import {-# SOURCE #-} Match ( matchSinglePat )
import HsSyn
-import HsUtils
import CoreSyn
import Var
import Type
import DsMonad
import DsUtils
-import Unique
import PrelInfo
import TysWiredIn
import PrelNames
-> GRHSs Id -- Guarded RHSs
-> Type -- Type of RHS
-> DsM MatchResult
-dsGRHSs hs_ctx pats grhssa@(GRHSs grhss binds) rhs_ty =
- bindLocalsDs binders $ do
+dsGRHSs hs_ctx pats grhssa@(GRHSs grhss binds) rhs_ty = do
match_results <- mappM (dsGRHS hs_ctx pats rhs_ty) grhss
let
match_result1 = foldr1 combineMatchResults match_results
match_result2 = adjustMatchResultDs
- (\e -> bindLocalsDs binders $
- dsLocalBinds binds e)
+ (\e -> dsLocalBinds binds e)
match_result1
-- NB: nested dsLet inside matchResult
--
returnDs match_result2
- where bindsBinders = map unLoc (collectLocalBinders binds)
- patsBinders = collectPatsBinders (map (L undefined) pats)
- binders = bindsBinders ++ patsBinders
dsGRHS hs_ctx pats rhs_ty (L loc (GRHS guards rhs))
= matchGuards (map unLoc guards) hs_ctx rhs rhs_ty
returnDs (mkGuardedMatchResult pred_expr match_result)
matchGuards (LetStmt binds : stmts) ctx rhs rhs_ty
- = bindLocalsDs (map unLoc $ collectLocalBinders binds) $
- matchGuards stmts ctx rhs rhs_ty `thenDs` \ match_result ->
+ = matchGuards stmts ctx rhs rhs_ty `thenDs` \ match_result ->
returnDs (adjustMatchResultDs (dsLocalBinds binds) match_result)
-- NB the dsLet occurs inside the match_result
-- Reason: dsLet takes the body expression as its argument
-- body expression in hand
matchGuards (BindStmt pat bind_rhs _ _ : stmts) ctx rhs rhs_ty
- = bindLocalsDs (collectPatBinders pat) $
- matchGuards stmts ctx rhs rhs_ty `thenDs` \ match_result ->
+ = matchGuards stmts ctx rhs rhs_ty `thenDs` \ match_result ->
dsLExpr bind_rhs `thenDs` \ core_rhs ->
matchSinglePat core_rhs ctx pat rhs_ty match_result
\end{code}