import Outputable
import FastString
+import Control.Monad( when )
import qualified Data.Map as Map
\end{code}
-> [EquationInfo] -- Info about patterns, etc. (type synonym below)
-> DsM MatchResult -- Desugared result!
-matchCheck ctx vars ty qs = do
- dflags <- getDOptsDs
- matchCheck_really dflags ctx vars ty qs
+matchCheck ctx vars ty qs
+ = do { dflags <- getDOptsDs
+ ; matchCheck_really dflags ctx vars ty qs }
matchCheck_really :: DynFlags
-> DsMatchContext
-> Type
-> [EquationInfo]
-> DsM MatchResult
-matchCheck_really dflags ctx vars ty qs
- | incomplete && shadow = do
- dsShadowWarn ctx eqns_shadow
- dsIncompleteWarn ctx pats
- match vars ty qs
- | incomplete = do
- dsIncompleteWarn ctx pats
- match vars ty qs
- | shadow = do
- dsShadowWarn ctx eqns_shadow
- match vars ty qs
- | otherwise =
- match vars ty qs
- where (pats, eqns_shadow) = check qs
- incomplete = want_incomplete && (notNull pats)
- want_incomplete = case ctx of
- DsMatchContext RecUpd _ ->
- dopt Opt_WarnIncompletePatternsRecUpd dflags
- _ ->
- dopt Opt_WarnIncompletePatterns dflags
- shadow = dopt Opt_WarnOverlappingPatterns dflags
- && not (null eqns_shadow)
+matchCheck_really dflags ctx@(DsMatchContext hs_ctx _) vars ty qs
+ = do { when shadow (dsShadowWarn ctx eqns_shadow)
+ ; when incomplete (dsIncompleteWarn ctx pats)
+ ; match vars ty qs }
+ where
+ (pats, eqns_shadow) = check qs
+ incomplete = incomplete_flag hs_ctx && (notNull pats)
+ shadow = dopt Opt_WarnOverlappingPatterns dflags
+ && notNull eqns_shadow
+
+ incomplete_flag :: HsMatchContext id -> Bool
+ incomplete_flag (FunRhs {}) = dopt Opt_WarnIncompletePatterns dflags
+ incomplete_flag CaseAlt = dopt Opt_WarnIncompletePatterns dflags
+
+ incomplete_flag LambdaExpr = dopt Opt_WarnIncompleteUniPatterns dflags
+ incomplete_flag PatBindRhs = dopt Opt_WarnIncompleteUniPatterns dflags
+ incomplete_flag ProcExpr = dopt Opt_WarnIncompleteUniPatterns dflags
+
+ incomplete_flag RecUpd = dopt Opt_WarnIncompletePatternsRecUpd dflags
+
+ incomplete_flag ThPatQuote = False
+ incomplete_flag (StmtCtxt {}) = False -- Don't warn about incomplete patterns
+ -- in list comprehensions, pattern guards
+ -- etc. They are often *supposed* to be
+ -- incomplete
\end{code}
This variable shows the maximum number of lines of output generated for warnings.
= ASSERT( not (null eqns ) )
do { -- Tidy the first pattern, generating
-- auxiliary bindings if necessary
- (aux_binds, tidy_eqns) <- mapAndUnzipM (tidyEqnInfo v) eqns
+ (aux_binds, tidy_eqns) <- mapAndUnzipM (tidyEqnInfo v) eqns
-- Group the equations and match each group in turn
- ; let grouped = groupEquations tidy_eqns
+ ; let grouped = groupEquations tidy_eqns
-- print the view patterns that are commoned up to help debug
- ; ifDOptM Opt_D_dump_view_pattern_commoning (debug grouped)
+ ; ifDOptM Opt_D_dump_view_pattern_commoning (debug grouped)
; match_results <- mapM match_group grouped
; return (adjustMatchResult (foldr1 (.) aux_binds) $
matchBangs :: [Id] -> Type -> [EquationInfo] -> DsM MatchResult
matchBangs (var:vars) ty eqns
- = do { match_result <- match (var:vars) ty (map decomposeFirst_Bang eqns)
+ = do { match_result <- match (var:vars) ty $
+ map (decomposeFirstPat getBangPat) eqns
; return (mkEvalMatchResult var ty match_result) }
matchBangs [] _ _ = panic "matchBangs"
matchCoercion (var:vars) ty (eqns@(eqn1:_))
= do { let CoPat co pat _ = firstPat eqn1
; var' <- newUniqueId var (hsPatType pat)
- ; match_result <- match (var':vars) ty (map decomposeFirst_Coercion eqns)
+ ; match_result <- match (var':vars) ty $
