Improve Scope#interruptWhen error

typelevel · Sep 25, 2021 · fd2d836 · fd2d836
1 parent e59977f
commit fd2d836
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/core/shared/src/main/scala/fs2/internal/Scope.scala b/core/shared/src/main/scala/fs2/internal/Scope.scala
@@ -397,7 +397,7 @@ private[fs2] final class Scope[F[_]] private (
     interruptible match {
       case None =>
         F.raiseError(
-          new IllegalStateException("Scope#interrupt called for Scope that cannot be interrupted")
+          new IllegalStateException("Scope#interruptWhen called for Scope that cannot be interrupted. This can happen when a Stream uses Concurrent operations but is compiled with only a Sync constraint.")
         )
       case Some(iCtx) =>
         val outcome: F[InterruptionOutcome] = haltWhen.map(