Why I can't get VSCode type hint?

I am sorry, maybe it's a silly question.

I clone miette.

git clone  https://github.com/zkat/miette.git

And followed the Contributing.md to setup it.

cd path/to/your/clone
cargo test --features fancy

But when I switch to file src/handlers/graphical.rs, I can't get VSCode type hint, for example, I can't use cmd + click to jump into the implementation.

I want to know how I can get type hint of this file. It will be better if you can tell me why!

My VSCode Version: 1.76.2
Rust-analyzer Version: v0.4.1447

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