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add directions for using external types #254

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add directions for using external types #254

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2a9635b
add directions for using external types
hypernumbers May 29, 2023
e2576e1
Merge branch 'master' into gordonguthrie/import_types
hypernumbers May 29, 2023
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28 changes: 28 additions & 0 deletions book-src/tour/external-types.md
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Expand Up @@ -17,3 +17,31 @@ pub external fn length(Queue(a)) -> Int = "queue" "len"

pub external fn push(Queue(a), a) -> Queue(a) = "queue" "in"
```

When you need an external type you must use the `import` command to bring them into a module.

There are two ways to refer to an external type.

The first is an explicit named import:

```rust,noplaypen
import mytypes.{MySpecialType}

...

fn myfun(x: MySpecialType) -> Int

...
```

The second is a general import with name:

```rust,noplaypen
import mytypes

...

fn myfun(x: mytypes.MySpecialType) -> Int

...
```