muJSStatement (JSForVarIn _ _ _ (JSVarInitExpression id _) _ gen _ body)    = muForIn muJsVarPattern id gen body
muJSStatement (JSForVarIn _ _ _ (JSVarInitExpression id _) _ gen _ body)    = muForIn muJsVarPattern id gen body
muJSStatement (JSForVarIn _ _ _ (JSVarInitExpression id _) _ gen _ body)    = muForIn muJsVarPattern id gen body