From: simonpj@microsoft.com <unknown>
Date: Wed, 18 Aug 2010 06:54:36 +0000 (+0000)
Subject: Pretty printing change
X-Git-Tag: 2010-11-18~390
X-Git-Url: http://git.megacz.com/?p=ghc-hetmet.git;a=commitdiff_plain;h=9c83ea50dcfb5c5ada888cf956560df641afb130

Pretty printing change
---

diff --git a/compiler/types/TypeRep.lhs b/compiler/types/TypeRep.lhs
index 55beb28..74e0bdf 100644
--- a/compiler/types/TypeRep.lhs
+++ b/compiler/types/TypeRep.lhs
@@ -449,7 +449,8 @@ pprClassPred :: Class -> [Type] -> SDoc
 pprClassPred clas tys = ppr_type_app TopPrec (getName clas) tys
 
 pprTheta :: ThetaType -> SDoc
-pprTheta theta = parens (sep (punctuate comma (map pprPred theta)))
+pprTheta [pred] = pprPred pred
+pprTheta theta  = parens (sep (punctuate comma (map pprPred theta)))
 
 pprThetaArrow :: ThetaType -> SDoc
 pprThetaArrow []     = empty