Use: add alias use foo as bar form

examples/to-lisp.rs

@@ -178,6 +178,7 @@ impl<'a> Visit<'a> for ToLisp {
         match item {
             Use::Glob => print!("(use-glob)"),
             Use::Name(name) => name.visit_in(self)?,
+            Use::Alias(name, alias) => print!("(use-alias {name} {alias})"),
             Use::Path(name, tree) => {
                 print!("(use-path {name} ");
                 tree.visit_in(self)?;