(){};,+-*!===<=>=!=<>/.

# expect: LEFT_PAREN ( null
# expect: RIGHT_PAREN ) null
# expect: LEFT_BRACE { null
# expect: RIGHT_BRACE } null
# expect: SEMICOLON ; null
# expect: COMMA , null
# expect: PLUS + null
# expect: MINUS - null
# expect: STAR * null
# expect: BANG_EQUAL != null
# expect: EQUAL_EQUAL == null
# expect: LESS_EQUAL <= null
# expect: GREATER_EQUAL >= null
# expect: BANG_EQUAL != null
# expect: LESS < null
# expect: GREATER > null
# expect: SLASH / null
# expect: DOT . null
# expect: EOF  null