.

wcfs/δbtail_test.go

@@ -266,17 +266,31 @@ func (rbs RBucketSet) Get(k Key) *RBucket {
 		return rbs[i].hi > k
 	})
 	if i == len(rbs) {
-		panic(fmt.Sprintf("BUG: key %v not covered", k))
+		panic(fmt.Sprintf("BUG: key %v not covered;  coverage: %s", k, rbs.coverage()))
 	}
 
 	rb := rbs[i]
 	if !(rb.lo <= k && k < rb.hi) {
-		panic(fmt.Sprintf("BUG: get(%v) -> [%v, %v)", k, rb.lo, rb.hi))
+		panic(fmt.Sprintf("BUG: get(%v) -> [%v, %v);  coverage: %s", k, rb.lo, rb.hi, rbs.coverage()))
 	}
 
 	return rb
 }
 
+func (rbs RBucketSet) coverage() string {
+	if len(rbs) == 0 {
+		return "ø"
+	}
+	s := ""
+	for _, rb := range rbs {
+		if s != "" {
+			s += " "
+		}
+		s += fmt.Sprintf("[%v, %v)", rb.lo, rb.hi)
+	}
+	return s
+}
+
 
 
 // XGetTree loads Tree from zurl@at->obj<root>.