diff --git a/just-some-usage-code-that-must-compile/SomeUsageOfImplicitApi.hs b/just-some-usage-code-that-must-compile/SomeUsageOfImplicitApi.hs
--- a/just-some-usage-code-that-must-compile/SomeUsageOfImplicitApi.hs
+++ b/just-some-usage-code-that-must-compile/SomeUsageOfImplicitApi.hs
@@ -43,13 +43,14 @@
   addEvent "log" "rpc roundtrip end"
   withSpan "project" $ do
     -- Connecting spans across threads requires some manual plumbing
-    sp <- getCurrentActiveSpan
+    Just sp <- getCurrentActiveSpan
     asyncWork <- async $ withChildSpanOf sp "data science" $ do
       threadDelay 1000000
-      pure 42
+      pure (42 :: Int)
     -- Doing a withSpan inside a loop is fine
     forM_ [input .. input + 10] $ \i -> withSpan "sprint" $ do
       -- setTag "week" i
-      threadDelay 10000
-    wait asyncWork
+      threadDelay (10000 + i)
+    _ <- wait asyncWork
+    pure ()
   pure result
diff --git a/opentelemetry-lightstep.cabal b/opentelemetry-lightstep.cabal
--- a/opentelemetry-lightstep.cabal
+++ b/opentelemetry-lightstep.cabal
@@ -2,7 +2,7 @@
 name:                opentelemetry-lightstep
 description:         The OpenTelemetry Haskell Client (LightStep exporter) https://opentelemetry.io
 category:            OpenTelemetry
-version:             0.1.0
+version:             0.2.0
 license-file:        LICENSE
 license:             Apache-2.0
 author:              Dmitry Ivanov