FILE: bareTypesWithFlexibleArguments.kt
    public final fun <T> R|kotlin/collections/Collection<T>?|.concat(collection: R|kotlin/collections/Collection<T>|): R|kotlin/collections/Collection<T>?| {
        when () {
            (this@R|/concat| is R|java/util/LinkedHashSet<T>|) ->  {
                this@R|/concat|.R|SubstitutionOverride<java/util/LinkedHashSet.addAll: R|kotlin/Boolean|>|(R|<local>/collection|)
                ^concat this@R|/concat|
            }
        }

        ^concat this@R|/concat|
    }
