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docs: add import notice for extension methods #2042

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19 changes: 19 additions & 0 deletions _overviews/scala3-book/ca-extension-methods.md
Original file line number Diff line number Diff line change
Expand Up @@ -50,6 +50,25 @@ Then in your code you use `circumference` just as though it was originally defin
aCircle.circumference
```

### Import extension method

Imagine, that `circumference` is defined in package `lib`, you can import it by

```scala
import lib.circumference

aCircle.circumference
```

The compiler also support you if the import is missing by showing a detailed compilation error message such as the following:

```text
value circumference is not a member of Circle, but could be made available as an extension method.

The following import might fix the problem:

import lib.circumference
```

## Discussion

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