Fix silent error, add custom panic handler (#2098)

This is to work around Tokio's panic recovery feature.
Ref https://github.com/tokio-rs/tokio/issues/495
Ref https://github.com/tokio-rs/tokio/issues/209
Ref https://github.com/denoland/deno/issues/1311
Fixes #2097

1 files changed, 1 insertions, 1 deletions

diff --git a/cli/worker.rs b/cli/worker.rs
index dea5e534a..7178639c5 100644
--- a/cli/worker.rs
+++ b/cli/worker.rs
@@ -324,7 +324,7 @@ mod tests {
         onmessage = function(e) {
           console.log("msg from main script", e.data);
           if (e.data == "exit") {
-            close();
+            delete window.onmessage;
             return;
           } else {
             console.assert(e.data === "hi");