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Guile 3.0.10 does not support this. How to reproduce: $ tr -d '$' > foo.scm <<\EOF (begin #!r6rs (display "Hello \$ mama") (display "Hello \ $ papa")) EOF $ guile foo.scm =3D> ice-9/read.scm:126:4: In procedure read-string: /home/bruno/foo.scm:5:21: invalid character in escape sequence: #\space $ guile --version guile (GNU Guile) 3.0.10 =2E..