%
-% (c) The GRASP/AQUA Project, Glasgow University, 1992-1996
+% (c) The GRASP/AQUA Project, Glasgow University, 1992-1998
%
\section[PrelInfo]{The @PrelInfo@ interface to the compiler's prelude knowledge}
\begin{code}
module PrelInfo (
- -- finite maps for built-in things (for the renamer and typechecker):
- builtinNames, derivingOccurrences,
- BuiltinNames,
+ builtinNames, -- Names of things whose *unique* must be known, but
+ -- that is all. If something is in here, you know that
+ -- if it's used at all then it's Name will be just as
+ -- it is here, unique and all. Includes all the
+ -- wiredd-in names.
+
+ thinAirIdNames, -- Names of non-wired-in Ids that may be used out of
+ setThinAirIds, -- thin air in any compilation. If they are not wired in
+ thinAirModules, -- we must be sure to import them from some Prelude
+ -- interface file even if they are not overtly
+ -- mentioned. Subset of builtinNames.
+ noRepIntegerIds,
+ noRepStrIds,
+
+ derivingOccurrences, -- For a given class C, this tells what other
+ -- things are needed as a result of a
+ -- deriving(C) clause
+
+
+ -- Here are the thin-air Ids themselves
+ int2IntegerId, addr2IntegerId,
+ integerMinusOneId, integerZeroId, integerPlusOneId, integerPlusTwoId,
+ packStringForCId, unpackCStringId, unpackCString2Id,
+ unpackCStringAppendId, unpackCStringFoldrId,
+ foldrId,
+
+ -- Random other things
+ main_NAME, ioTyCon_NAME,
+ deRefStablePtr_NAME, makeStablePtr_NAME,
+ bindIO_NAME,
maybeCharLikeCon, maybeIntLikeCon,
+ needsDataDeclCtxtClassKeys, cCallishClassKeys, cCallishTyKeys,
+ isNoDictClass, isNumericClass, isStandardClass, isCcallishClass,
+ isCreturnableClass, numericTyKeys,
+ -- RdrNames for lots of things, mainly used in derivings
eq_RDR, ne_RDR, le_RDR, lt_RDR, ge_RDR, gt_RDR, max_RDR, min_RDR,
compare_RDR, minBound_RDR, maxBound_RDR, enumFrom_RDR, enumFromTo_RDR,
enumFromThen_RDR, enumFromThenTo_RDR, fromEnum_RDR, toEnum_RDR,
numClass_RDR, fractionalClass_RDR, eqClass_RDR,
ccallableClass_RDR, creturnableClass_RDR,
- monadZeroClass_RDR, enumClass_RDR, evalClass_RDR, ordClass_RDR,
- ioDataCon_RDR, ioOkDataCon_RDR,
+ monadZeroClass_RDR, enumClass_RDR, ordClass_RDR,
+ ioDataCon_RDR
- main_NAME, allClass_NAME, ioTyCon_NAME, ioOkDataCon_NAME,
-
- needsDataDeclCtxtClassKeys, cCallishClassKeys, cCallishTyKeys, isNoDictClass,
- isNumericClass, isStandardClass, isCcallishClass, isCreturnableClass
) where
#include "HsVersions.h"
-import IdUtils ( primOpName )
-- friends:
import PrelMods -- Prelude module names
import PrelVals -- VALUES
+import MkId ( mkPrimitiveId )
import PrimOp ( PrimOp(..), allThePrimOps )
+import DataCon ( DataCon )
import PrimRep ( PrimRep(..) )
import TysPrim -- TYPES
import TysWiredIn
-- others:
import RdrHsSyn ( RdrName(..), varQual, tcQual, qual )
import BasicTypes ( IfaceFlavour )
-import Id ( GenId, Id )
+import Var ( varUnique, Id )
import Name ( Name, OccName(..), Provenance(..),
getName, mkGlobalName, modAndOcc
)
import Class ( Class, classKey )
-import TyCon ( tyConDataCons, mkFunTyCon, TyCon )
-import Type
+import TyCon ( tyConDataCons, TyCon )
+import Type ( funTyCon )
import Bag
import Unique -- *Key stuff
-import UniqFM ( UniqFM, listToUFM )
-import Util ( isIn )
+import UniqFM ( UniqFM, listToUFM, lookupWithDefaultUFM )
+import Util ( isIn, panic )
+
+import IOExts
\end{code}
%************************************************************************
@Classes@, the other to look up values.
