crash when stack level too deep while printing error message

[Jomy10]

I got a crash because of a try! at:

RubyGateway/Sources/RubyGateway/RbError.swift

Line 217 in 416dd4e

let exceptionClass = try! exception.get("class")

The error message was "stack level too deep". However, when I turned it into a try?, the error message printed fine, but without the exceptionClass name.

I can open a pr for this, but I wasn't sure how you'd like to see this fixed. I have this:

public var description: String {
    if let exceptionClass = try? exception.get("class") {
        return "\(exceptionClass): \(exception)"
    } else {
        return "\(exception)"
    }
}

Also don't know if there's a better way to get the exception name without this error to happen.

[johnfairh]

Do you have a sample to reproduce this?

I'll look at this as part of #55; I have some open-source time later in the month & will spend some of it on this project.

[Jomy10]

I'll have to see if I can still reproduce this reliably. I'll keep you updated.

[johnfairh]

Ok - don't put yourself out, I'm sure I can recreate it!

[johnfairh]

It turns out I actually wrote a testRubyStackOverflow that correctly reports an error of SystemStackError: stack level too deep so I'm not sure what happened for you.

Anyway, the fix you've suggested works fine for the case I can recreate.