core.async

• Type: Defect
• Status: Open
• Priority: Minor
• Resolution: Unresolved
• Affects Version/s: None
• Fix Version/s: None
• Component/s: None
• Labels:

  • try-catch

In ClojureScript, `(catch :default e ...) in a `go` block fails with non-`js/Error` classes. That is, throwing e.g. a number, a String, etc. fails (not that this is good practice anyway, but still). I came upon this while porting Slingshot (scgilardi/slingshot) to CLJS.

Given the following tests:

```
(defn test0
"Prints 'Error: nil'."
[]
(go (println "Error:"
(<! (go (throw (js/Error.)))))))

(defn test1
"Prints 'Error: #object[Error Error]'."
[]
(go (println "Error:"
(<! (go (try (throw (js/Error.))
(catch :default e e)))))))

(defn test2
"Doesn't print anything in addition to the console error
msg. Chrome says 'Uncaught 123'."
[]
(go (println "Error:"
(<! (go (try (throw 123)
(catch :default e e)))))))
```

`test2` should print 'Error: 123', but doesn't.

(As a sidenote, shouldn't `test0` return the thrown js/Error instead of printing to the console that there was an uncaught error and returning nil?)

• Assignee:

  Unassigned

  Reporter:

  Alex Gunnarson

• Created:

  27/Jul/16 3:48 PM

  Updated:

  13/Feb/17 3:40 PM