Fix Trac #1122; spot absence of TyCon in data/newtype header

diff --git a/compiler/parser/RdrHsSyn.lhs b/compiler/parser/RdrHsSyn.lhs
index 895c8a8..ddff68f 100644 (file)
--- a/compiler/parser/RdrHsSyn.lhs
+++ b/compiler/parser/RdrHsSyn.lhs
@@ -54,7 +54,7 @@ module RdrHsSyn (
 #include "HsVersions.h"
 
 import HsSyn           -- Lots of it
-import RdrName         ( RdrName, isRdrTyVar, mkUnqual, rdrNameOcc, 
+import RdrName         ( RdrName, isRdrTyVar, isRdrTc, mkUnqual, rdrNameOcc, 
                          isRdrDataCon, isUnqual, getRdrName, isQual,
                          setRdrNameSpace )
 import BasicTypes      ( maxPrecedence, Activation, InlineSpec(..), alwaysInlineSpec, neverInlineSpec )
@@ -468,13 +468,12 @@ checkTyClHdr (L l cxt) ty
   where
     gol (L l ty) acc = go l ty acc
 
-    go l (HsTyVar tc)    acc 
-       | not (isRdrTyVar tc)   = do
-                                   tvs <- extractTyVars acc
-                                   return (L l tc, tvs, acc)
-    go l (HsOpTy t1 tc t2) acc  = do
-                                   tvs <- extractTyVars (t1:t2:acc)
-                                   return (tc, tvs, acc)
+    go l (HsTyVar tc) acc 
+       | isRdrTc tc            = do tvs <- extractTyVars acc
+                                    return (L l tc, tvs, acc)
+    go l (HsOpTy t1 ltc@(L _ tc) t2) acc
+       | isRdrTc tc            = do tvs <- extractTyVars (t1:t2:acc)
+                                    return (ltc, tvs, acc)
     go l (HsParTy ty)    acc    = gol ty acc
     go l (HsAppTy t1 t2) acc    = gol t1 (t2:acc)
     go l other          acc    =