* gnu/system/uuid.scm (uuid): When STR is not a literal, return #f when 'string->uuid' returns #f. * tests/uuid.scm ("uuid, dynamic value"): New test.
* gnu/system/uuid.scm (uuid): When STR is not a literal, return #f when 'string->uuid' returns #f. * tests/uuid.scm ("uuid, dynamic value"): New test.