private
fun candidatesForExtensionFrom(type: ApiType): Sequence<ApiFunction> =
    type.functions.filter(::isCandidateForExtension).asSequence()


private
fun Sequence<ApiFunction>.sortedWithTypeOfTakingFunctionsFirst() =
    sortedBy { f ->
        if (f.parameters.any { it.type.isGradleTypeOf }) 0
        else 1
    }


private
fun ApiFunction.newMappedParameters() =

    }

    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) =