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# Std library types
The `std` library provides many custom types which expands drastically on
the `primitives`. Some of these include:
* growable `String`s like: `"hello world"`
* growable vectors: `[1, 2, 3]`
* optional types: `Option<i32>`
* error handling types: `Result<i32, i32>`
* heap allocated pointers: `Box<i32>`
### See also:
[primitives] and [the std library][std]
[primitives]: primitives.md
[std]: https://doc.rust-lang.org/std/
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