Example

0001-Demo-tokio-swallowing-panics.patch

From 054728be9340f9b42db3665a919de9ffe113420b Mon Sep 17 00:00:00 2001
From: Ryan Dahl <ry@tinyclouds.org>
Date: Tue, 11 Dec 2018 12:29:13 -0500
Subject: [PATCH] Demo tokio swallowing panics

Try this: deno.readFile("/")
It should crash but it does not.
---
 src/ops.rs | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/ops.rs b/src/ops.rs
index 8e83887..01d74bb 100644
--- a/src/ops.rs
+++ b/src/ops.rs
@@ -761,10 +761,12 @@ fn op_read_file(
 ) -> Box<Op> {
   assert_eq!(data.len(), 0);
   let inner = base.inner_as_read_file().unwrap();
-  let cmd_id = base.cmd_id();
+  let _cmd_id = base.cmd_id();
   let filename = PathBuf::from(inner.filename().unwrap());
   debug!("op_read_file {}", filename.display());
   blocking(base.sync(), move || {
+    panic!("xxx")
+    /*
     let vec = fs::read(&filename)?;
     // Build the response message. memcpy data into inner.
     // TODO(ry) zero-copy.
@@ -785,6 +787,7 @@ fn op_read_file(
         ..Default::default()
       },
     ))
+    */
   })
 }
 
-- 
2.15.0