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6.19.1.4 Case Sensitivity

Scheme as defined in R5RS is not case sensitive when reading symbols. Guile, on the contrary is case sensitive by default, so the identifiers

guile-whuzzy
Guile-Whuzzy

are the same in R5RS Scheme, but are different in Guile.

It is possible to turn off case sensitivity in Guile by setting the reader option case-insensitive. For more information on reader options, See Scheme Read.

(read-enable 'case-insensitive)

It is also possible to disable (or enable) case sensitivity within a single file by placing the reader directives #!fold-case (or #!no-fold-case) within the file itself.