+ map (decomposeFirstPat getCoPat) eqns
; co' <- dsHsWrapper co
; let rhs' = co' (Var var)
; return (mkCoLetMatchResult (NonRec var' rhs') match_result) }
let ViewPat viewExpr (L _ pat) _ = firstPat eqn1
-- do the rest of the compilation
; var' <- newUniqueId var (hsPatType pat)
- ; match_result <- match (var':vars) ty (map decomposeFirst_View eqns)
+ ; match_result <- match (var':vars) ty $
+ map (decomposeFirstPat getViewPat) eqns
-- compile the view expressions
; viewExpr' <- dsLExpr viewExpr
; return (mkViewMatchResult var' viewExpr' var match_result) }
= eqn { eqn_pats = extractpat pat : pats}
decomposeFirstPat _ _ = panic "decomposeFirstPat"
-decomposeFirst_Coercion, decomposeFirst_Bang, decomposeFirst_View :: EquationInfo -> EquationInfo
-
-decomposeFirst_Coercion = decomposeFirstPat (\ (CoPat _ pat _) -> pat)
-decomposeFirst_Bang = decomposeFirstPat (\ (BangPat pat ) -> unLoc pat)
-decomposeFirst_View = decomposeFirstPat (\ (ViewPat _ pat _) -> unLoc pat)
-
+getCoPat, getBangPat, getViewPat :: Pat Id -> Pat Id
+getCoPat (CoPat _ pat _) = pat
+getCoPat _ = panic "getCoPat"
+getBangPat (BangPat pat ) = unLoc pat
+getBangPat _ = panic "getBangPat"
+getViewPat (ViewPat _ pat _) = unLoc pat
+getViewPat _ = panic "getBangPat"
\end{code}
%************************************************************************
tidy1 v (VarPat var)
= return (wrapBind var v, WildPat (idType var))
-tidy1 v (VarPatOut var binds)
- = do { ds_ev_binds <- dsTcEvBinds binds
- ; return (wrapBind var v . wrapDsEvBinds ds_ev_binds,
- WildPat (idType var)) }
-
-- case v of { x@p -> mr[] }
-- = case v of { p -> let x=v in mr[] }
tidy1 v (AsPat (L _ var) pat)
tidy1 v (BangPat (L _ (LazyPat p))) = tidy1 v (BangPat p)
tidy1 v (BangPat (L _ (ParPat p))) = tidy1 v (BangPat p)
tidy1 _ p@(BangPat (L _(VarPat _))) = return (idDsWrapper, p)
-tidy1 _ p@(BangPat (L _(VarPatOut _ _))) = return (idDsWrapper, p)
tidy1 _ p@(BangPat (L _ (WildPat _))) = return (idDsWrapper, p)
tidy1 _ p@(BangPat (L _ (CoPat _ _ _))) = return (idDsWrapper, p)
tidy1 _ p@(BangPat (L _ (SigPatIn _ _))) = return (idDsWrapper, p)
match_result' <- matchSinglePat scrut hs_ctx pat rhs_ty match_result
extractMatchResult match_result' fail_expr
-
matchSinglePat :: CoreExpr -> HsMatchContext Name -> LPat Id
-> Type -> MatchResult -> DsM MatchResult
-- Do not warn about incomplete patterns
-- Used for things like [ e | pat <- stuff ], where
-- incomplete patterns are just fine
-matchSinglePat (Var var) _ (L _ pat) ty match_result
- = match [var] ty [EqnInfo { eqn_pats = [pat], eqn_rhs = match_result }]
-
-matchSinglePat scrut hs_ctx pat ty match_result = do
- var <- selectSimpleMatchVarL pat
- match_result' <- matchSinglePat (Var var) hs_ctx pat ty match_result
- return (adjustMatchResult (bindNonRec var scrut) match_result')
+matchSinglePat (Var var) ctx (L _ pat) ty match_result
+ = do { locn <- getSrcSpanDs
+ ; matchCheck (DsMatchContext ctx locn)
+ [var] ty
+ [EqnInfo { eqn_pats = [pat], eqn_rhs = match_result }] }
+
+matchSinglePat scrut hs_ctx pat ty match_result
+ = do { var <- selectSimpleMatchVarL pat
+ ; match_result' <- matchSinglePat (Var var) hs_ctx pat ty match_result
+ ; return (adjustMatchResult (bindNonRec var scrut) match_result') }
\end{code}
lexp e1 e1' && lexp e2 e2'
exp (ExplicitTuple es1 _) (ExplicitTuple es2 _) =
eq_list tup_arg es1 es2
- exp (HsIf e e1 e2) (HsIf e' e1' e2') =
+ exp (HsIf _ e e1 e2) (HsIf _ e' e1' e2') =
lexp e e' && lexp e1 e1' && lexp e2 e2'
-- Enhancement: could implement equality for more expressions
projects / ghc-hetmet.git / blobdiff