Version 3.4.0-201.0.dev

Merge c0e089a into dev

pkg/_fe_analyzer_shared/lib/src/util/runtimes.dart

@@ -3,6 +3,7 @@
 // BSD-style license that can be found in the LICENSE file.
 
 import 'dart:isolate';
+import 'dart:typed_data';
 
 /// Whether the current runtime can register kernel blobs and launch kernel
 /// isolates.
@@ -11,10 +12,17 @@ bool get isKernelRuntime => _isKernelRuntime ??= _checkForKernelRuntime();
 bool? _isKernelRuntime;
 
 bool _checkForKernelRuntime() {
+  // `createUriForKernelBlob` throws `UnsupportedError` if kernel blobs are not
+  // supported at all. We don't actually want to register kernel so pass
+  // invalid kernel, an empty list, resulting in an `ArgumentError` if kernel
+  // blobs are supported.
   try {
-    (Isolate.current as dynamic).createUriForKernelBlob;
-    return true;
-  } catch (_) {
+    (Isolate.current as dynamic)
+        .createUriForKernelBlob(new Uint8List.fromList(const []));
+    throw new StateError('Expected failure.');
+  } on UnsupportedError {
     return false;
+  } on ArgumentError {
+    return true;
   }
 }