\begin{code}
-type BuiltinNames = Bag Name
-
-builtinNames :: BuiltinNames
+builtinNames :: Bag Name
builtinNames
- = -- Wired in TyCons
- unionManyBags (map getTyConNames wired_in_tycons) `unionBags`
+ = unionManyBags
+ [ -- Wired in TyCons
+ unionManyBags (map getTyConNames wired_in_tycons)
+
+ -- Wired in Ids
+ , listToBag (map getName wired_in_ids)
- -- Wired in Ids
- listToBag (map getName wired_in_ids) `unionBags`
+ -- PrimOps
+ , listToBag (map (getName . mkPrimitiveId) allThePrimOps)
- -- PrimOps
- listToBag (map (getName.primOpName) allThePrimOps) `unionBags`
+ -- Thin-air ids
+ , listToBag thinAirIdNames
- -- Other names with magic keys
- listToBag knownKeyNames
+ -- Other names with magic keys
+ , listToBag knownKeyNames
+ ]
\end{code}
\begin{code}
getTyConNames :: TyCon -> Bag Name
getTyConNames tycon
- = getName tycon `consBag` listToBag (map getName (tyConDataCons tycon))
+ = getName tycon `consBag`
+ listToBag (map getName (tyConDataCons tycon))
-- Synonyms return empty list of constructors
\end{code}
-
We let a lot of "non-standard" values be visible, so that we can make
sense of them in interface pragmas. It's cool, though they all have
"non-standard" names, so they won't get past the parser in user code.
+
%************************************************************************
%* *
\subsection{Wired in TyCons}
%* *
%************************************************************************
-
\begin{code}
-wired_in_tycons = [mkFunTyCon] ++
+wired_in_tycons = [funTyCon] ++
prim_tycons ++
tuple_tycons ++
+ unboxed_tuple_tycons ++
data_tycons
prim_tycons
, intPrimTyCon
, int64PrimTyCon
, foreignObjPrimTyCon
+ , weakPrimTyCon
, mutableArrayPrimTyCon
, mutableByteArrayPrimTyCon
- , synchVarPrimTyCon
+ , mVarPrimTyCon
+ , mutVarPrimTyCon
, realWorldTyCon
, stablePtrPrimTyCon
, statePrimTyCon
+ , threadIdPrimTyCon
, wordPrimTyCon
, word64PrimTyCon
]
tuple_tycons = unitTyCon : [tupleTyCon i | i <- [2..37] ]
-
+unboxed_tuple_tycons = [unboxedTupleTyCon i | i <- [1..37] ]
data_tycons
- = [ listTyCon
- , addrTyCon
+ = [ addrTyCon
, boolTyCon
, charTyCon
, doubleTyCon
, floatTyCon
- , foreignObjTyCon
, intTyCon
, int8TyCon
, int16TyCon
, int32TyCon
, int64TyCon
, integerTyCon
- , liftTyCon
- , return2GMPsTyCon
- , returnIntAndGMPTyCon
- , stTyCon
- , stRetTyCon
- , stablePtrTyCon
- , stateAndAddrPrimTyCon
- , stateAndArrayPrimTyCon
- , stateAndByteArrayPrimTyCon
- , stateAndCharPrimTyCon
- , stateAndDoublePrimTyCon
- , stateAndFloatPrimTyCon
- , stateAndForeignObjPrimTyCon
- , stateAndIntPrimTyCon
- , stateAndMutableArrayPrimTyCon
- , stateAndMutableByteArrayPrimTyCon
- , stateAndPtrPrimTyCon
- , stateAndStablePtrPrimTyCon
- , stateAndSynchVarPrimTyCon
- , stateAndWordPrimTyCon
+ , listTyCon
, voidTyCon
, wordTyCon
, word8TyCon
]
\end{code}
+
%************************************************************************
%* *
\subsection{Wired in Ids}
%* *
%************************************************************************
-The WiredIn Ids ...
-ToDo: Some of these should be moved to id_keys_infos!
