Feature

Is auto-tupling enabled?

Is capture checking enabled for this compilation unit?

Is capture checking enabled by a command-line setting?

Is captureChecking enabled for any of the currently compiled compilation units?

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:feature

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

Experimental language imports that imply that the importing unit is experimental.

Handle a global language import import language... Sets the compilation unit's and current run's fields accordingly.

Is pureFunctions enabled for this compilation unit?

Is pureFunctions enabled for any of the currently compiled compilation units?

Is safe mode set for this compilation unit?

Is separation checking enabled for this compilation unit?

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

Global language imports that affect parsing and must be handled specially. These need per-compilation-unit flags (set in handleGlobalLanguageImport) and also require propagation to rootCtx in the REPL and hoisting in the snippet compiler so they take effect across inputs (i16250).