-- The above warning supression flag is a temporary kludge.
-- While working on this module you are encouraged to remove it and fix
-- any warnings in the module. See
--- http://hackage.haskell.org/trac/ghc/wiki/CodingStyle#Warnings
+-- http://hackage.haskell.org/trac/ghc/wiki/Commentary/CodingStyle#Warnings
-- for details
module TcArrows ( tcProc ) where
import TcPat
import TcUnify
import TcRnMonad
+import Coercion
import Inst
import Name
import TysWiredIn
\begin{code}
tcProc :: InPat Name -> LHsCmdTop Name -- proc pat -> expr
-> BoxyRhoType -- Expected type of whole proc expression
- -> TcM (OutPat TcId, LHsCmdTop TcId)
+ -> TcM (OutPat TcId, LHsCmdTop TcId, CoercionI)
tcProc pat cmd exp_ty
= newArrowScope $
- do { (exp_ty1, res_ty) <- boxySplitAppTy exp_ty
- ; (arr_ty, arg_ty) <- boxySplitAppTy exp_ty1
+ 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') <- tcLamPat pat arg_ty (emptyRefinement, res_ty) $
tcCmdTop cmd_env cmd []
- ; return (pat', cmd') }
+ ; let res_coi = mkTransCoI coi (mkAppTyCoI exp_ty1 coi1 res_ty IdCo)
+ ; return (pat', cmd', res_coi)
+ }
\end{code}