Feature

Is auto-tupling enabled?

Check that experimental compiler options are only set for snapshot or nightly compiler versions.

Is feature enabled by either a command line setting or an import?

Is feature enabled by by an import? This is the case if the feature is imported by a named import

 import owner.feature

and there is no visible nested import that excludes the feature, as in

 import owner.{ feature => _ }

Is feature enabled by by a command-line setting? The enabling setting is

 -language:<prefix>feature

where is the fully qualified name of owner, followed by a ".", but subtracting the prefix scala.language. at the front.

If current source migrates to version, issue given warning message and return true, otherwise return false.