X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;ds=sidebyside;f=ghc%2Fcompiler%2Fmain%2FCmdLineOpts.lhs;h=348831a1553dc02ada03a6b3f2eb4aef5e25e6d9;hb=f98aaf1088d0b654ebf6c887c7dbebe5bb6f5f5f;hp=cf3d9e197fcda17e6045b089b9c741d26792ba28;hpb=35fb1e382c4561fbd8e1ad66cd515c706e62be41;p=ghc-hetmet.git diff --git a/ghc/compiler/main/CmdLineOpts.lhs b/ghc/compiler/main/CmdLineOpts.lhs index cf3d9e1..348831a 100644 --- a/ghc/compiler/main/CmdLineOpts.lhs +++ b/ghc/compiler/main/CmdLineOpts.lhs @@ -1,5 +1,5 @@ % -% (c) The AQUA Project, Glasgow University, 1996-98 +% (c) The University of Glasgow, 1996-2000 % \section[CmdLineOpts]{Things to do with command-line options} @@ -7,75 +7,28 @@ module CmdLineOpts ( CoreToDo(..), - SimplifierSwitch(..), + SimplifierSwitch(..), isAmongSimpl, StgToDo(..), SwitchResult(..), - classifyOpts, + HscLang(..), + DynFlag(..), -- needed non-abstractly by DriverFlags + DynFlags(..), intSwitchSet, switchIsOn, - - -- debugging opts - dopt_D_dump_absC, - dopt_D_dump_asm, - dopt_D_dump_cpranal, - dopt_D_dump_cse, - dopt_D_dump_deriv, - dopt_D_dump_ds, - dopt_D_dump_flatC, - dopt_D_dump_foreign, - dopt_D_dump_hi_diffs, - dopt_D_dump_inlinings, - dopt_D_dump_occur_anal, - dopt_D_dump_parsed, - dopt_D_dump_realC, - dopt_D_dump_rn, - dopt_D_dump_rules, - dopt_D_dump_simpl, - dopt_D_dump_simpl_iterations, - dopt_D_dump_simpl_stats, - dopt_D_dump_spec, - dopt_D_dump_stg, - dopt_D_dump_stranal, - dopt_D_dump_tc, - dopt_D_dump_types, - dopt_D_dump_usagesp, - dopt_D_dump_worker_wrapper, - dopt_D_show_passes, - dopt_D_dump_rn_trace, - dopt_D_dump_rn_stats, - dopt_D_dump_stix, - dopt_D_dump_minimal_imports, - dopt_D_source_stats, - dopt_D_verbose_core2core, - dopt_D_verbose_stg2stg, - dopt_DoCoreLinting, - dopt_DoStgLinting, - dopt_DoUSPLinting, + isStaticHscFlag, opt_PprStyle_NoPrags, opt_PprUserLength, opt_PprStyle_Debug, + dopt, + -- other dynamic flags dopt_CoreToDo, dopt_StgToDo, - - -- warning opts - opt_WarnDuplicateExports, - opt_WarnHiShadows, - opt_WarnIncompletePatterns, - opt_WarnMissingFields, - opt_WarnMissingMethods, - opt_WarnMissingSigs, - opt_WarnNameShadowing, - opt_WarnOverlappingPatterns, - opt_WarnSimplePatterns, - opt_WarnTypeDefaults, - opt_WarnUnusedBinds, - opt_WarnUnusedImports, - opt_WarnUnusedMatches, - opt_WarnDeprecations, + dopt_HscLang, + dopt_OutName, -- profiling opts opt_AutoSccsOnAllToplevs, @@ -89,10 +42,6 @@ module CmdLineOpts ( opt_AllStrict, opt_DictsStrict, opt_MaxContextReductionDepth, - dopt_AllowOverlappingInstances, - dopt_AllowUndecidableInstances, - dopt_GlasgowExts, - opt_Generics, opt_IrrefutableTuples, opt_NumbersStrict, opt_Parallel, @@ -137,23 +86,11 @@ module CmdLineOpts ( opt_NoImplicitPrelude, opt_OmitBlackHoling, opt_OmitInterfacePragmas, - opt_ProduceExportCStubs, - opt_ProduceExportHStubs, opt_NoPruneTyDecls, opt_NoPruneDecls, - opt_ReportCompile, opt_Static, opt_Unregisterised, - opt_Verbose, - - opt_OutputLanguage, - opt_OutputFile, - - -- Code generation - opt_UseVanillaRegs, - opt_UseFloatRegs, - opt_UseDoubleRegs, - opt_UseLongRegs + opt_Verbose ) where #include "HsVersions.h" @@ -162,6 +99,8 @@ import Array ( array, (//) ) import GlaExts