Command failed due to signal: Abort trap: 6

Question

Since Xcode 7 and Swift 2.0, I get the error above, like in the screenshot shown here:

Answer 1

This is what caused the error for me.

Before:

    for (key,value) in hash{
        count += value.count
    }

After:

    for (_,value) in hash{
        count += value.count
    }

It didn't like it that key was never being used anywhere. I am not sure why it should cause the build to fail though.