S9 LIB  (read-line)             ==>  string
        (read-line input-port)  ==>  string

Read a line from an input port. When no INPUT-PORT is specified,
read the current input port.

(with-input-from-file "lib/read-line.scm" read-line)
  ==>  "; Scheme 9 from Empty Space, Function Library"
