Fix call dyn for object member. #488

Job	Run time
docs	48s
host=ubuntu-22.04 cmd=cli target=x86_64-linux-gnu mode=release	3m 51s
host=ubuntu-22.04 cmd=cli target=x86_64-selinux-gnu mode=release	3m 45s
host=macos-12 cmd=cli target=x86_64-macos-none mode=release	3m 28s
host=macos-14 cmd=cli target=aarch64-macos-none mode=release	1m 59s
host=windows-2022 cmd=cli target=x86_64-windows-gnu mode=release	5m 24s
host=windows-2022 cmd=lib target=x86_64-windows-gnu mode=release	5m 28s
host=windows-2022 cmd=lib target=x86_64-windows-msvc mode=release	1m 26s
host=ubuntu-22.04 cmd=web-lib target=wasm32-freestanding mode=release	1m 39s
host=ubuntu-22.04 cmd=cli target=wasm32-wasi mode=release	1m 45s
host=ubuntu-22.04 cmd=lib target=x86_64-linux-gnu mode=release	3m 24s
host=macos-12 cmd=lib target=x86_64-macos-none mode=release	3m 20s
host=macos-14 cmd=lib target=aarch64-macos-none mode=release	2m 16s
Release	11s
	38m 44s

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