#include "HsVersions.h"
-import Var ( TyVar, mkSysTyVar )
-import Name ( Name )
+import Var ( TyVar, mkTyVar )
+import Name ( Name, mkLocalName )
+import OccName ( mkVarOcc )
import PrimRep ( PrimRep(..) )
import TyCon ( TyCon, ArgVrcs, mkPrimTyCon, mkLiftedPrimTyCon )
import Type ( mkTyConApp, mkTyConTy, mkTyVarTys, mkTyVarTy,
- unliftedTypeKind, liftedTypeKind, openTypeKind, mkArrowKinds
+ unliftedTypeKind, liftedTypeKind, openTypeKind,
+ Kind, mkArrowKinds
)
+import SrcLoc ( noSrcLoc )
import Unique ( mkAlphaTyVarUnique )
import PrelNames
+import FastString ( mkFastString )
import Outputable
+
+import Char ( ord, chr )
\end{code}
%************************************************************************
%* *
%************************************************************************
+alphaTyVars is a list of type variables for use in templates:
+ ["a", "b", ..., "z", "t1", "t2", ... ]
+
\begin{code}
+tyVarList :: Kind -> [TyVar]
+tyVarList kind = [ mkTyVar (mkLocalName (mkAlphaTyVarUnique u)
+ (mkVarOcc (mkFastString name))
+ noSrcLoc) kind
+ | u <- [2..],
+ let name | c <= 'z' = [c]
+ | otherwise = 't':show u
+ where c = chr (u-2 + ord 'a')
+ ]
+
alphaTyVars :: [TyVar]
-alphaTyVars = [ mkSysTyVar u liftedTypeKind
- | u <- map mkAlphaTyVarUnique [2..] ]
+alphaTyVars = tyVarList liftedTypeKind
betaTyVars = tail alphaTyVars
-- openAlphaTyVar is prepared to be instantiated
-- to a lifted or unlifted type variable. It's used for the
-- result type for "error", so that we can have (error Int# "Help")
-openAlphaTyVar :: TyVar
-openAlphaTyVar = mkSysTyVar (mkAlphaTyVarUnique 1) openTypeKind
-
openAlphaTyVars :: [TyVar]
-openAlphaTyVars = [ mkSysTyVar u openTypeKind
- | u <- map mkAlphaTyVarUnique [2..] ]
+openAlphaTyVars@(openAlphaTyVar:_) = tyVarList openTypeKind
openAlphaTy = mkTyVarTy openAlphaTyVar