From: simonpj@microsoft.com <unknown>
Date: Wed, 18 Oct 2006 11:24:18 +0000 (+0000)
Subject: Add comment about arity
X-Git-Url: http://git.megacz.com/?p=ghc-hetmet.git;a=commitdiff_plain;h=5e41a5afcc39480f4e60055843a5e4106b6f8875

Add comment about arity

I'm not sure what the significance of the "arity" of a primtive
TyCon is.  They aren't necessarily saturated, so it's not that.

I rather think that arity is only relevant for
	SynTyCon
	AlgTyCon
	CoercionTyCon

This comment (and commit message) is just an aide memoire.
---

diff --git a/compiler/types/TyCon.lhs b/compiler/types/TyCon.lhs
index fc27995..3ae5c3e 100644
--- a/compiler/types/TyCon.lhs
+++ b/compiler/types/TyCon.lhs
@@ -173,7 +173,8 @@ data TyCon
 	tyConUnique   :: Unique,
 	tyConName     :: Name,
 	tyConKind     :: Kind,
-	tyConArity    :: Arity,
+	tyConArity    :: Arity,		-- SLPJ Oct06: I'm not sure what the significance
+					--	       of the arity of a primtycon is!
 
 	primTyConRep  :: PrimRep,
 			-- Many primitive tycons are unboxed, but some are