rangeUntil extension function import marked as unused

[dalewking]

I have an extension function like this to allow you to say something like now..<5.minutes to get an open ended range of instants:

/**
 * Convenience method to convert an instant and a duration into an open-ended range of instants. For
 * example: `now..<5.minutes` produces an open-ended range from now until 5 minutes from now
 *
 * @receiver The starting instant of the range
 * @param duration The amount of time to add to the starting time to get the end of the range
 * @return An open-ended range that starts at `this` and ends before `this + duration`
 */
operator fun Instant.rangeUntil(duration: Duration): OpenEndRange<Instant> = this..<this + duration

Expected Behavior

When I add an import in another file to use this operator, ktlint should know that ..< corresponds to the rangeUntil function name and should not report the import of the rangeUntil name as unused

Observed Behavior

Ktlint reports an unused import on the rangeUntil operator

Steps to Reproduce

Define a rangeUntil extension operator function in one file and import it and use it in another file

[dalewking]

Ktlint is smart enough to do this for rangeTo function and the .. operator.

[dalewking]

I believe all that is needed is adding rangeUntil to this line: https://github.com/pinterest/ktlint/blob/master/ktlint-ruleset-standard/src/main/kotlin/com/pinterest/ktlint/ruleset/standard/rules/NoUnusedImportsRule.kt#L294

[paul-dingemans]

Tnx for suggestion. It was an easy fix.