prelude: :gerbil/compiler/ssxi
package: std/srfi/159

(begin
  (declare-type std/srfi/159/unicode#unicode-char-width (@lambda 1 #f))
  (declare-type std/srfi/159/unicode#unicode-terminal-width (@lambda (1) #f))
  (declare-type std/srfi/159/unicode#as-unicode (@lambda (0) #f)))
