ADDED   runs-launch-loop-test.scm
Index: runs-launch-loop-test.scm
==================================================================
--- /dev/null
+++ runs-launch-loop-test.scm
@@ -0,0 +1,59 @@
+(use srfi-69)
+
+(define (runs:queue-next-hed tal reg n regful)
+  (if regful
+      (car reg)
+      (car tal)))
+
+(define (runs:queue-next-tal tal reg n regful)
+  (if regful
+      tal
+      (let ((newtal (cdr tal)))
+	(if (null? newtal)
+	    reg
+	    newtal
+	    ))))
+
+(define (runs:queue-next-reg tal reg n regful)
+  (if regful
+      (cdr reg)
+      (if (eq? (length tal) 1)
+	  '()
+	  reg)))
+
+(use trace)
+(trace runs:queue-next-hed
+       runs:queue-next-tal
+       runs:queue-next-reg)
+
+
+(define tests '(1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20))
+
+(define test-registry (make-hash-table))
+
+(define n 3)
+
+(let loop ((hed   (car tests))
+           (tal   (cdr tests))
+           (reg   '()))
+  (let* ((reglen (length reg))
+	 (regful (> reglen n)))
+    (print "hed=" hed ", length reg=" (length reg) ", (> lenreg n)=" (> (length reg) n))
+    (let ((newtal (append tal (list hed)))) ;; used if we are not done with this test
+      (cond
+       ((not (hash-table-ref/default test-registry hed #f))
+	(hash-table-set! test-registry hed #t)
+	(print "Registering #" hed)
+	(if (not (null? tal))
+          (loop (runs:queue-next-hed tal reg n regful)
+                (runs:queue-next-tal tal reg n regful)
+		(let ((newl (append reg (list hed))))
+		  (if regful
+		      (cdr newl)
+		      newl)))))
+       (else
+	(print "Running #" hed)
+	(if (not (null? tal))
+	    (loop (runs:queue-next-hed tal reg n regful)
+		  (runs:queue-next-tal tal reg n regful)
+		  (runs:queue-next-reg tal reg n regful))))))))