Silence macrotasks warnings in downstream-tests

Author: japgolly

downstream-tests/build.sbt

@@ -14,11 +14,12 @@ def scalacCommonFlags: Seq[String] = Seq(
   "-language:higherKinds",
   "-language:existentials",
   "-unchecked",
+  "-Wconf:msg=may.not.be.exhaustive:e",            // Make non-exhaustive matches errors instead of warnings
+  "-Wconf:msg=Reference.to.uninitialized.value:e", // Make uninitialised value calls errors instead of warnings
+  "-Wconf:msg=macrotask:s",                        // stfu about macrotasks
 )
 
 def scalac2Flags = Seq(
-  "-Wconf:msg=may.not.be.exhaustive:e",            // Make non-exhaustive matches errors instead of warnings
-  "-Wconf:msg=Reference.to.uninitialized.value:e", // Make uninitialised value calls errors instead of warnings
   "-Wunused:explicits",                            // Warn if an explicit parameter is unused.
   "-Wunused:implicits",                            // Warn if an implicit parameter is unused.
   "-Wunused:imports",                              // Warn if an import selector is not referenced.