UFile (package = )
    UClass (name = InnerNonFixedTypeVariableKt)
        UMethod (name = test)
            UParameter (name = list)
                UAnnotation (fqName = org.jetbrains.annotations.NotNull)
            UBlockExpression
                UQualifiedReferenceExpression
                    UQualifiedReferenceExpression
                        USimpleNameReferenceExpression (identifier = list)
                        UCallExpression (kind = UastCallKind(name='method_call'), argCount = 0))
                            UIdentifier (Identifier (filterIsInstance))
                            USimpleNameReferenceExpression (identifier = filterIsInstance, resolvesTo = null)
                    UCallExpression (kind = UastCallKind(name='method_call'), argCount = 2))
                        UIdentifier (Identifier (mapTo))
                        USimpleNameReferenceExpression (identifier = <anonymous class>, resolvesTo = null)
                        UCallExpression (kind = UastCallKind(name='method_call'), argCount = 0))
                            UIdentifier (Identifier (mutableSetOf))
                            USimpleNameReferenceExpression (identifier = mutableSetOf, resolvesTo = null)
                        ULambdaExpression
                            UBlockExpression
    UClass (name = Some)
        UMethod (name = Some)