import Argv import Constants -- Default values for some flags +import Util +import FastTypes import Maybes ( firstJust ) import Panic ( panic ) @@ -188,14 +127,11 @@ Static flags are represented by top-level values of type Bool or Int, for example. They therefore have the same value throughout the invocation of hsc. -Dynamic flags are represented by a function: - - checkDynFlag :: DynFlag -> SwitchResult - -which is passed into hsc by the compilation manager for every -compilation. Dynamic flags are those that change on a per-compilation -basis, perhaps because they may be present in the OPTIONS pragma at -the top of a module. +Dynamic flags are represented by an abstract type, DynFlags, which is +passed into hsc by the compilation manager for every compilation. +Dynamic flags are those that change on a per-compilation basis, +perhaps because they may be present in the OPTIONS pragma at the top +of a module. Other flag-related blurb: @@ -240,9 +176,11 @@ data CoreToDo -- These are diff core-to-core passes, | CoreDoWorkerWrapper | CoreDoSpecialising | CoreDoUSPInf - | CoreDoCPResult + | CoreDoCPResult | CoreDoGlomBinds | CoreCSE + + | CoreDoNothing -- useful when building up lists of these things \end{code} \begin{code} @@ -313,69 +251,59 @@ data DynFlag | Opt_DoStgLinting | Opt_DoUSPLinting + | Opt_WarnDuplicateExports + | Opt_WarnHiShadows + | Opt_WarnIncompletePatterns + | Opt_WarnMissingFields + | Opt_WarnMissingMethods + | Opt_WarnMissingSigs + | Opt_WarnNameShadowing + | Opt_WarnOverlappingPatterns + | Opt_WarnSimplePatterns + | Opt_WarnTypeDefaults + | Opt_WarnUnusedBinds + | Opt_WarnUnusedImports + | Opt_WarnUnusedMatches + | Opt_WarnDeprecations + -- language opts | Opt_AllowOverlappingInstances | Opt_AllowUndecidableInstances | Opt_GlasgowExts + | Opt_Generics + + -- misc + | Opt_ReportCompile deriving (Eq) -newtype DynFlags = DynFlags (CoreToDo, StgToDo, [(DynFlag, SwitchResult)]) - -boolOpt :: DynFlag -> DynFlags -> Bool -boolOpt f (DynFlags (_, _, dflags)) - = case lookup f dflags of - Nothing -> False - Just (SwBool b) -> b - _ -> panic "boolOpt" - -dopt_D_dump_all = boolOpt Opt_D_dump_all -dopt_D_dump_most = boolOpt Opt_D_dump_most -dopt_D_dump_absC = boolOpt Opt_D_dump_absC -dopt_D_dump_asm = boolOpt Opt_D_dump_asm -dopt_D_dump_cpranal = boolOpt Opt_D_dump_cpranal -dopt_D_dump_deriv = boolOpt Opt_D_dump_deriv -dopt_D_dump_ds = boolOpt Opt_D_dump_ds -dopt_D_dump_flatC = boolOpt Opt_D_dump_flatC -dopt_D_dump_foreign = boolOpt Opt_D_dump_foreign -dopt_D_dump_inlinings = boolOpt Opt_D_dump_inlinings -dopt_D_dump_occur_anal = boolOpt Opt_D_dump_occur_anal -dopt_D_dump_parsed = boolOpt Opt_D_dump_parsed -dopt_D_dump_realC = boolOpt Opt_D_dump_realC -dopt_D_dump_rn = boolOpt Opt_D_dump_rn -dopt_D_dump_simpl = boolOpt Opt_D_dump_simpl -dopt_D_dump_simpl_iterations = boolOpt Opt_D_dump_simpl_iterations -dopt_D_dump_spec = boolOpt Opt_D_dump_spec -dopt_D_dump_stg = boolOpt Opt_D_dump_stg -dopt_D_dump_stranal = boolOpt Opt_D_dump_stranal -dopt_D_dump_tc = boolOpt Opt_D_dump_tc -dopt_D_dump_types = boolOpt Opt_D_dump_types -dopt_D_dump_rules = boolOpt Opt_D_dump_rules -dopt_D_dump_usagesp = boolOpt Opt_D_dump_usagesp -dopt_D_dump_cse = boolOpt Opt_D_dump_cse -dopt_D_dump_worker_wrapper = boolOpt Opt_D_dump_worker_wrapper -dopt_D_show_passes = boolOpt Opt_D_show_passes -dopt_D_dump_rn_trace = boolOpt Opt_D_dump_rn_trace -dopt_D_dump_rn_stats = boolOpt Opt_D_dump_rn_stats -dopt_D_dump_stix = boolOpt Opt_D_dump_stix -dopt_D_dump_simpl_stats = boolOpt Opt_D_dump_simpl_stats -dopt_D_source_stats = boolOpt Opt_D_source_stats -dopt_D_verbose_core2core = boolOpt Opt_D_verbose_core2core -dopt_D_verbose_stg2stg = boolOpt Opt_D_verbose_stg2stg -dopt_D_dump_hi_diffs = boolOpt Opt_D_dump_hi_diffs -dopt_D_dump_minimal_imports = boolOpt Opt_D_dump_minimal_imports -dopt_DoCoreLinting = boolOpt Opt_DoCoreLinting -dopt_DoStgLinting = boolOpt Opt_DoStgLinting -dopt_DoUSPLinting = boolOpt Opt_DoUSPLinting - -dopt_AllowOverlappingInstances = boolOpt Opt_AllowOverlappingInstances -dopt_AllowUndecidableInstances = boolOpt Opt_AllowUndecidableInstances -dopt_GlasgowExts = boolOpt Opt_GlasgowExts +data DynFlags = DynFlags { + coreToDo :: CoreToDo, + stgToDo :: StgToDo, + hscLang :: HscLang, + hscOutName :: String, -- name of the file in which to place output + flags :: [DynFlag] + } + +dopt :: DynFlag -> DynFlags -> Bool +dopt f dflags = f `elem` (flags dflags) dopt_CoreToDo :: DynFlags -> CoreToDo -dopt_CoreToDo (DynFlags (core_todo,_,_)) = core_todo +dopt_CoreToDo = coreToDo dopt_StgToDo :: DynFlags -> StgToDo -dopt_StgToDo (DynFlags (_,stg_todo,_)) = stg_todo +dopt_StgToDo = stgToDo + +dopt_OutName :: DynFlags -> String +dopt_OutName = hscOutName + +data HscLang + = HscC + | HscAsm + | HscJava + | HscInterpreter + +dopt_HscLang :: DynFlags -> HscLang +dopt_HscLang = hscLang \end{code} %************************************************************************ @@ -442,22 +370,6 @@ opt_PprStyle_NoPrags = lookUp SLIT("-dppr-noprags") opt_PprStyle_Debug = lookUp SLIT("-dppr-debug") opt_PprUserLength = lookup_def_int "-dppr-user-length" 5 --ToDo: give this a name --- warning opts -opt_WarnDuplicateExports = lookUp SLIT("-fwarn-duplicate-exports") -opt_WarnHiShadows = lookUp SLIT("-fwarn-hi-shadowing") -opt_WarnIncompletePatterns = lookUp SLIT("-fwarn-incomplete-patterns") -opt_WarnMissingFields = lookUp SLIT("-fwarn-missing-fields") -opt_WarnMissingMethods = lookUp SLIT("-fwarn-missing-methods") -opt_WarnMissingSigs = lookUp SLIT("-fwarn-missing-signatures") -opt_WarnNameShadowing = lookUp SLIT("-fwarn-name-shadowing") -opt_WarnOverlappingPatterns = lookUp SLIT("-fwarn-overlapping-patterns") -opt_WarnSimplePatterns = lookUp SLIT("-fwarn-simple-patterns") -opt_WarnTypeDefaults = lookUp SLIT("-fwarn-type-defaults") -opt_WarnUnusedBinds = lookUp SLIT("-fwarn-unused-binds") -opt_WarnUnusedImports = lookUp SLIT("-fwarn-unused-imports") -opt_WarnUnusedMatches = lookUp SLIT("-fwarn-unused-matches") -opt_WarnDeprecations = lookUp SLIT("-fwarn-deprecations") - -- profiling opts opt_AutoSccsOnAllToplevs = lookUp SLIT("-fauto-sccs-on-all-toplevs") opt_AutoSccsOnExportedToplevs = lookUp SLIT("-fauto-sccs-on-exported-toplevs") @@ -469,7 +381,6 @@ opt_DoTickyProfiling = lookUp SLIT("-fticky-ticky") -- language opts opt_AllStrict = lookUp SLIT("-fall-strict") opt_DictsStrict = lookUp SLIT("-fdicts-strict") -opt_Generics = lookUp SLIT("-fgenerics") opt_IrrefutableTuples = lookUp SLIT("-firrefutable-tuples") opt_MaxContextReductionDepth = lookup_def_int "-fcontext-stack" mAX_CONTEXT_REDUCTION_DEPTH opt_NumbersStrict = lookUp SLIT("-fnumbers-strict") @@ -486,7 +397,7 @@ opt_UsageSPOn = lookUp SLIT("-fusagesp-on") opt_UnboxStrictFields = lookUp SLIT("-funbox-strict-fields") {- - The optional '-inpackage=P' flag tells what package + The optional '-inpackage=P' flag tells what package we are compiling this module for. The Prelude, for example is compiled with '-package prelude' -} @@ -505,18 +416,6 @@ opt_NoHiCheck = lookUp SLIT("-fno-hi-version-check") opt_NoImplicitPrelude = lookUp SLIT("-fno-implicit-prelude") opt_OmitBlackHoling = lookUp SLIT("-dno-black-holing") opt_OmitInterfacePragmas = lookUp SLIT("-fomit-interface-pragmas") -opt_ProduceExportCStubs = lookup_str "-F=" -opt_ProduceExportHStubs = lookup_str "-FH=" - --- Language for output: "C", "asm", "java", maybe more --- Nothing => don't output anything -opt_OutputLanguage :: Maybe String -opt_OutputLanguage = lookup_str "-olang=" - -opt_OutputFile :: String -opt_OutputFile = case lookup_str "-ofile=" of - Nothing -> panic "No output file specified (-ofile=xxx)" - Just f -> f -- Simplifier switches opt_SimplNoPreInlining = lookUp SLIT("-fno-pre-inlining") @@ -540,113 +439,75 @@ opt_UF_UpdateInPlace = lookUp SLIT("-funfolding-update-in-place") opt_UF_CheapOp = ( 1 :: Int) -- Only one instruction; and the args are charged for opt_UF_DearOp = ( 4 :: Int) -opt_ReportCompile = lookUp SLIT("-freport-compile") opt_NoPruneDecls = lookUp SLIT("-fno-prune-decls") opt_NoPruneTyDecls = lookUp SLIT("-fno-prune-tydecls") opt_Static = lookUp SLIT("-static") opt_Unregisterised = lookUp SLIT("-funregisterised") opt_Verbose = lookUp SLIT("-v") - -opt_UseVanillaRegs | opt_Unregisterised = 0 - | otherwise = mAX_Real_Vanilla_REG -opt_UseFloatRegs | opt_Unregisterised = 0 - | otherwise = mAX_Real_Float_REG -opt_UseDoubleRegs | opt_Unregisterised = 0 - | otherwise = mAX_Real_Double_REG -opt_UseLongRegs | opt_Unregisterised = 0 - | otherwise = mAX_Real_Long_REG \end{code} -\begin{code} -classifyOpts :: ([CoreToDo], -- Core-to-Core processing spec - [StgToDo]) -- STG-to-STG processing spec - -classifyOpts = sep argv [] [] -- accumulators... - where - sep :: [FAST_STRING] -- cmd-line opts (input) - -> [CoreToDo] -> [StgToDo] -- to_do accumulators - -> ([CoreToDo], [StgToDo]) -- result - - sep [] core_td stg_td -- all done! - = (reverse core_td, reverse stg_td) - -# define CORE_TD(to_do) sep opts (to_do:core_td) stg_td -# define STG_TD(to_do) sep opts core_td (to_do:stg_td) - - sep (opt1:opts) core_td stg_td - = case (_UNPK_ opt1) of -- the non-"just match a string" options are at the end... - ',' : _ -> sep opts core_td stg_td -- it is for the parser - - "-fsimplify" -> -- gather up SimplifierSwitches specially... - simpl_sep opts defaultSimplSwitches core_td stg_td - - "-ffloat-inwards" -> CORE_TD(CoreDoFloatInwards) - "-ffloat-outwards" -> CORE_TD(CoreDoFloatOutwards False) - "-ffloat-outwards-full" -> CORE_TD(CoreDoFloatOutwards