Fix incorrect forward-declaration #680

Job	Run time
conan-package / Calculate version numbers / Generate version numbers	26s
conan-package / Make the proper runners list	-1s
conan-package / Upload latest package recipe / Upload package recipe	23s
conan-package / Upload specific package recipe / Upload package recipe	29s
conan-package / Build package	0s
npm-package / publish-npm	6m 20s
	7m 37s

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