usecrate::rewrite::RewriteCtxtRef;/// World's simplest rewrite strategy: just hope the two ASTs are already equal! Returns success
/// (and does nothing) if they are; returns failure (and still does nothing) if they aren't.
pubfnrewrite<T:PartialEq<T>>(old:&T, new:&T, _rcx: RewriteCtxtRef)->bool{
old == new
}