-
\begin{code}
wired_in_ids
- = [ aBSENT_ERROR_ID
- , augmentId
- , buildId
+ = [ -- These error-y things are wired in because we don't yet have
+ -- a way to express in an inteface file that the result type variable
+ -- is 'open'; that is can be unified with an unboxed type
+ aBSENT_ERROR_ID
, eRROR_ID
- , foldlId
- , foldrId
, iRREFUT_PAT_ERROR_ID
- , integerMinusOneId
- , integerPlusOneId
- , integerPlusTwoId
- , integerZeroId
, nON_EXHAUSTIVE_GUARDS_ERROR_ID
, nO_METHOD_BINDING_ERROR_ID
, pAR_ERROR_ID
, pAT_ERROR_ID
- , packStringForCId
, rEC_CON_ERROR_ID
, rEC_UPD_ERROR_ID
+
+ -- These two can't be defined in Haskell
, realWorldPrimId
--- , tRACE_ID
- , unpackCString2Id
- , unpackCStringAppendId
- , unpackCStringFoldrId
- , unpackCStringId
, unsafeCoerceId
- , voidId
-
--- , copyableId
--- , forkId
--- , noFollowId
--- , parAtAbsId
--- , parAtForNowId
--- , parAtId
--- , parAtRelId
--- , parGlobalId
--- , parId
--- , parLocalId
--- , seqId
]
+
+\end{code}
+
+%************************************************************************
+%* *
+\subsection{Thin air entities}
+%* *
+%************************************************************************
+
+These are Ids that we need to reference in various parts of the
+system, and we'd like to pull them out of thin air rather than pass
+them around. We'd also like to have all the IdInfo available for each
+one: i.e. everything that gets pulled out of the interface file.
+
+The solution is to generate this map of global Ids after the
+typechecker, and assign it to a global variable. Any subsequent
+pass may refer to the map to pull Ids out. Any invalid
+(i.e. pre-typechecker) access to the map will result in a panic.
+
+\begin{code}
+thinAirIdNames
+ = map mkKnownKeyGlobal
+ [
+ -- Needed for converting literals to Integers (used in tidyCoreExpr)
+ (varQual (pREL_BASE, SLIT("int2Integer")), int2IntegerIdKey)
+ , (varQual (pREL_BASE, SLIT("addr2Integer")), addr2IntegerIdKey)
+
+ -- OK, this is Will's idea: we should have magic values for Integers 0,
+ -- +1, +2, and -1 (go ahead, fire me):
+ , (varQual (pREL_BASE, SLIT("integer_0")), integerZeroIdKey)
+ , (varQual (pREL_BASE, SLIT("integer_1")), integerPlusOneIdKey)
+ , (varQual (pREL_BASE, SLIT("integer_2")), integerPlusTwoIdKey)
+ , (varQual (pREL_BASE, SLIT("integer_m1")), integerMinusOneIdKey)
+
+
+ -- String literals
+ , (varQual (pREL_PACK, SLIT("packCString#")), packCStringIdKey)
+ , (varQual (pREL_PACK, SLIT("unpackCString#")), unpackCStringIdKey)
+ , (varQual (pREL_PACK, SLIT("unpackNBytes#")), unpackCString2IdKey)
+ , (varQual (pREL_PACK, SLIT("unpackAppendCString#")), unpackCStringAppendIdKey)
+ , (varQual (pREL_PACK, SLIT("unpackFoldrCString#")), unpackCStringFoldrIdKey)
+
+ -- Folds; introduced by desugaring list comprehensions
+ , (varQual (pREL_BASE, SLIT("foldr")), foldrIdKey)
+ ]
+
+thinAirModules = [pREL_PACK] -- See notes with RnIfaces.findAndReadIface
+
+noRepIntegerIds = [integerZeroId, integerPlusOneId, integerPlusTwoId, integerMinusOneId,
+ int2IntegerId, addr2IntegerId]
+
+noRepStrIds = [unpackCString2Id, unpackCStringId]
+
+int2IntegerId = lookupThinAirId int2IntegerIdKey
+addr2IntegerId = lookupThinAirId addr2IntegerIdKey
+
+integerMinusOneId = lookupThinAirId integerMinusOneIdKey
+integerZeroId = lookupThinAirId integerZeroIdKey
+integerPlusOneId = lookupThinAirId integerPlusOneIdKey
+integerPlusTwoId = lookupThinAirId integerPlusTwoIdKey
