wenzelm [Tue, 23 Oct 2001 19:12:37 +0200] rev 11899
* Pure: removed obsolete 'exported' attribute;
* Pure: dummy pattern "_" in is/let is now automatically ``lifted''
over bound variables: "ALL x. P x --> Q x" (is "ALL x. _ --> ?C x")
supersedes more cumbersome ... (is "ALL x. _ x --> ?C x");