compiler warnings - Warn about name shadowing in scala 2.11 -

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i'm using sbt build project , have in build.scala:

scalacoptions ++= seq("-unchecked", "-deprecation", "-feature", "-xfatal-warnings")

how can configure project warn on name/variable shadowing? i've browsed source here , here, don't see i'm looking among many options. comment on this old question mentions flag -ywarn-shadowing doesn't seem exist.

as indicated in related question, start exploring -x. tried -xlint:help , yields settings shadowing:

information:scalac: enable or disable specific warnings   adapted-args               warn if argument list modified match                               receiver.   nullary-unit               warn when nullary methods return unit.   inaccessible               warn inaccessible types in method signatures.   nullary-override           warn when non-nullary `def f()' overrides nullary                               `def f'.   infer-any                  warn when type argument inferred `any`.   missing-interpolator       string literal appears missing                               interpolator id.   doc-detached               scaladoc comment appears detached                               element.   private-shadow             private field (or class parameter) shadows                               superclass field.   type-parameter-shadow      local type parameter shadows type in                               scope.   poly-implicit-overload     parameterized overloaded implicit methods not                               visible view bounds.   option-implicit            option.apply used implicit view.   delayedinit-select         selecting member of delayedinit.   by-name-right-associative  by-name parameter of right associative operator.   package-object-classes     class or object defined in package object.   unsound-match              pattern match may not typesafe.   stars-align                pattern sequence wildcard must align sequence                               component.

probably -xlint:private-shadow want?


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