path-string -- r7rs Type open-input-file;open-binary-input-file;open-output-file;open-binary-output-file;call-with-input-file;call-with-output-file;file-exists?;delete-file;with-input-from-file;with-output-to-file;include;include-ci;load;syntax-error;string?;string-append;string-copy;string-copy!;string-fill!;substring;string=?;string<?;string>?;string<=?;string>=?;string-ci=?;string-ci<?;string-ci>?;string-ci<=?;string-ci>=?;string->list;string->vector;string-map;string-for-each;string->utf8;open-input-string;write-string;error;string-length;string-ref;string-set!;string->number;string->symbol;string-upcase;string-downcase;string-foldcase;get-environment-variable;Note: These definitions consume an input that is a super-type.