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Update implementing_a_command.md (#3848)

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+  nu-command/src/command.rs has been modified to nu-command/src/mod.rs in nowable version
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ken.chen 2021-07-27 22:03:52 +08:00 committed by GitHub
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docs/implementing_a_command.md
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@ -86,7 +86,7 @@ pub struct Command;
Before registering it to the context you need to make it available by declaring the module and re-export it in `crates/nu-command/src/commands.rs`. The commands we write are modules already (`take_two.rs` is the `take_two` module). In case you are not familiar with rust modules [read this refresher](https://doc.rust-lang.org/book/ch07-02-defining-modules-to-control-scope-and-privacy.html). Let's go ahead and declare it and then re-export the command's `Command` struct as `TakeTwo`, like so:
_nu-command/src/commands.rs_
_nu-command/src/mod.rs_
```rust
# ...
pub(crate) mod take_two;