def test_lex_comment():
assert lex("1; foo\n2") == lex("1\n2")
assert lex('; 1') == lex('')
assert lex(';') == lex('')
def test_lex_unquotes():
assert lex("~x") == ['~', 'x']
assert lex("~@x") == ['~@', 'x']
def test_lex():
assert lex("(1, 2)") == ['(', '1', '2', ')']