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Back port of documentation changes to main #2900

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40 changes: 40 additions & 0 deletions website/docs/guides/power/markdown.md
Original file line number Diff line number Diff line change
Expand Up @@ -345,6 +345,46 @@ world

</ChainedSnippets>

### `ignore` in `scala` snippets

You can mark a `scala` code block with the `ignore` keyword, indicating that this snippet should not be run. This block will be ignored completely and will not be compiled or executed.

Below is an example of an `.md` file with an ignored `scala` snippet:

````markdown title=IgnoreExample.md
# `ignore` example
## Normal snippet
```scala
val message = "Hello world!"
println(message)
```

## Ignored snippet
```scala ignore
val message = "This must be ignored"
println(message)
1 / 0
```

````

<ChainedSnippets>

```bash
scala-cli --power IgnoreExample.md
```

We see output only from the `scala` snippet:

```text
Hello world!
```

</ChainedSnippets>

After execution of the above example, you can see that the ignored snippet was not run.
All errors and exceptions that would have been thrown by the `ignore` snippet are also absent.

## `shebang` header and Markdown code blocks
The `shebang` line in `scala` code blocks inside a markdown input are always ignored.
You can use them (i.e. to give an example of their usage), but they do not change how the code is handled.
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