Copy-paste fix pattern
fn main() {
array queue = []
if (len(queue) > 0) {
println(array.pop(queue))
} else {
println("queue empty")
}
}Why it happens
A function needed at least one item, but the array had none.
How to fix it
Check len(array) before pop, pick, min, max, or selection helpers.
Runtime and Studio now show this kind of page from the error dialog: plain message first, stable code second, original details third.