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WASI FileExt::tell is gone, breaks build #385

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@Mrmaxmeier

Hi,

building cap-std against wasm32-wasip1 fails with the following compiler error with recent nightlies:

error[E0782]: expected a type, found a trait
   --> cap-std/src/fs/file.rs:528:9
    |
528 |         std::os::wasi::fs::FileExt::tell(&self.std)
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
help: you can add the `dyn` keyword if you want a trait object
    |
528 |         <dyn std::os::wasi::fs::FileExt>::tell(&self.std)
    |         ++++                           +

For more information about this error, try `rustc --explain E0782`.

The method was removed here: rust-lang/rust#137205

(I'm not sure how cap-std handles version bumps considering that WASI support depends on the unstable wasi_ext feature but I guess just removing the fn tell(&self) from cap-std's extension trait might be fine?)

Thanks! 🙂

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