prelude: :gerbil/compiler/ssxi
package: scheme

(begin
  (declare-type scheme/base-ports#input-port-open? (@lambda 1 #f))
  (declare-type scheme/base-ports#output-port-open? (@lambda 1 #f))
  (declare-type scheme/base-ports#port-buffered-chars? (@lambda 1 #f))
  (declare-type scheme/base-ports#check-byte-port/lock! (@lambda 2 #f))
  (declare-type scheme/base-ports#peek-u8 (@lambda 1 #f)))
