libxkbcommon/test/data/keymaps/invalid-escape-sequence.xkb

xkb_keymap {
    // The following include statement has an octal escape sequence that
    // must be ignored. Else it would insert a NULL character and thus
    // truncates the string to "evde", while we expect "evdev+aliases(qwerty)".
    xkb_keycodes  { include "evde\0v+aliases(qwerty)" };
    // The following include statement has two octal escape sequences that
    // should be ignored, else they would overflow.
    xkb_types     { include "com\401ple\777te" };
    xkb_compat    { include "complete" };
    xkb_symbols   { include "pc+us" };
};