chore: cleanup day 20

day20/main.go

@@ -65,13 +65,9 @@ func run(scan *bufio.Scanner) (*result, error) {
 
 	// rx is present.. perform part 2.
 	if rx, ok := receivers["rx"]; ok {
-		var tip *conjunction
+		tip := m.m[rx[0]].(*conjunction) // panic if missing!
+
 		var lvalues []int
-
-		if p, ok := m.m[rx[0]].(*conjunction); ok {
-			tip = p
-		}
-
 		for k, v := range tip.pushes {
 			for i, h := range makeHistory(v) {
 				if i == 1 && len(h) > 0 && h[0] > 0 {