] !(newIORef (MC [] 0))
+empty = pure $ MkTop [] !(newIORef (MC [] 0)) True
 
 public export
 claim : String -> Tm -> TopContext -> TopContext

src/Lib/Types.idr

@@ -4,20 +4,21 @@ module Lib.Types
 -- maybe watch https://www.youtube.com/watch?v=3gef0_NFz8Q
 -- or drop the indices for now.
 
--- For SourcePos
-import Lib.Parser.Impl
+-- For SourcePos, Error
+import public Lib.Parser.Impl
 import Lib.Prettier
 
 import public Control.Monad.Error.Either
 import public Control.Monad.Error.Interface
 import public Control.Monad.State
 
-import Data.IORef
 import Data.Fin
+import Data.IORef
 import Data.List
 import Data.SnocList
-import Data.Vect
 import Data.SortedMap
+import Data.String
+import Data.Vect
 
 public export
 Name : Type
@@ -87,6 +88,7 @@ Eq (Tm) where
   (Pi n icit t u) == (Pi n' icit' t' u') = icit == icit' && t == t' && u == u'
   _ == _ = False
 
+-- FIXME prec
 
 export
 pprint : List String -> Tm -> String
@@ -101,8 +103,10 @@ pprint names tm = render 80 $ go names tm
     go names (Lam nm t) = text "(\\ \{nm} =>" <+> go (nm :: names) t <+> ")"
     go names (App t u) = text "(" <+> go names t <+> go names u <+> ")"
     go names U = "U"
-    go names (Pi nm icit t u) =
-      text "(" <+> text nm <+> ":" <+> go names t <+> ")" <+> "=>" <+> go (nm :: names) u <+> ")"
+    go names (Pi nm Implicit t u) =
+      text "({" <+> text nm <+> ":" <+> go names t <+> "}" <+> "=>" <+> go (nm :: names) u <+> ")"
+    go names (Pi nm Explicit t u) =
+      text "((" <+> text nm <+> ":" <+> go names t <+> ")" <+> "=>" <+> go (nm :: names) u <+> ")"
 
 public export
 Pretty Tm where
@@ -159,12 +163,13 @@ Show Val where
   show (VPi str Explicit x y) = "(%pi (\{str} : \{show  x}). \{show  y})"
   show VU = "U"
 
-
--- Not used yet
+-- Not used - I was going to change context to have a List Binder
+-- instead of env, types, bds
+-- But when we get down into eval, we don't have types to put into the env
 data Binder : Type where
   Bind : (nm : String) -> (bd : BD) -> (val : Val) -> (ty : Val) -> Binder
 
-export covering
+covering
 Show Binder where
   show (Bind nm bd val ty) = "(\{show bd} \{show nm} \{show val} : \{show ty})"
 
@@ -260,6 +265,7 @@ record TopContext where
   -- We'll add a map later?
   defs : List TopEntry
   metas : IORef MetaContext
+  verbose : Bool
   -- metas : TODO
 
 
@@ -267,6 +273,7 @@ record TopContext where
 -- we'll use this for typechecking, but need to keep a TopContext around too.
 public export
 record Context where
+  [noHints]
   constructor MkCtx
   lvl : Nat
   -- shall we use lvl as an index?
@@ -294,3 +301,17 @@ M = (StateT TopContext (EitherT Impl.Error IO))
 export
 mkCtx : IORef MetaContext -> Context
 mkCtx metas = MkCtx 0 [] [] [] (0,0) metas
+
+||| Force argument and print if verbose is true
+export
+debug : Lazy String -> M ()
+debug x = do
+  top <- get
+  when top.verbose $ putStrLn x
+
+||| Version of debug that makes monadic computation lazy
+export
+debugM : M String -> M ()
+debugM x = do
+  top <- get
+  when top.verbose $ do putStrLn !(x)

src/Main.idr

@@ -8,17 +8,18 @@ import Data.List
 import Data.String
 import Data.Vect
 import Data.IORef
-import Lib.Check
+-- import Lib.Check
 import Lib.Parser
-import Lib.Parser.Impl
+-- import Lib.Parser.Impl
 import Lib.Prettier
+import Lib.ProcessDecl
 import Lib.Token
 import Lib.Tokenizer
 import Lib.TopContext
 import Lib.Types
-import Lib.TT
-import Syntax
-import Syntax
+-- import Lib.TT
+import Lib.Syntax
+import Lib.Syntax
 import System
 import System.Directory
 import System.File
@@ -45,89 +46,6 @@ dumpContext top = do
     go [] = pure ()
     go (x :: xs) = go xs >> putStrLn "    \{show x}"
 
