Don't print duplicate stack traces/errors when things crash

environment.go

@@ -347,7 +347,6 @@ func (this *environment) runRunnable(ctx context.Context, actor Runnable) (stopE
 			return
 		} else {
 			// failure
-			log.Printf("XXX [%s] failed: %v", typ, err)
 			if this.flags.crashOnError {
 				panic(fmt.Sprint(err))
 			}
@@ -358,6 +357,10 @@ func (this *environment) runRunnable(ctx context.Context, actor Runnable) (stopE
 				stopErr = err
 				return
 			}
+
+			// print the failure message here because we won't be
+			// returning to run().
+			log.Printf("XXX [%s] failed: %v", typ, err)
 		}
 
 		// restart logic