Compilation error in pattern matching in Twirl 1.4.x

[takezoe]

The following template have worked in Twirl 1.3.15.

@defining(content.split(":")){ case Array(head, rest @ _*) =>
  ...
}

But it fails to compile with Expected '}' but found '@' in Twirl 1.4.1.

[takezoe]

This works:

@defining(content.split(":")){ case Array(head, rest @ _*) => {
  ...
}}

Is this intended change?

[mkurz]

Yes, kind of intended, that's a result of #192 and #194. We might want to add this to the Play Framework migration notes however.

[takezoe]

I see. Thanks.

We might want to add this to the Play Framework migration notes however.

This change will break a lot of Twirl based Play applications. So describing in Play's migration notes would help Play users.

[takezoe]

JFYI: Although this is not a Play application, I needed the following changes to migrate Twirl 1.3.x to 1.4.x: https://github.com/gitbucket/gitbucket/pull/2320/files

[ignasi35]

thanks for reporting @takezoe . Raised playframework/playframework#9411