UFile (package = ) [public final class DefaultParameterValuesKt {...]
    UClass (name = DefaultParameterValuesKt) [public final class DefaultParameterValuesKt {...}]
        UMethod (name = foo) [public static final fun foo(@org.jetbrains.annotations.NotNull a: int, @org.jetbrains.annotations.Nullable foo: java.lang.String) : void {...}]
            UParameter (name = a) [@org.jetbrains.annotations.NotNull var a: int = 1]
                UAnnotation (fqName = org.jetbrains.annotations.NotNull) [@org.jetbrains.annotations.NotNull]
                ULiteralExpression (value = 1) [1] = 1
            UParameter (name = foo) [@org.jetbrains.annotations.Nullable var foo: java.lang.String = null]
                UAnnotation (fqName = org.jetbrains.annotations.Nullable) [@org.jetbrains.annotations.Nullable]
                ULiteralExpression (value = null) [null] = null
            UBlockExpression [{...}] = Undetermined