-processDecl : Decl -> M ()
-processDecl (TypeSig nm tm) = do
-  top <- get
-  putStrLn "-----"
-  putStrLn "TypeSig \{nm} \{show tm}"
-  ty <- check (mkCtx top.metas) tm VU
-  ty' <- nf [] ty
-  putStrLn "got \{pprint [] ty'}"
-  modify $ claim nm ty'
-
--- FIXME - this should be in another file
-processDecl (Def nm raw) = do
-  putStrLn "-----"
-  putStrLn "def \{show nm}"
-  ctx <- get
-  let pos = case raw of
-        RSrcPos pos _ => pos
-        _ => (0,0)
-
-  let Just entry = lookup nm ctx
-    | Nothing => throwError $ E pos "skip def \{nm} without Decl"
-  let (MkEntry name ty Axiom) := entry
-    | _ => throwError $ E pos "\{nm} already defined"
-  putStrLn "check \{nm} = \{show raw} at \{pprint [] ty}"
-  vty <- eval empty CBN ty
-  putStrLn "vty is \{show vty}"
-  tm <- check (mkCtx ctx.metas) raw vty
-  putStrLn "Ok \{pprint [] tm}"
-
-  mc <- readIORef ctx.metas
-  for_ mc.metas $ \case
-    (Solved k x) => pure ()
-    (Unsolved (l,c) k xs) => do
-      -- putStrLn "ERROR at (\{show l}, \{show c}): Unsolved meta \{show k}"
-      throwError $ E (l,c) "Unsolved meta \{show k}"
-
-  put (addDef ctx nm tm ty)
-
-processDecl (DCheck tm ty) = do
-
-  top <- get
-  putStrLn "check \{show tm} at \{show ty}"
-  ty' <- check (mkCtx top.metas) tm VU
-  putStrLn "got type \{pprint [] ty'}"
-  vty <- eval [] CBN ty'
-  res <- check (mkCtx top.metas) ty vty
-  putStrLn "got \{pprint [] res}"
-  norm <- nf [] res
-  putStrLn "norm \{pprint [] norm}"
-  -- top <- get
-  -- ctx <- mkCtx top.metas
-  -- I need a type to check against
-  -- norm <- nf [] x
-  putStrLn "NF "
-
-processDecl (DImport str) = throwError $ E (0,0) "import not implemented"
-
-processDecl (Data nm ty cons) = do
-  -- It seems like the FC for the errors are not here?
-  ctx <- get
-  tyty <- check (mkCtx ctx.metas) ty VU
-  -- TODO check tm is VU or Pi ending in VU
-  -- Maybe a pi -> binders function
-  -- TODO we're putting in axioms, we need constructors
-  -- for each constructor, check and add
-  modify $ claim nm tyty
-  ctx <- get
-  for_ cons $ \x => case x of
-      -- expecting tm to be a Pi type
-      (TypeSig nm' tm) => do
-          ctx <- get
-          -- TODO check pi type ending in full tyty application
-          dty <- check (mkCtx ctx.metas) tm VU
-          modify $ claim nm' dty
-      _ => throwError $ E (0,0) "expected TypeSig"
-
-  pure ()
-  where
-    checkDeclType : Tm -> M ()
-    checkDeclType U = pure ()
-    checkDeclType (Pi str icit t u) = checkDeclType u
-    checkDeclType _ = throwError $ E (0,0) "data type doesn't return U"
-
 processFile : String -> M ()
 processFile fn = do
   putStrLn "*** Process \{fn}"