Evaluation aborted as calling CLOSURE by providing the input of the predicate in .satisfies.

[APIPLM]

As going through the section ".SATISFIES : the parser predicate" in the tutorial. Then I have the input of the predicate digit-char-p to make the CLOSURE for .satisfies , see the below.

(setq ss (.bind (.item) 
        (lambda (x) 
          (if (apply #'digit-char-p x)
              (.identity x)
              (.fail)))))

Then call (funcall ss "1 and") ,then it evaluation aborted. See the following backtrace

  0: ((LAMBDA (X)) #\1)
  1: ((LAMBDA (INPUT) :IN .BIND) "1 and")
  2: (SB-INT:SIMPLE-EVAL-IN-LEXENV (FUNCALL SS "1 and") #<NULL-LEXENV>)
  3: (EVAL (FUNCALL SS "1 and"))

[APIPLM]

The question might not relate to this library.