+
+packStringForCId = lookupThinAirId packCStringIdKey
+unpackCStringId = lookupThinAirId unpackCStringIdKey
+unpackCString2Id = lookupThinAirId unpackCString2IdKey
+unpackCStringAppendId = lookupThinAirId unpackCStringAppendIdKey
+unpackCStringFoldrId = lookupThinAirId unpackCStringFoldrIdKey
+
+foldrId = lookupThinAirId foldrIdKey
+\end{code}
+
+
+\begin{code}
+\end{code}
+
+\begin{code}
+thinAirIdMapRef :: IORef (UniqFM Id)
+thinAirIdMapRef = unsafePerformIO (newIORef (panic "thinAirIdMap: still empty"))
+
+setThinAirIds :: [Id] -> IO ()
+setThinAirIds thin_air_ids
+ = writeIORef thinAirIdMapRef the_map
+ where
+ the_map = listToUFM [(varUnique id, id) | id <- thin_air_ids]
+
+thinAirIdMap :: UniqFM Id
+thinAirIdMap = unsafePerformIO (readIORef thinAirIdMapRef)
+ -- Read it just once, the first time someone tugs on thinAirIdMap
+
+lookupThinAirId :: Unique -> Id
+lookupThinAirId uniq = lookupWithDefaultUFM thinAirIdMap
+ (panic "lookupThinAirId: no mapping") uniq
\end{code}
mkKnownKeyGlobal (Qual mod occ hif, uniq)
= mkGlobalName uniq mod occ NoProvenance
-allClass_NAME = mkKnownKeyGlobal (allClass_RDR, allClassKey)
-ioTyCon_NAME = mkKnownKeyGlobal (ioTyCon_RDR, ioTyConKey)
-ioOkDataCon_NAME = mkKnownKeyGlobal (ioOkDataCon_RDR, ioOkDataConKey)
-main_NAME = mkKnownKeyGlobal (main_RDR, mainKey)
+ioTyCon_NAME = mkKnownKeyGlobal (ioTyCon_RDR, ioTyConKey)
+main_NAME = mkKnownKeyGlobal (main_RDR, mainKey)
+
+ -- Operations needed when compiling FFI decls
+bindIO_NAME = mkKnownKeyGlobal (bindIO_RDR, bindIOIdKey)
+deRefStablePtr_NAME = mkKnownKeyGlobal (deRefStablePtr_RDR, deRefStablePtrIdKey)
+makeStablePtr_NAME = mkKnownKeyGlobal (makeStablePtr_RDR, makeStablePtrIdKey)
knownKeyNames :: [Name]
knownKeyNames
- = [main_NAME, allClass_NAME, ioTyCon_NAME, ioOkDataCon_NAME]
+ = [main_NAME, ioTyCon_NAME]
++
map mkKnownKeyGlobal
[
-- Type constructors (synonyms especially)
- (orderingTyCon_RDR, orderingTyConKey)
- , (rationalTyCon_RDR, rationalTyConKey)
- , (ratioDataCon_RDR, ratioDataConKey)
- , (ratioTyCon_RDR, ratioTyConKey)
- , (byteArrayTyCon_RDR, byteArrayTyConKey)
+ (orderingTyCon_RDR, orderingTyConKey)
+ , (rationalTyCon_RDR, rationalTyConKey)
+ , (ratioDataCon_RDR, ratioDataConKey)
+ , (ratioTyCon_RDR, ratioTyConKey)
+ , (byteArrayTyCon_RDR, byteArrayTyConKey)
, (mutableByteArrayTyCon_RDR, mutableByteArrayTyConKey)
-
+ , (foreignObjTyCon_RDR, foreignObjTyConKey)
+ , (stablePtrTyCon_RDR, stablePtrTyConKey)
-- Classes. *Must* include:
-- classes that are grabbed by key (e.g., eqClassKey)
-- classes in "Class.standardClassKeys" (quite a few)
, (eqClass_RDR, eqClassKey) -- mentioned, derivable
, (ordClass_RDR, ordClassKey) -- derivable
- , (evalClass_RDR, evalClassKey) -- mentioned
, (boundedClass_RDR, boundedClassKey) -- derivable
, (numClass_RDR, numClassKey) -- mentioned, numeric
, (enumClass_RDR, enumClassKey) -- derivable
, (returnM_RDR, returnMClassOpKey)
, (zeroM_RDR, zeroClassOpKey)
, (fromRational_RDR, fromRationalClassOpKey)
+
+ , (deRefStablePtr_RDR, deRefStablePtrIdKey)
+ , (makeStablePtr_RDR, makeStablePtrIdKey)
+ , (bindIO_RDR, bindIOIdKey)
+
+ , (map_RDR, mapIdKey)
+ , (append_RDR, appendIdKey)
+
+ -- List operations
+ , (concat_RDR, concatIdKey)
+ , (filter_RDR, filterIdKey)
+ , (zip_RDR, zipIdKey)
-- Others
, (otherwiseId_RDR, otherwiseIdKey)
ToDo: make it do the ``like'' part properly (as in 0.26 and before).
