From 0c33d6168e1eda13ee260ee71fa03365ab2cad52 Mon Sep 17 00:00:00 2001
From: Anthony Ramine <n.oxyde@gmail.com>
Date: Fri, 8 Sep 2017 10:21:28 +0200
Subject: [PATCH] Panic from the default impl of Runnable::handler

This will allow us to make sure that tasks using main_thread_handler don't
actually get consumed through a call to the bare handler method.
---
 components/script/script_thread.rs | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/components/script/script_thread.rs b/components/script/script_thread.rs
index 1a69c10dcfa..207e47572e7 100644
--- a/components/script/script_thread.rs
+++ b/components/script/script_thread.rs
@@ -251,7 +251,9 @@ where
 
 pub trait Runnable {
     fn name(&self) -> &'static str { unsafe { intrinsics::type_name::<Self>() } }
-    fn handler(self: Box<Self>) {}
+    fn handler(self: Box<Self>) {
+        panic!("This should probably be redefined.")
+    }
     fn main_thread_handler(self: Box<Self>, _script_thread: &ScriptThread) { self.handler(); }
 }