module TcArrows ( tcProc ) where
-#include "HsVersions.h"
-
import {-# SOURCE #-} TcExpr( tcMonoExpr, tcInferRho )
import HsSyn
import TcMType
import TcBinds
import TcSimplify
-import TcGadt
import TcPat
import TcUnify
import TcRnMonad
import SrcLoc
import Outputable
+import FastString
import Util
import Control.Monad
do { ((exp_ty1, res_ty), coi) <- boxySplitAppTy exp_ty
; ((arr_ty, arg_ty), coi1) <- boxySplitAppTy exp_ty1
; let cmd_env = CmdEnv { cmd_arr = arr_ty }
- ; (pat', cmd') <- tcProcPat pat arg_ty (emptyRefinement, res_ty) $
+ ; (pat', cmd') <- tcProcPat pat arg_ty res_ty $
tcCmdTop cmd_env cmd []
; let res_coi = mkTransCoI coi (mkAppTyCoI exp_ty1 coi1 res_ty IdCo)
; return (pat', cmd', res_coi)
tcCmdTop :: CmdEnv
-> LHsCmdTop Name
-> CmdStack
- -> (Refinement, TcTauType) -- Expected result type; always a monotype
- -- We know exactly how many cmd args are expected,
- -- albeit perhaps not their types; so we can pass
- -- in a CmdStack
+ -> TcTauType -- Expected result type; always a monotype
+ -- We know exactly how many cmd args are expected,
+ -- albeit perhaps not their types; so we can pass
+ -- in a CmdStack
-> TcM (LHsCmdTop TcId)
-tcCmdTop env (L loc (HsCmdTop cmd _ _ names)) cmd_stk reft_res_ty@(_,res_ty)
+tcCmdTop env (L loc (HsCmdTop cmd _ _ names)) cmd_stk res_ty
= setSrcSpan loc $
- do { cmd' <- tcGuardedCmd env cmd cmd_stk reft_res_ty
+ do { cmd' <- tcGuardedCmd env cmd cmd_stk res_ty
; names' <- mapM (tcSyntaxName ProcOrigin (cmd_arr env)) names
; return (L loc $ HsCmdTop cmd' cmd_stk res_ty names') }
----------------------------------------
tcGuardedCmd :: CmdEnv -> LHsExpr Name -> CmdStack
- -> (Refinement, TcTauType) -> TcM (LHsExpr TcId)
+ -> TcTauType -> TcM (LHsExpr TcId)
-- A wrapper that deals with the refinement (if any)
-tcGuardedCmd env expr stk (reft, res_ty)
- = do { let (co, res_ty') = refineResType reft res_ty
- ; body <- tcCmd env expr (stk, res_ty')
- ; return (mkLHsWrap co body) }
+tcGuardedCmd env expr stk res_ty
+ = do { body <- tcCmd env expr (stk, res_ty)
+ ; return body
+ }
tcCmd :: CmdEnv -> LHsExpr Name -> (CmdStack, TcTauType) -> TcM (LHsExpr TcId)
-- The main recursive function
tc_cmd env cmd@(HsDo do_or_lc stmts body ty) (cmd_stk, res_ty)
= do { checkTc (null cmd_stk) (nonEmptyCmdStkErr cmd)
- ; (stmts', body') <- tcStmts do_or_lc tc_stmt stmts (emptyRefinement, res_ty) $
+ ; (stmts', body') <- tcStmts do_or_lc tc_stmt stmts res_ty $
tcGuardedCmd env body []
; return (HsDo do_or_lc stmts' body' res_ty) }
where
not (w_tv `elemVarSet` tyVarsOfTypes arg_tys))
(badFormFun i tup_ty')
- ; tcCmdTop (env { cmd_arr = b }) cmd arg_tys (emptyRefinement, s) }
+ ; tcCmdTop (env { cmd_arr = b }) cmd arg_tys s }
unscramble :: TcType -> (TcType, [TcType])
-- unscramble ((w,s1) .. sn) = (w, [s1..sn])
-- This is where expressions that aren't commands get rejected
tc_cmd env cmd _
- = failWithTc (vcat [ptext SLIT("The expression"), nest 2 (ppr cmd),
- ptext SLIT("was found where an arrow command was expected")])
+ = failWithTc (vcat [ptext (sLit "The expression"), nest 2 (ppr cmd),
+ ptext (sLit "was found where an arrow command was expected")])
\end{code}
%************************************************************************
\begin{code}
-cmdCtxt cmd = ptext SLIT("In the command:") <+> ppr cmd
+cmdCtxt cmd = ptext (sLit "In the command:") <+> ppr cmd
caseScrutCtxt cmd
- = hang (ptext SLIT("In the scrutinee of a case command:")) 4 (ppr cmd)
+ = hang (ptext (sLit "In the scrutinee of a case command:")) 4 (ppr cmd)
nonEmptyCmdStkErr cmd
- = hang (ptext SLIT("Non-empty command stack at command:"))
+ = hang (ptext (sLit "Non-empty command stack at command:"))
4 (ppr cmd)
kappaUnderflow cmd
- = hang (ptext SLIT("Command stack underflow at command:"))
+ = hang (ptext (sLit "Command stack underflow at command:"))
4 (ppr cmd)
badFormFun i tup_ty'
- = hang (ptext SLIT("The type of the") <+> speakNth i <+> ptext SLIT("argument of a command form has the wrong shape"))
- 4 (ptext SLIT("Argument type:") <+> ppr tup_ty')
+ = hang (ptext (sLit "The type of the") <+> speakNth i <+> ptext (sLit "argument of a command form has the wrong shape"))
+ 4 (ptext (sLit "Argument type:") <+> ppr tup_ty')
\end{code}