diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 426027c..cf327fa 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -21,6 +21,7 @@ jobs:
                 dc: [dmd-latest, ldc-latest]
                 arch: [x86_64]
                 include:
+                  - { os: ubuntu-latest, dc: dmd-2.096.1, arch: x86_64 }
                   - { os: windows-latest, dc: dmd-2.092.0, arch: x86_64 }
                   - { os: windows-latest, dc: dmd-2.092.0, arch: x86_mscoff }
                   - { os: windows-latest, dc: dmd-2.091.1, arch: x86_64 }
diff --git a/dub.sdl b/dub.sdl
index b6210be..bedef09 100644
--- a/dub.sdl
+++ b/dub.sdl
@@ -28,9 +28,9 @@ configuration "select" {
 	subConfiguration "eventcore" "select"
 	versions "Windows7" platform="windows"
 }
-configuration "libasync" {
-	subConfiguration "eventcore" "libasync"
-}
+//configuration "libasync" {
+//	subConfiguration "eventcore" "libasync"
+//}
 
 buildType "unittest" {
 	buildOptions "unittests" "debugMode" "debugInfo"
diff --git a/source/vibe/core/file.d b/source/vibe/core/file.d
index cb2ff1b..4680b7d 100644
--- a/source/vibe/core/file.d
+++ b/source/vibe/core/file.d
@@ -699,6 +699,13 @@ scope:
 
 	~this()
 	nothrow {
+		if (this.isOpen) {
+			if (m_ctx.driver is (() @trusted => cast(shared)eventDriver)()) {
+				try close();
+				catch (Exception e) logException(e, "Closing unclosed FileStream during destruction failed");
+			} else logWarn("Destroying FileStream that is still open in a foreign thread (leaked to GC?). This may lead to crashes.");
+		}
+
 		if (m_fd != FileFD.invalid)
 			releaseHandle!"files"(m_fd, m_ctx.driver);
 	}
diff --git a/source/vibe/core/log.d b/source/vibe/core/log.d
index e5e85cc..8c67421 100644
--- a/source/vibe/core/log.d
+++ b/source/vibe/core/log.d
@@ -833,7 +833,6 @@ final class SyslogLogger(StreamCallback) : Logger
 	@safe nothrow {
 		ubyte[4096] buf;
 
-
 		try {
 			auto ostr = m_streamCallback();
 
@@ -846,6 +845,8 @@ final class SyslogLogger(StreamCallback) : Logger
 					while (m_buffer.empty) {
 						if (m_buffer.capacity == 0) {
 							ostr.finalize();
+							static if (is(typeof(ostr.close())))
+								ostr.close();
 							return;
 						}
 						() @trusted { m_bufferCondition.wait(); } ();
diff --git a/source/vibe/core/task.d b/source/vibe/core/task.d
index 6c9f214..fd68144 100644
--- a/source/vibe/core/task.d
+++ b/source/vibe/core/task.d
@@ -39,7 +39,7 @@ struct Task {
 		m_taskCounter = task_counter;
 	}
 
-	this(in Task other)
+	this(const Task other)
 	@safe nothrow {
 		m_fiber = () @trusted { return cast(shared(TaskFiber))other.m_fiber; } ();
 		m_taskCounter = other.m_taskCounter;
diff --git a/source/vibe/internal/async.d b/source/vibe/internal/async.d
index 2dd70d9..a8f1bf8 100644
--- a/source/vibe/internal/async.d
+++ b/source/vibe/internal/async.d
@@ -258,7 +258,7 @@ private template hasAnyScopeParameter(Callback) {
 	else enum hasAnyScopeParameter = any!(c => c & ParameterStorageClass.scope_)([SC]);
 }
 
-static if (is(noreturn)) // issue 299, requires newer host compilers
+static if (is(noreturn)) static if (is(ReturnType!(() => assert(0)) == noreturn)) // issue 299, requires newer host compilers
 version (unittest) {
 	alias CB = noreturn delegate(int) @safe nothrow;
 	alias wait   = delegate noreturn(_)    => assert(0);