Slight improvement in TH error reporting

[ghc-hetmet.git] / compiler / hsSyn / Convert.lhs

diff --git a/compiler/hsSyn/Convert.lhs b/compiler/hsSyn/Convert.lhs
index 6c14c11..77e9e08 100644 (file)
--- a/compiler/hsSyn/Convert.lhs
+++ b/compiler/hsSyn/Convert.lhs
@@ -47,7 +47,11 @@ convertToHsDecls :: SrcSpan -> [TH.Dec] -> Either Message [LHsDecl RdrName]
 convertToHsDecls loc ds = initCvt loc (mapM cvtTop ds)
 
 convertToHsExpr :: SrcSpan -> TH.Exp -> Either Message (LHsExpr RdrName)
-convertToHsExpr loc e = initCvt loc (cvtl e)
+convertToHsExpr loc e 
+  = case initCvt loc (cvtl e) of
+       Left msg  -> Left (msg $$ (ptext SLIT("When converting TH expression")
+                                   <+> text (show e)))
+       Right res -> Right res
 
 convertToHsType :: SrcSpan -> TH.Type -> Either Message (LHsType RdrName)
 convertToHsType loc t = initCvt loc (cvtType t)