[project @ 2003-12-17 11:29:40 by simonpj]

[ghc-hetmet.git] / ghc / compiler / deSugar / Desugar.lhs

diff --git a/ghc/compiler/deSugar/Desugar.lhs b/ghc/compiler/deSugar/Desugar.lhs
index d95ca8c..879058e 100644 (file)
--- a/ghc/compiler/deSugar/Desugar.lhs
+++ b/ghc/compiler/deSugar/Desugar.lhs
@@ -261,7 +261,7 @@ dsRule in_scope (L loc (HsRule name act vars lhs rhs))
     returnDs (fn, Rule name act tpl_vars args core_rhs)
   where
     tpl_vars = [var | RuleBndr (L _ var) <- vars]
-    all_vars = mkInScopeSet (in_scope `unionVarSet` mkVarSet tpl_vars)
+    all_vars = mkInScopeSet (extendVarSetList in_scope tpl_vars)
 
 ds_lhs all_vars lhs
   = let