Q

(qsym . sym) -> lst
Returns a cons pair of the value and property list of sym. See also quote, val and getl.

: (setq A 1234)
-> 1234
: (put 'A 'a 1)
-> 1
: (put 'A 'b 2)
-> 2
: (put 'A 'f T)
-> T
: (qsym . A)
-> (1234 f (2 . b) (1 . a))
(quote . any) -> any
Returns any unevaluated. The reader recognizes the single quote char ' as a macro for this function. See also lit.

: 'a
-> a
: '(foo a b c)
-> (foo a b c)
: (quote (quote (quote a)))
-> ('('(a)))
(query 'lst ['lst]) -> flg
Handles an interactive Pilog query. The two lst arguments are passed to prove. query displays each result, waits for console input, and terminates when a non-empty line is entered. See also ?, pilog and solve.

: (query (goal '((append @X @Y (a b c)))))
 @X=NIL @Y=(a b c)
 @X=(a) @Y=(b c).   # Stop
-> NIL
(queue 'var 'any) -> any
Implements a queue using a list in var. The any argument is (destructively) concatenated to the end of the value list. See also push, pop and fifo.

: (queue 'A 1)
-> 1
: (queue 'A 2)
-> 2
: (queue 'A 3)
-> 3
: A
-> (1 2 3)
: (pop 'A)
-> 1
: A
-> (2 3)
(quit ['any ['any]])
Stops current execution. If no arguments are given, all pending finally expressions are executed and control is returned to the top level read-eval-print loop. Otherwise, an error handler is entered. The first argument can be some error message, and the second might be the reason for the error. See also Error Handling.

: (de foo (X) (quit "Sorry, my error" X))
-> foo
: (foo 123)                                  # 'X' is bound to '123'
123 -- Sorry, my error                       # Error entered
? X                                          # Inspect 'X'
-> 123
?                                            # Empty line: Exit
: