use_value.diff

diff --git a/mimir/src/test/scala/quasar/mimir/EvaluatorSpecs.scala b/mimir/src/test/scala/quasar/mimir/EvaluatorSpecs.scala
index 8f9bb9c8c8..466aa14eb8 100644
--- a/mimir/src/test/scala/quasar/mimir/EvaluatorSpecs.scala
+++ b/mimir/src/test/scala/quasar/mimir/EvaluatorSpecs.scala
@@ -39,6 +39,10 @@ trait EvaluatorSpecification[M[+_]] extends Specification with EvaluatorTestSupp
   def M = Need.need.asInstanceOf[scalaz.Monad[M] with scalaz.Comonad[M]]
 }

+trait EvaluatorValueSpecification[M[+_]] extends Specification with EvaluatorTestSupport[M] {
+  def M = Value.value.asInstanceOf[scalaz.Monad[M] with scalaz.Comonad[M]]
+}
+
 trait EvaluatorTestSupport[M[+_]] extends StdLibEvaluatorStack[M]
     with BaseBlockStoreTestModule[M]
     with IdSourceScannerModule
diff --git a/mimir/src/test/scala/quasar/mimir/StringLibSpecs.scala b/mimir/src/test/scala/quasar/mimir/StringLibSpecs.scala
index 2d8d155edb..896060ac4c 100644
--- a/mimir/src/test/scala/quasar/mimir/StringLibSpecs.scala
+++ b/mimir/src/test/scala/quasar/mimir/StringLibSpecs.scala
@@ -20,7 +20,7 @@ import quasar.precog.common._
 import quasar.yggdrasil._
 import scalaz._

-trait StringLibSpecs[M[+_]] extends EvaluatorSpecification[M]
+trait StringLibSpecs[M[+_]] extends EvaluatorValueSpecification[M]
     with LongIdMemoryDatasetConsumer[M] { self =>

   import dag._
@@ -886,4 +886,4 @@ trait StringLibSpecs[M[+_]] extends EvaluatorSpecification[M]
   }
 }

-object StringLibSpecs extends StringLibSpecs[Need]
+object StringLibSpecs extends StringLibSpecs[Value]