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Here is the list of reader options generated by typing (read-options 'full) in Guile. You can also see the default values.

     keywords         #f      Style of keyword recognition: #f, 'prefix or 'postfix
     case-insensitive no      Convert symbols to lower case.
     positions        yes     Record positions of source code expressions.
     copy             no      Copy source code expressions.

Notice that while Standard Scheme is case insensitive, to ease translation of other Lisp dialects, notably Emacs Lisp, into Guile, Guile is case-sensitive by default.

To make Guile case insensitive, you can type

     (read-enable 'case-insensitive)