[ref]: https://example.com (bar)
[other-ref]: https://example.com (Shakespeare's "Romeo and Juliet" is a famous play)

[a]: https://example.com "\""
[a]: https://example.com '\"'
[a]: https://example.com (\")

[a]: https://example.com "\'"
[a]: https://example.com '\''
[a]: https://example.com (\')

[a]: https://example.com "\'"
[a]: https://example.com '\)'
[a]: https://example.com (\))

<!-- mis-parsing, `\` are missing: -->

[a]: https://example.com "\\\""
[a]: https://example.com '\\\''
[a] https://example.com (\\\))

[a]: https://example.com "\\'"
[a]: https://example.com '\\"'
[a]: https://example.com (\\")