\begin{code}
-maybeCharLikeCon, maybeIntLikeCon :: Id -> Bool
-maybeCharLikeCon con = uniqueOf con == charDataConKey
-maybeIntLikeCon con = uniqueOf con == intDataConKey
+maybeCharLikeCon, maybeIntLikeCon :: DataCon -> Bool
+maybeCharLikeCon con = getUnique con == charDataConKey
+maybeIntLikeCon con = getUnique con == intDataConKey
\end{code}
%************************************************************************
to write them all down in one place.
\begin{code}
-prelude_primop op = qual (modAndOcc (primOpName op))
+prelude_primop op = qual (modAndOcc (mkPrimitiveId op))
+
+main_RDR = varQual (mAIN, SLIT("main"))
+otherwiseId_RDR = varQual (pREL_BASE, SLIT("otherwise"))
intTyCon_RDR = qual (modAndOcc intTyCon)
-ioTyCon_RDR = tcQual (pREL_IO_BASE, SLIT("IO"))
-ioDataCon_RDR = varQual (pREL_IO_BASE, SLIT("IO"))
-ioOkDataCon_RDR = varQual (pREL_IO_BASE, SLIT("IOok"))
+ioTyCon_RDR = tcQual (pREL_IO_BASE, SLIT("IO"))
+ioDataCon_RDR = varQual (pREL_IO_BASE, SLIT("IO"))
+bindIO_RDR = varQual (pREL_IO_BASE, SLIT("bindIO"))
+
orderingTyCon_RDR = tcQual (pREL_BASE, SLIT("Ordering"))
rationalTyCon_RDR = tcQual (pREL_NUM, SLIT("Rational"))
ratioTyCon_RDR = tcQual (pREL_NUM, SLIT("Ratio"))
byteArrayTyCon_RDR = tcQual (pREL_ARR, SLIT("ByteArray"))
mutableByteArrayTyCon_RDR = tcQual (pREL_ARR, SLIT("MutableByteArray"))
-allClass_RDR = tcQual (pREL_GHC, SLIT("All"))
+foreignObjTyCon_RDR = tcQual (pREL_IO_BASE, SLIT("ForeignObj"))
+stablePtrTyCon_RDR = tcQual (pREL_FOREIGN, SLIT("StablePtr"))
+deRefStablePtr_RDR = varQual (pREL_FOREIGN, SLIT("deRefStablePtr"))
+makeStablePtr_RDR = varQual (pREL_FOREIGN, SLIT("makeStablePtr"))
+
eqClass_RDR = tcQual (pREL_BASE, SLIT("Eq"))
ordClass_RDR = tcQual (pREL_BASE, SLIT("Ord"))
-evalClass_RDR = tcQual (pREL_BASE, SLIT("Eval"))
boundedClass_RDR = tcQual (pREL_BASE, SLIT("Bounded"))
numClass_RDR = tcQual (pREL_BASE, SLIT("Num"))
enumClass_RDR = tcQual (pREL_BASE, SLIT("Enum"))
enumFromThen_RDR = varQual (pREL_BASE, SLIT("enumFromThen"))
enumFromThenTo_RDR = varQual (pREL_BASE, SLIT("enumFromThenTo"))
-thenM_RDR = varQual (pREL_BASE, SLIT(">>="))
-returnM_RDR = varQual (pREL_BASE, SLIT("return"))
-zeroM_RDR = varQual (pREL_BASE, SLIT("zero"))
-fromRational_RDR = varQual (pREL_NUM, SLIT("fromRational"))
+thenM_RDR = varQual (pREL_BASE, SLIT(">>="))
+returnM_RDR = varQual (pREL_BASE, SLIT("return"))
+zeroM_RDR = varQual (pREL_BASE, SLIT("zero"))
+fromRational_RDR = varQual (pREL_NUM, SLIT("fromRational"))
negate_RDR = varQual (pREL_BASE, SLIT("negate"))
eq_RDR = varQual (pREL_BASE, SLIT("=="))
ne_RDR = varQual (pREL_BASE, SLIT("/="))
compose_RDR = varQual (pREL_BASE, SLIT("."))
