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28.1.4 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. More on reader options can be found at (see Reader options).

(read-enable 'case-insensitive)

Note that this is seldom a problem, because Scheme programmers tend not to use uppercase letters in their identifiers anyway.