Re-run with -feature for details

Question

When I compile scala in play console, I got this: ``` [warn] there were 1 feature warning(s); re-run with -feature for details [warn] one warning found ``` I thought it means `compile -feature`, but I got this: ``` [error] Expected ID character [error] Not a valid command: compile (similar: completions) [error] Expected project ID [error] Expected configuration [error] Expected ':' (if selecting a configuration) [error] Expected key [error] Expected '::' [error] Expected end of input. [error] compile -feature [error] ``` Then I run `play -feature`, I got this: ``` [warn] The `-` command is deprecated in favor of `onFailure` and will be removed in 0.14.0 ``` And play quit. So how should I do this?

Accepted Answer

You have to add

```
scalacOptions += "-feature"
```

to your `build.sbt` and execute `reload` if your sbt console is running (or restart it).

Alternatively if you want to set it only for a single session, while in sbt console.

```
set scalacOptions += "-feature"
```

You can write, this setting is applied immediately, no need to reload or restart sbt console.

Re-run with -feature for details

Solution

Problem