Template Haskell: allow type splices

[ghc-hetmet.git] / compiler / typecheck / TcType.lhs

diff --git a/compiler/typecheck/TcType.lhs b/compiler/typecheck/TcType.lhs
index 6b326b0..738f1cd 100644 (file)
--- a/compiler/typecheck/TcType.lhs
+++ b/compiler/typecheck/TcType.lhs
@@ -74,7 +74,7 @@ module TcType (
   isPredTy, isDictTy, isDictLikeTy,
   tcSplitDFunTy, tcSplitDFunHead, predTyUnique, 
   mkClassPred, isInheritablePred, isIPPred, 
-  dataConsStupidTheta, isRefineableTy, isRefineablePred,
+  isRefineableTy, isRefineablePred,
 
   ---------------------------------
   -- Foreign import and export
@@ -124,7 +124,8 @@ module TcType (
   typeKind, tidyKind,
 
   tyVarsOfType, tyVarsOfTypes, tyVarsOfPred, tyVarsOfTheta,
-  tcTyVarsOfType, tcTyVarsOfTypes, exactTyVarsOfType, exactTyVarsOfTypes,
+  tcTyVarsOfType, tcTyVarsOfTypes, tcTyVarsOfPred, exactTyVarsOfType,
+  exactTyVarsOfTypes, 
 
   pprKind, pprParendKind,
   pprType, pprParendType, pprTypeApp, pprTyThingCategory,
@@ -140,7 +141,6 @@ import DataCon
 import Class
 import Var
 import ForeignCall
-import Unify
 import VarSet
 import Type
 import Coercion
@@ -353,6 +353,7 @@ data UserTypeCtxt
   | ForSigCtxt Name    -- Foreign inport or export signature
   | DefaultDeclCtxt    -- Types in a default declaration
   | SpecInstCtxt       -- SPECIALISE instance pragma
+  | ThBrackCtxt                -- Template Haskell type brackets [t| ... |]
 
 -- Notes re TySynCtxt
 -- We allow type synonyms that aren't types; e.g.  type List = []
@@ -410,6 +411,7 @@ pprUserTypeCtxt ExprSigCtxt     = ptext (sLit "an expression type signature")
 pprUserTypeCtxt (ConArgCtxt c)  = ptext (sLit "the type of the constructor") <+> quotes (ppr c)
 pprUserTypeCtxt (TySynCtxt c)   = ptext (sLit "the RHS of the type synonym") <+> quotes (ppr c)
 pprUserTypeCtxt GenPatCtxt      = ptext (sLit "the type pattern of a generic definition")
+pprUserTypeCtxt ThBrackCtxt     = ptext (sLit "a Template Haskell quotation [t|...|]")
 pprUserTypeCtxt LamPatSigCtxt   = ptext (sLit "a pattern type signature")
 pprUserTypeCtxt BindPatSigCtxt  = ptext (sLit "a pattern type signature")
 pprUserTypeCtxt ResSigCtxt      = ptext (sLit "a result type signature")
@@ -962,28 +964,6 @@ substEqSpec subst eq_spec = [ (substTyVar subst tv, substTy subst ty)
                            | (tv,ty) <- eq_spec]
 \end{code}
 
---------------------- The stupid theta (sigh) ---------------------------------
-
-\begin{code}
-dataConsStupidTheta :: [DataCon] -> ThetaType
--- Union the stupid thetas from all the specified constructors (non-empty)
--- All the constructors should have the same result type, modulo alpha conversion
--- The resulting ThetaType uses type variables from the *first* constructor in the list
---
--- It's here because it's used in MkId.mkRecordSelId, and in TcExpr
-dataConsStupidTheta (con1:cons)
-  = nubBy tcEqPred all_preds
-  where
-    all_preds    = dataConStupidTheta con1 ++ other_stupids
-    res_ty1       = dataConOrigResTy con1
-    other_stupids = [ substPred subst pred
-                   | con <- cons
-                   , let (tvs, _, _, res_ty) = dataConSig con
-                         Just subst = tcMatchTy (mkVarSet tvs) res_ty res_ty1
-                   , pred <- dataConStupidTheta con ]
-dataConsStupidTheta [] = panic "dataConsStupidTheta"
-\end{code}
-
 
 %************************************************************************
 %*                                                                     *