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docs: add an example to -Yindent-colons section #10534

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17 changes: 14 additions & 3 deletions docs/docs/reference/other-new-features/indentation.md
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Expand Up @@ -387,6 +387,17 @@ xs.map:
y * y
```

Colons at the end of lines are their own token, distinct from normal `:`.
The Scala grammar is changed in this variant so that colons at end of lines are accepted at all points
where an opening brace enclosing a function argument is legal. Special provisions are taken so that method result types can still use a colon on the end of a line, followed by the actual type on the next.
The colon is usable not only for lambdas and by-name parameters, but
also even for ordinary parameters:

```scala
credentials ++ :
val file = Path.userHome / ".credentials"
if file.exists
then Seq(Credentials(file))
else Seq()
```

How does this syntax variant work? Colons at the end of lines are their own token, distinct from normal `:`.
The Scala grammar is changed so that colons at end of lines are accepted at all points
where an opening brace enclosing an argument is legal. Special provisions are taken so that method result types can still use a colon on the end of a line, followed by the actual type on the next.