d23 s2

2017/d23/main.rkt

@@ -6,7 +6,6 @@
      (time (STARS (vector (λ () TOKS) ...)))))
 
 (define regs (make-hasheq))
-(struct offset-signal (val))
 
 (provide set mul sub jnz)
 (define-macro (value VAL) #'(let ([val 'VAL]) (if (number? val) val (hash-ref! regs val 0))))
@@ -14,14 +13,18 @@
 (define-macro (sub REG VAL) #'(hash-update! regs 'REG (λ (val) (- val (value VAL))) 0))
 (define-macro (mul REG VAL) #'(begin (hash-update! regs 'mul-count add1 0)
                                      (hash-update! regs 'REG (λ (val) (* val (value VAL))) 0)))
-(define-macro (jnz REG VAL) #'(when (not (zero? (value REG))) (raise (offset-signal (value VAL)))))
+(define-macro (jnz REG VAL) #'(when (not (zero? (value REG))) (raise (value VAL))))
 
-(define (★ insts)
+(define (★ insts [final-key 'mul-count])
   (for/fold ([offset 0]
-             #:result (hash-ref regs 'mul-count))
+             #:result (hash-ref regs final-key))
             ([i (in-naturals)]
              #:break (not (<= 0 offset (sub1 (vector-length insts)))))
-    (with-handlers ([offset-signal? (λ (os) (+ (offset-signal-val os) offset))])
+    (with-handlers ([integer? (λ (num) (+ num offset))])
-      (define proc (vector-ref insts offset))
+      (define inst (vector-ref insts offset))
-      (proc)
+      (inst)
       (add1 offset))))
+
+(define (★★ insts)
+  (hash-set! regs 'a 1)
+  (★ insts 'h))

2017/d23/star2.rkt

@@ -0,0 +1,2 @@
+#lang reader "main.rkt" ★★ ; to be fair, this question had nothing to do with Racket
+set h 911