and class else false for fun if nil or return super this true var while

# expect: AND and null
# expect: CLASS class null
# expect: ELSE else null
# expect: FALSE false null
# expect: FOR for null
# expect: FUN fun null
# expect: IF if null
# expect: NIL nil null
# expect: OR or null
# expect: RETURN return null
# expect: SUPER super null
# expect: THIS this null
# expect: TRUE true null
# expect: VAR var null
# expect: WHILE while null
# expect: EOF  null