All YAAM instructions are now brackedted, so Op introduced an { and EndOp introduces an }. This is because Ricardo assumes that.
Fix attvars when COROUTING is undefined.
git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@1516 b08c6af1-5177-4d33-ba66-4b1c6b8b522a