FILE: plusAssignNullable.kt
    public abstract interface A : R|kotlin/Any| {
        public abstract val list: R|kotlin/collections/List<kotlin/String>|
            public get(): R|kotlin/collections/List<kotlin/String>|

    }
    public abstract interface B : R|kotlin/Any| {
        public abstract val list: R|kotlin/collections/MutableList<kotlin/String>|
            public get(): R|kotlin/collections/MutableList<kotlin/String>|

    }
    public final fun R|B|.foo(a: R|A?|): R|kotlin/Unit| {
        this@R|/foo|.R|/B.list|.R|kotlin/collections/plusAssign|<R|kotlin/String|>(R|kotlin/collections/mutableListOf|<R|kotlin/String|>(vararg(String())))
        R|kotlin/with|<R|A?|, R|kotlin/Unit|>(R|<local>/a|, <L> = with@fun R|A?|.<anonymous>(): R|kotlin/Unit| <inline=Inline, kind=EXACTLY_ONCE>  {
            this@R|/foo|.R|/B.list|.R|kotlin/collections/plusAssign|<R|kotlin/String|>(R|kotlin/collections/mutableListOf|<R|kotlin/String|>(vararg(String())))
            this@R|/foo|.R|/B.list|.R|kotlin/collections/plusAssign|<R|kotlin/String|>(R|kotlin/collections/mutableListOf|<R|kotlin/String|>(vararg(String())))
        }
        )
    }