rangeTo or the .. operator instead of calls to until.
Using corresponding functions makes your code simpler.
The quick-fix replaces rangeTo or the .. call with until.
Example:
fun foo(a: Int) {
for (i in 0..a - 1) {
}
}
After the quick-fix is applied:
fun foo(a: Int) {
for (i in 0 until a) {
}
}