True) - "-fliberate-case" -> CORE_TD(CoreLiberateCase) - "-fcse" -> CORE_TD(CoreCSE) - "-fglom-binds" -> CORE_TD(CoreDoGlomBinds) - "-fprint-core" -> CORE_TD(CoreDoPrintCore) - "-fstatic-args" -> CORE_TD(CoreDoStaticArgs) - "-fstrictness" -> CORE_TD(CoreDoStrictness) - "-fworker-wrapper" -> CORE_TD(CoreDoWorkerWrapper) - "-fspecialise" -> CORE_TD(CoreDoSpecialising) - "-fusagesp" -> CORE_TD(CoreDoUSPInf) - "-fcpr-analyse" -> CORE_TD(CoreDoCPResult) - - "-fstg-static-args" -> STG_TD(StgDoStaticArgs) - "-dstg-stats" -> STG_TD(D_stg_stats) - "-flambda-lift" -> STG_TD(StgDoLambdaLift) - "-fmassage-stg-for-profiling" -> STG_TD(StgDoMassageForProfiling) - - _ -> -- NB: the driver is really supposed to handle bad options - sep opts core_td stg_td - - ---------------- - - simpl_sep :: [FAST_STRING] -- cmd-line opts (input) - -> [SimplifierSwitch] -- simplifier-switch accumulator - -> [CoreToDo] -> [StgToDo] -- to_do accumulators - -> ([CoreToDo], [StgToDo]) -- result - - -- "simpl_sep" tailcalls "sep" once it's seen one set - -- of SimplifierSwitches for a CoreDoSimplify. - -#ifdef DEBUG - simpl_sep input@[] simpl_sw core_td stg_td - = panic "simpl_sep []" -#endif +%************************************************************************ +%* * +\subsection{List of static hsc flags} +%* * +%************************************************************************ - -- The SimplifierSwitches should be delimited by "[" and "]". - - simpl_sep (opt1:opts) simpl_sw core_td stg_td - = case (_UNPK_ opt1) of - "[" -> simpl_sep opts simpl_sw core_td stg_td - "]" -> let - this_simpl = CoreDoSimplify (isAmongSimpl simpl_sw) - in - sep opts (this_simpl : core_td) stg_td - - opt -> case matchSimplSw opt of - Just sw -> simpl_sep opts (sw:simpl_sw) core_td stg_td - Nothing -> simpl_sep opts simpl_sw core_td stg_td - -matchSimplSw opt - = firstJust [ matchSwInt opt "-fmax-simplifier-iterations" MaxSimplifierIterations - , matchSwInt opt "-finline-phase" SimplInlinePhase - , matchSwBool opt "-fno-rules" DontApplyRules - , matchSwBool opt "-fno-case-of-case" NoCaseOfCase - , matchSwBool opt "-flet-to-case" SimplLetToCase - ] - -matchSwBool :: String -> String -> a -> Maybe a -matchSwBool opt str sw | opt == str = Just sw - | otherwise = Nothing - -matchSwInt :: String -> String -> (Int -> a) -> Maybe a -matchSwInt opt str sw = case startsWith str opt of - Just opt_left -> Just (sw (read opt_left)) - Nothing -> Nothing +\begin{code} +isStaticHscFlag f = + f `elem` [ + "-fauto-sccs-on-all-toplevs", + "-fauto-sccs-on-exported-toplevs", + "-fauto-sccs-on-individual-cafs", + "-fauto-sccs-on-dicts", + "-fscc-profiling", + "-fticky-ticky", + "-fall-strict", + "-fdicts-strict", + "-fgenerics", + "-firrefutable-tuples", + "-fnumbers-strict", + "-fparallel", + "-fsmp", + "-fsemi-tagging", + "-ffoldr-build-on", + "-flet-no-escape", + "-funfold-casms-in-hi-file", + "-fusagesp-on", + "-funbox-strict-fields", + "-femit-extern-decls", + "-fglobalise-toplev-names", + "-fgransim", + "-fignore-asserts", + "-fignore-interface-pragmas", + "-fno-hi-version-check", + "-fno-implicit-prelude", + "-dno-black-holing", + "-fomit-interface-pragmas", + "-fno-pre-inlining", + "-fdo-eta-reduction", + "-fdo-lambda-eta-expansion", + "-fcase-of-case", + "-fcase-merge", + "-fpedantic-bottoms", + "-fexcess-precision", + "-funfolding-update-in-place", + "-freport-compile", + "-fno-prune-decls", + "-fno-prune-tydecls", + "-static", + "-funregisterised", + "-v" ] + || any (flip prefixMatch f) [ + "-fcontext-stack", + "-fliberate-case-threshold", + "-fhi-version=", + "-fhistory-size", + "-funfolding-interface-threshold", + "-funfolding-creation-threshold", + "-funfolding-use-threshold", + "-funfolding-fun-discount", + "-funfolding-keeness-factor" + ] \end{code} %************************************************************************ @@ -655,23 +516,22 @@ matchSwInt opt str sw = case startsWith str opt of %* * %************************************************************************ -In spite of the @Produce*@ constructor, these things behave just like -enumeration types. +These things behave just like enumeration types. \begin{code} instance Eq SimplifierSwitch where - a == b = tagOf_SimplSwitch a _EQ_ tagOf_SimplSwitch b + a == b = tagOf_SimplSwitch a ==# tagOf_SimplSwitch b instance Ord SimplifierSwitch where - a < b = tagOf_SimplSwitch a _LT_ tagOf_SimplSwitch b - a <= b = tagOf_SimplSwitch a _LE_ tagOf_SimplSwitch b + a < b = tagOf_SimplSwitch a <# tagOf_SimplSwitch b + a <= b = tagOf_SimplSwitch a <=# tagOf_SimplSwitch b -tagOf_SimplSwitch (SimplInlinePhase _) = ILIT(1) -tagOf_SimplSwitch (MaxSimplifierIterations _) = ILIT(2) -tagOf_SimplSwitch DontApplyRules = ILIT(3) -tagOf_SimplSwitch SimplLetToCase = ILIT(4) -tagOf_SimplSwitch NoCaseOfCase = ILIT(5) +tagOf_SimplSwitch (SimplInlinePhase _) = _ILIT(1) +tagOf_SimplSwitch (MaxSimplifierIterations _) = _ILIT(2) +tagOf_SimplSwitch DontApplyRules = _ILIT(3) +tagOf_SimplSwitch SimplLetToCase = _ILIT(4) +tagOf_SimplSwitch NoCaseOfCase = _ILIT(5) -- If you add anything here, be sure to change lAST_SIMPL_SWITCH_TAG, too! @@ -686,7 +546,6 @@ lAST_SIMPL_SWITCH_TAG = 5 \begin{code} isAmongSimpl :: [SimplifierSwitch] -> SimplifierSwitch -> SwitchResult - isAmongSimpl on_switches -- Switches mentioned later occur *earlier* -- in the list; defaults right at the end. = let @@ -720,9 +579,12 @@ isAmongSimpl on_switches -- Switches mentioned later occur *earlier* #endif } where - mk_assoc_elem k@(MaxSimplifierIterations lvl) = (IBOX(tagOf_SimplSwitch k), SwInt lvl) - mk_assoc_elem k@(SimplInlinePhase n) = (IBOX(tagOf_SimplSwitch k), SwInt n) - mk_assoc_elem k = (IBOX(tagOf_SimplSwitch k), SwBool True) -- I'm here, Mom! + mk_assoc_elem k@(MaxSimplifierIterations lvl) + = (iBox (tagOf_SimplSwitch k), SwInt lvl) + mk_assoc_elem k@(SimplInlinePhase n) + = (iBox (tagOf_SimplSwitch k), SwInt n) + mk_assoc_elem k + = (iBox (tagOf_SimplSwitch k), SwBool True) -- I'm here, Mom! -- cannot have duplicates if we are going to use the array thing rm_dups switches_so_far switch @@ -731,7 +593,7 @@ isAmongSimpl on_switches -- Switches mentioned later occur *earlier* else switch : switches_so_far where sw `is_elem` [] = False - sw `is_elem` (s:ss) = (tagOf_SimplSwitch sw) _EQ_ (tagOf_SimplSwitch s) + sw `is_elem` (s:ss) = (tagOf_SimplSwitch sw) ==# (tagOf_SimplSwitch s) || sw `is_elem` ss \end{code}