Make 'with' work in where blocks

Need to set up nested names appropriately for the with function so that
the environment gets passed through correctly, and use abstractEnvType
to get the type of the with function rather than simply binding the
environment as is.

src/TTImp/ProcessDef.idr

@@ -256,7 +256,8 @@ plicit (Pi _ p _) = p
 plicit (PVar _ p _) = p
 plicit _ = Explicit
 
-bindNotReq : FC -> Int -> Env Term vs -> (sub : SubVars pre vs) -> 
+bindNotReq : {vs : _} ->
+             FC -> Int -> Env Term vs -> (sub : SubVars pre vs) -> 
              List (PiInfo, Name) ->
              Term vs -> (List (PiInfo, Name), Term pre)
 bindNotReq fc i [] SubRefl ns tm = (ns, embed tm)
@@ -272,11 +273,13 @@ bindNotReq {vs = n :: _} fc i (b :: env) (DropCons p) ns tm
    = bindNotReq fc i env p ((plicit b, n) :: ns)
        (Bind fc _ (Pi (multiplicity b) Explicit (binderType b)) tm)
 
-bindReq : FC -> Env Term vs -> (sub : SubVars pre vs) -> 
+bindReq : {vs : _} ->
+          FC -> Env Term vs -> (sub : SubVars pre vs) -> 
           List (PiInfo, Name) ->
-          Term pre -> Maybe (List (PiInfo, Name), ClosedTerm)
-bindReq fc env SubRefl ns tm = pure (ns, bindEnv fc env tm)
-bindReq fc {vs = n :: _} (b :: env) (KeepCons p) ns tm 
+          Term pre -> Maybe (List (PiInfo, Name), List Name, ClosedTerm)
+bindReq {vs} fc env SubRefl ns tm 
+    = pure (ns, reverse vs, abstractEnvType fc env tm)
+bindReq {vs = n :: _} fc (b :: env) (KeepCons p) ns tm 
     = do b' <- shrinkBinder b p
          bindReq fc env p ((plicit b, n) :: ns)
             (Bind fc _ (Pi (multiplicity b) Explicit (binderType b')) tm)
@@ -398,6 +401,16 @@ withRHS fc drop wname wargnames tm toplhs
       wrhsC (PatClause fc lhs rhs) = pure $ PatClause fc lhs !(wrhs rhs)
       wrhsC c = pure c
     
+-- For checking with blocks as nested names
+applyEnv : {auto c : Ref Ctxt Defs} ->
+           Env Term vars -> Name -> 
+           Core (Name, (Maybe Name, FC -> NameType -> Term vars))
+applyEnv env withname
+    = do n' <- resolveName withname
+         pure (withname, (Just withname, 
+                  \fc, nt => applyTo fc 
+                         (Ref fc nt (Resolved n')) env))
+
 -- Check a pattern clause, returning the component of the 'Case' expression it
 -- represents, or Nothing if it's an impossible clause
 export
@@ -457,6 +470,7 @@ checkClause {vars} mult hashit n opts nest env (PatClause fc lhs_in rhs)
               _ => pure ()
 
          pure (Just (MkClause env' lhstm' rhstm))
+-- TODO: (to decide) With is complicated. Move this into its own module?
 checkClause {vars} mult hashit n opts nest env (WithClause fc lhs_in wval_raw cs)
     = do (vars'  ** (sub', env', nest', lhspat, reqty)) <- 
              checkLHS mult hashit n opts nest env fc lhs_in
@@ -470,7 +484,7 @@ checkClause {vars} mult hashit n opts nest env (WithClause fc lhs_in wval_raw cs
          clearHoleLHS
          
          logTerm 5 "With value" wval
-         logTerm 5 "Required type" reqty
+         logTerm 3 "Required type" reqty
          wvalTy <- getTerm gwvalTy
          defs <- get Ctxt
          wval <- normaliseHoles defs env' wval
@@ -504,7 +518,7 @@ checkClause {vars} mult hashit n opts nest env (WithClause fc lhs_in wval_raw cs
                                  (weaken {n=wargn} notreqty))
          let bNotReq = Bind fc wargn (Pi RigW Explicit wvalTy) wtyScope
 
-         let Just (reqns, wtype) = bindReq fc env' withSub [] bNotReq
+         let Just (reqns, envns, wtype) = bindReq fc env' withSub [] bNotReq
              | Nothing => throw (InternalError "Impossible happened: With abstraction failure #4")
 
          -- list of argument names - 'Just' means we need to match the name
@@ -514,24 +528,30 @@ checkClause {vars} mult hashit n opts nest env (WithClause fc lhs_in wval_raw cs
                  = map Just reqns ++ 
                    Nothing :: map Just notreqns
 
-         logTerm 5 "With function type" wtype 
+         logTerm 3 "With function type" wtype 
          log 5 $ "Argument names " ++ show wargNames
 
          wname <- genWithName n
          widx <- addDef wname (newDef fc wname mult vars wtype Private None)
          let rhs_in = apply (IVar fc wname)
-                        (map (maybe wval_raw (\pn => IVar fc (snd pn))) wargNames)
+                        (map (IVar fc) envns ++
+                         map (maybe wval_raw (\pn => IVar fc (snd pn))) wargNames)
 
+         log 3 $ "Applying to with argument " ++ show rhs_in
          rhs <- wrapError (InRHS fc !(getFullName (Resolved n))) $
              checkTermSub n wmode opts nest' env' env sub' rhs_in 
                           (gnf env' reqty)
 
          -- Generate new clauses by rewriting the matched arguments
          cs' <- traverse (mkClauseWith 1 wname wargNames lhs_in) cs
+         log 3 $ "With clauses: " ++ show cs'
 
          -- Elaborate the new definition here
+         nestname <- applyEnv env wname
+         let nest'' = record { names $= (nestname ::) } nest
+
          let wdef = IDef fc wname cs'
-         processDecl [] nest env wdef
+         processDecl [] nest'' env wdef
 
          pure (Just (MkClause env' lhspat rhs))
   where

support/chez/support.ss

@@ -170,6 +170,8 @@
         (micro (mod s 1000000)))
        (sleep (make-time 'time-duration (* 1000 micro) sec))))
 
+(define (blodwen-time) (time-second (current-time)))
+
 (define (blodwen-args)
   (define (blodwen-build-args args)
     (if (null? args)