val typeParameters: List<ApiTypeUsage> by unsafeLazy {
        context.apiTypeParametersFor(visitedSignature)
    }

    val functions: List<ApiFunction> by unsafeLazy {
        delegate.methods.filter(::isSignificantDeclaration).map { ApiFunction(asmLevel, incubatingAnnotationTypeDescriptor, this, it, context) }
    }

    private
    fun singleAbstractMethodOf(classNode: ClassNode) =