Why can I omit the name of the module?

1

in file key.rs of rustls crate，it defines the pub struct Certificate(pub Vec)

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then in lib.rs of rustls crate, it defines its interfaces
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then we use the Certificate struct in mesalink like this
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Why can it omit the the name "key" after rustls?

2

That's what pub use does - it reexports a type in a different location (in this case the root of the crate).

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3

So every single "middle name " can be omitted, right ?

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4

Yes, every one of those can be omitted when you import it into your project.

5

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