append_RDR = varQual (pREL_BASE, SLIT("++"))
map_RDR = varQual (pREL_BASE, SLIT("map"))
+concat_RDR = varQual (mONAD, SLIT("concat"))
+filter_RDR = varQual (mONAD, SLIT("filter"))
+zip_RDR = varQual (pREL_LIST, SLIT("zip"))
showList___RDR = varQual (pREL_BASE, SLIT("showList__"))
showsPrec_RDR = varQual (pREL_BASE, SLIT("showsPrec"))
error_RDR = varQual (pREL_ERR, SLIT("error"))
assert_RDR = varQual (pREL_GHC, SLIT("assert"))
-assertErr_RDR = varQual (pREL_ERR, SLIT("assertError"))
+assertErr_RDR = varQual (pREL_ERR, SLIT("assertError"))
eqH_Char_RDR = prelude_primop CharEqOp
ltH_Char_RDR = prelude_primop CharLtOp
geH_RDR = prelude_primop IntGeOp
leH_RDR = prelude_primop IntLeOp
minusH_RDR = prelude_primop IntSubOp
-
-main_RDR = varQual (mAIN, SLIT("main"))
-
-otherwiseId_RDR = varQual (pREL_BASE, SLIT("otherwise"))
\end{code}
%************************************************************************
-- EQ (from Ordering) is needed to force in the constructors
-- as well as the type constructor.
, (enumClassKey, [intTyCon_RDR, map_RDR])
- , (evalClassKey, [intTyCon_RDR])
, (boundedClassKey, [intTyCon_RDR])
, (showClassKey, [intTyCon_RDR, numClass_RDR, ordClass_RDR, compose_RDR, showString_RDR,
showParen_RDR, showSpace_RDR, showList___RDR])
isNoDictClass clas = classKey clas `is_elem` noDictClassKeys
is_elem = isIn "is_X_Class"
-numericClassKeys
- = [ numClassKey
- , realClassKey
- , integralClassKey
- , fractionalClassKey
- , floatingClassKey
- , realFracClassKey
- , realFloatClassKey
- ]
-
-needsDataDeclCtxtClassKeys -- see comments in TcDeriv
- = [ readClassKey
- ]
-
-cCallishClassKeys = [ cCallableClassKey, cReturnableClassKey ]
+numericClassKeys =
+ [ numClassKey
+ , realClassKey
+ , integralClassKey
+ , fractionalClassKey
+ , floatingClassKey
+ , realFracClassKey
+ , realFloatClassKey
+ ]
+
+ -- the strictness analyser needs to know about numeric types
+ -- (see SaAbsInt.lhs)
+numericTyKeys =
+ [ addrTyConKey
+ , wordTyConKey
+ , intTyConKey
+ , integerTyConKey
+ , doubleTyConKey
+ , floatTyConKey
+ ]
+
+needsDataDeclCtxtClassKeys = -- see comments in TcDeriv
+ [ readClassKey
+ ]
+
+cCallishClassKeys =
+ [ cCallableClassKey
+ , cReturnableClassKey
+ ]
-- Renamer always imports these data decls replete with constructors
-- so that desugarer can always see the constructor. Ugh!
-cCallishTyKeys = [ addrTyConKey, wordTyConKey, byteArrayTyConKey,
- mutableByteArrayTyConKey, foreignObjTyConKey ]
+cCallishTyKeys =
+ [ addrTyConKey
+ , wordTyConKey
+ , byteArrayTyConKey
+ , mutableByteArrayTyConKey
+ , foreignObjTyConKey
+ , stablePtrTyConKey
+ ]
standardClassKeys
= derivableClassKeys ++ numericClassKeys ++ cCallishClassKeys
noDictClassKeys -- These classes are used only for type annotations;
-- they are not implemented by dictionaries, ever.
= cCallishClassKeys
- -- I used to think that class Eval belonged in here, but
- -- we really want functions with type (Eval a => ...) and that
- -- means that we really want to pass a placeholder for an Eval
- -- dictionary. The unit tuple is what we'll get if we leave things
- -- alone, and that'll do for now. Could arrange to drop that parameter
- -- in the end.
\end{code}
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