FILE: plusWithAssignSmartCast.kt
    public final class Foo : R|kotlin/Any| {
        public constructor(): R|Foo| {
            super<R|kotlin/Any|>()
        }

        public final var bar: R|kotlin/String?| = Null(null)
            public get(): R|kotlin/String?|
            public set(value: R|kotlin/String?|): R|kotlin/Unit|

        public final fun addToBar(other: R|kotlin/String|): R|kotlin/Unit| {
            when () {
                ==(this@R|/Foo|.R|/Foo.bar|, Null(null)) ->  {
                    this@R|/Foo|.R|/Foo.bar| = R|<local>/other|
                }
                else ->  {
                    this@R|/Foo|.R|/Foo.bar| = this@R|/Foo|.R|/Foo.bar|.R|kotlin/plus|(<strcat>(String( ), R|<local>/other|))
                }
            }

        }

    }