Matching guarded right-hand-sides (GRHSs)
\begin{code}
-{-# OPTIONS -w #-}
+{-# OPTIONS -fno-warn-incomplete-patterns #-}
-- 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
module DsGRHSs ( dsGuarded, dsGRHSs ) where
+-- XXX This define is a bit of a hack, and should be done more nicely
+#define FAST_STRING_NOT_NEEDED 1
#include "HsVersions.h"
import {-# SOURCE #-} DsExpr ( dsLExpr, dsLocalBinds )
-> GRHSs Id -- Guarded RHSs
-> Type -- Type of RHS
-> DsM MatchResult
-dsGRHSs hs_ctx pats grhssa@(GRHSs grhss binds) rhs_ty = do
+dsGRHSs hs_ctx pats (GRHSs grhss binds) rhs_ty = do
match_results <- mapM (dsGRHS hs_ctx pats rhs_ty) grhss
let
match_result1 = foldr1 combineMatchResults match_results
--
return match_result2
-dsGRHS hs_ctx pats rhs_ty (L loc (GRHS guards rhs))
+dsGRHS :: HsMatchContext Name -> [Pat Id] -> Type -> LGRHS Id -> DsM MatchResult
+dsGRHS hs_ctx _ rhs_ty (L _ (GRHS guards rhs))
= matchGuards (map unLoc guards) hs_ctx rhs rhs_ty
\end{code}
-- See comments with HsExpr.Stmt re what an ExprStmt means
-- Here we must be in a guard context (not do-expression, nor list-comp)
-matchGuards [] ctx rhs rhs_ty
+matchGuards [] _ rhs _
= do { core_rhs <- dsLExpr rhs
; return (cantFailMatchResult core_rhs) }
|| v `hasKey` getUnique trueDataConId
= Just return
-- trueDataConId doesn't have the same unique as trueDataCon
-isTrueLHsExpr (L loc (HsTick ix frees e))
+isTrueLHsExpr (L _ (HsTick ix frees e))
| Just ticks <- isTrueLHsExpr e = Just (\x -> ticks x >>= mkTickBox ix frees)
-- This encodes that the result is constant True for Hpc tick purposes;
-- which is specifically what isTrueLHsExpr is trying to find out.
-isTrueLHsExpr (L loc (HsBinTick ixT _ e))
+isTrueLHsExpr (L _ (HsBinTick ixT _ e))
| Just ticks <- isTrueLHsExpr e = Just (\x -> ticks x >>= mkTickBox ixT [])
isTrueLHsExpr (L _ (HsPar e)) = isTrueLHsExpr e
-isTrueLHsExpr other = Nothing
+isTrueLHsExpr _ = Nothing
\end{code}
Should {\em fail} if @e@ returns @D@