diff --git a/stdlib/public/Concurrency/CooperativeExecutor.swift b/stdlib/public/Concurrency/CooperativeExecutor.swift
index 607037427eb9..59ea3bb90512 100644
--- a/stdlib/public/Concurrency/CooperativeExecutor.swift
+++ b/stdlib/public/Concurrency/CooperativeExecutor.swift
@@ -270,7 +270,6 @@ extension CooperativeExecutor: SchedulingExecutor {
       suspendingWaitQueue.enqueue(job, after: duration)
     } else {
       fatalError("Sorry, cannot schedule on an unknown clock")
-      return
     }
   }
 
diff --git a/stdlib/public/Concurrency/DispatchExecutor.swift b/stdlib/public/Concurrency/DispatchExecutor.swift
index d3de652bdc46..2867c8dfec7a 100644
--- a/stdlib/public/Concurrency/DispatchExecutor.swift
+++ b/stdlib/public/Concurrency/DispatchExecutor.swift
@@ -151,7 +151,6 @@ fileprivate func _dispatchEnqueue<C: Clock, E: Executor>(
   guard let (clockID, seconds, nanoseconds) = timestamp(for: instant,
                                                         clock: clock) else {
     fatalError("Sorry, cannot schedule on an unknown clock")
-    return
   }
 
   let tolSec: Int64, tolNanosec: Int64
diff --git a/stdlib/public/Concurrency/Executor.swift b/stdlib/public/Concurrency/Executor.swift
index 63d9195873c2..4be09ab21565 100644
--- a/stdlib/public/Concurrency/Executor.swift
+++ b/stdlib/public/Concurrency/Executor.swift
@@ -156,7 +156,7 @@ extension Executor {
   @available(StdlibDeploymentTarget 6.3, *)
   internal var isMainExecutor: Bool {
     #if os(WASI) || !$Embedded
-    return self is MainExecutor
+    return self is any MainExecutor
     #else
     return false
     #endif