오, Quasi-quotation 신기하다. 문자열 안에 아스키 글자를 넣으면 컴파일 에러가 나네!

library/Book.hs:221:18: error:
    • Must be only ASCII characters.
    • In the quasi-quotation: [A.string|GET ♫ HTTP/1.1|]
    |
221 |   line [A.string|GET ♫ HTTP/1.1|] <>
    |                  ^^^^^^^^^^^^^^^^
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