Fixes regression caused by updating interpreter returns in eval. Cond now breaks the loop, rather than the switch

interpreter.go

@@ -90,27 +90,26 @@ func eval(exp expression, en *env) (value expression) {
 				value = exception("Invalid 'cond' syntax - too few arguments")
 				break
 			}
-			// CondLoop:
+			CondLoop:
 			for _, exp := range e[1:] {
 				switch i := exp.(type) {
 				case []expression:
 					if len(i) < 2 {
 						value = exception("Invalid 'cond' case, cases must take the form: `(<test> <expression>)")
-						break
+						break CondLoop
 					}
 					if i[0] == "else" || i[0] == symbol("else") {
 						value = eval(i[1], en)
-						break
+						break CondLoop
 					}
 					if AnythingToBool(eval(i[0], en)).(bool) {
 						value = eval(i[1], en)
-						break
+						break CondLoop
 					}
 				default:
 					value = exception("Invalid 'cond' case, cases must take the form: `(<test> <expression>)")
-					break
+					break CondLoop
 				}
-				value = make([]expression, 0)
 			}
 		case "set!":
 			if len(e) < 3 {