When I use vscode or lazyvim in neovide,I found somthing that pretty wired that there is no type infer. But it just occur in sha2 as code following:

use sha2::Digest;
fn main() {
    //there is no type infer for hasher,and no discreption for `new`
    let hasher = sha2::Sha256::new();
}

what is happening?where can I get efficient help?

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