lldb - error: invalid thread #i

Question

I am trying to perform some debugging using LLDB on a buggy code:

@IBAction func somePrettyAction(sender: AnyObject) {
    let names = ["LLDB", "is", "fun", "Kudos :)"]
    println("out of index name: \(names[5])")
}

So when app crashed at println (for obvious reasons ;)), I typed -'Thread Info' at XCode debugger console, and it gave me below output:

thread #1: tid = 0x6fbc, 0x000000010ee5f1d0 libswiftCore.dylib`Swift._fatalErrorMessage (Swift.StaticString, Swift.StaticString, Swift.StaticString, Swift.UInt) -> () + 160, queue = 'com.apple.main-thread', stop reason = EXC_BAD_INSTRUCTION (code=EXC_I386_INVOP, subcode=0x0)

but when I typed - 't i', it showed below message:

error: invalid thread #i.

As per related wwdc video short form of given command should work, but for some reasons it is not working, any ideas?

Answer 1

Yeah, I noticed that too. The presentation is incorrect. That's not the abbreviation for thread info. A suitable abbreviation now is th i.

Using t is the abbreviation for thread select. Thus, t 2 is equivalent to thread select 2.

Type help at the (lldb) prompt, and it will show you a list of the current abbreviations.