const ca = r'x\n'

const cb = 'x\n'

const cc = ca + cb

const cd = cc + cc

const ce = cd + cd

fn test_raw_string_backslash() {
    assert r'\' == r'\'
}

fn test_raw_string_not_escaped_by_transformer() {
    assert r'a\nb' + r'a\nb' == r'a\nba\nb'
    assert 'a\nb' + r'a\nb' == 'a\nba\\nb'
}

fn test_raw_string_backslash_u() {
    assert r'\u0000004B' == r'\u0000004B'
    println(r'\u0000004B')
}

// this test will cause test failure (see #12604)
// fn test_many_pluses() {
//     a := r'x\n'
//     assert a == ca
//     b := 'x\n'
//     assert b == cb
//     c := a + b
//     assert c == cc // this fails
//     d := c + c
//     assert d == cd
//     e := d + d
//     assert e == ce
//     println(e)
//     result := r'x\nx
// x\nx
// x\nx
// x\nx
// '
//     assert e == result
// }