Tidy up the handling of wild-card binders, and make Lint check it

[ghc-hetmet.git] / compiler / prelude / PrelNames.lhs

diff --git a/compiler/prelude/PrelNames.lhs b/compiler/prelude/PrelNames.lhs
index e2e2dfe..4d3c446 100644 (file)
--- a/compiler/prelude/PrelNames.lhs
+++ b/compiler/prelude/PrelNames.lhs
@@ -58,7 +58,7 @@ import Unique   ( Unique, Uniquable(..), hasKey,
                    mkTupleTyConUnique
                  ) 
 import BasicTypes ( Boxity(..), Arity )
-import Name      ( Name, mkInternalName, mkExternalName )
+import Name       ( Name, mkInternalName, mkExternalName, mkSystemVarName )
 import SrcLoc
 import FastString
 \end{code}
@@ -136,9 +136,12 @@ basicKnownKeyNames
        traversableClassName,
 
        -- Numeric stuff
-       negateName, minusName, 
-       fromRationalName, fromIntegerName, 
-       geName, eqName, 
+        negateName, minusName, geName, eqName,
+
+        -- Conversion functions
+        fromRationalName, fromIntegerName,
+        toIntegerName, toRationalName,
+        fromIntegralName, realToFracName,
 
         -- String stuff
         fromStringName,
@@ -539,6 +542,9 @@ and it's convenient to write them all down in one place.
 
 
 \begin{code}
+wildCardName :: Name
+wildCardName = mkSystemVarName wildCardKey (fsLit "wild")
+
 runMainIOName :: Name
 runMainIOName = varQual gHC_TOP_HANDLER (fsLit "runMainIO") runMainKey
 
@@ -639,7 +645,7 @@ fstName, sndName :: Name
 fstName                  = varQual dATA_TUPLE (fsLit "fst") fstIdKey
 sndName                  = varQual dATA_TUPLE (fsLit "snd") sndIdKey
 
--- Module PrelNum
+-- Module GHC.Num
 numClassName, fromIntegerName, minusName, negateName, plusIntegerName,
     timesIntegerName,
     integerTyConName, smallIntegerName :: Name
@@ -652,10 +658,11 @@ timesIntegerName  = varQual  gHC_INTEGER (fsLit "timesInteger") timesIntegerIdKe
 integerTyConName  = tcQual   gHC_INTEGER_TYPE (fsLit "Integer") integerTyConKey
 smallIntegerName = varQual gHC_INTEGER (fsLit "smallInteger") smallIntegerIdKey
 
--- PrelReal types and classes
+-- GHC.Real types and classes
 rationalTyConName, ratioTyConName, ratioDataConName, realClassName,
     integralClassName, realFracClassName, fractionalClassName,
-    fromRationalName :: Name
+    fromRationalName, toIntegerName, toRationalName, fromIntegralName,
+    realToFracName :: Name
 rationalTyConName   = tcQual  gHC_REAL (fsLit "Rational") rationalTyConKey
 ratioTyConName     = tcQual  gHC_REAL (fsLit "Ratio") ratioTyConKey
 ratioDataConName    = conName gHC_REAL (fsLit ":%") ratioDataConKey
@@ -663,7 +670,11 @@ realClassName          = clsQual gHC_REAL (fsLit "Real") realClassKey
 integralClassName   = clsQual gHC_REAL (fsLit "Integral") integralClassKey
 realFracClassName   = clsQual gHC_REAL (fsLit "RealFrac") realFracClassKey
 fractionalClassName = clsQual gHC_REAL (fsLit "Fractional") fractionalClassKey
-fromRationalName    = methName gHC_REAL  (fsLit "fromRational") fromRationalClassOpKey
+fromRationalName    = methName gHC_REAL (fsLit "fromRational") fromRationalClassOpKey
+toIntegerName       = methName gHC_REAL (fsLit "toInteger") toIntegerClassOpKey
+toRationalName      = methName gHC_REAL (fsLit "toRational") toRationalClassOpKey
+fromIntegralName    = varQual  gHC_REAL (fsLit "fromIntegral") fromIntegralIdKey
+realToFracName      = varQual  gHC_REAL (fsLit "realToFrac") realToFracIdKey
 
 -- PrelFloat classes
 floatingClassName, realFloatClassName :: Name
@@ -1119,10 +1130,11 @@ absentErrorIdKey, augmentIdKey, appendIdKey, buildIdKey, errorIdKey,
     noMethodBindingErrorIdKey, nonExhaustiveGuardsErrorIdKey,
     runtimeErrorIdKey, parErrorIdKey, parIdKey, patErrorIdKey,
     realWorldPrimIdKey, recConErrorIdKey, recUpdErrorIdKey,
-    traceIdKey,
+    traceIdKey, wildCardKey,
     unpackCStringUtf8IdKey, unpackCStringAppendIdKey,
     unpackCStringFoldrIdKey, unpackCStringIdKey :: Unique
-absentErrorIdKey             = mkPreludeMiscIdUnique  1
+wildCardKey                   = mkPreludeMiscIdUnique  0  -- See Note [WildCard]
+absentErrorIdKey              = mkPreludeMiscIdUnique  1
 augmentIdKey                 = mkPreludeMiscIdUnique  3
 appendIdKey                  = mkPreludeMiscIdUnique  4
 buildIdKey                   = mkPreludeMiscIdUnique  5
@@ -1286,6 +1298,12 @@ fromStringClassOpKey           = mkPreludeMiscIdUnique 125
 toAnnotationWrapperIdKey :: Unique
 toAnnotationWrapperIdKey      = mkPreludeMiscIdUnique 126
 
+-- Conversion functions
+fromIntegralIdKey, realToFracIdKey, toIntegerClassOpKey, toRationalClassOpKey :: Unique
+fromIntegralIdKey    = mkPreludeMiscIdUnique 127
+realToFracIdKey      = mkPreludeMiscIdUnique 128
+toIntegerClassOpKey  = mkPreludeMiscIdUnique 129
+toRationalClassOpKey = mkPreludeMiscIdUnique 130
 
 ---------------- Template Haskell -------------------
 --     USES IdUniques 200-399