Dealing with "unused lexical variable" warnings

lisp-unit.lsp had a few "Unused lexical variable" warnings showing in Clozure Common Lisp version 1.9 that I've (declare)d as (ignore). Also koans/lists.lsp had an unused variable some-events because of no asserts on that variable (I assumed it was a small omission and changed the second assert to use some-events).