Fix several bugs in closure conversion.

pkg/kernel/testcases/closures/blocks.dart

Index: pkg/kernel/testcases/closures/blocks.dart
diff --git a/pkg/kernel/testcases/closures/blocks.dart b/pkg/kernel/testcases/closures/blocks.dart
new file mode 100644
index 0000000000000000000000000000000000000000..5e694190e073d49a34b5ef42e0fa8521ba83b9c8
--- /dev/null
+++ b/pkg/kernel/testcases/closures/blocks.dart
@@ -0,0 +1,48 @@
+/*
+ * Copyright (c) 2017, the Dart project authors.  Please see the AUTHORS file
+ * for details. All rights reserved. Use of this source code is governed by a
+ * BSD-style license that can be found in the LICENSE file.
+ */

[Dmitry Stefantsov, 2017/08/24 09:41:13]

Please, write a short description of the test here and at the other new test
cases.  It's hard to guess the intention when the test is more complex than a
few simple idiomatic lines.

[sjindel, 2017/08/24 11:11:43]

Done.

[Dmitry Stefantsov, 2017/08/24 11:49:57]

Thanks!  It would be nice to boil down this test case to its essential part
though.  But feel free to live it as it is.

+class X {}
+
+typedef dynamic fn(dynamic x);
+typedef dynamic fn2(dynamic x, dynamic y);
+
+void startIsolateMock(
+    dynamic parentPort,
+    dynamic entryPoint,
+    dynamic args,
+    dynamic message,
+    dynamic isSpawnUri,
+    dynamic controlPort,
+    List<dynamic> capabilities) {
+  if (controlPort != null) {
+    controlPort.handler = (dynamic _) {};
+  }
+  if (parentPort != null) {
+    dynamic readyMessage = new List<dynamic>(2);
+    readyMessage[0] = controlPort.sendPort;
+    readyMessage[1] = capabilities;
+    capabilities = null;
+    parentPort.send(readyMessage);
+  }
+  assert(capabilities == null);
+  dynamic port = "abc";
+  port.handler = (dynamic _) {
+    port.close();
+    if (isSpawnUri) {
+      if (entryPoint is fn2) {
+        entryPoint.call(args, message);
+      } else if (entryPoint is fn) {
+        entryPoint.call(args);
+      } else {
+        entryPoint.call();
+      }
+    } else {
+      entryPoint.call(message);
+    }
+  };
+  port.sendPort.send(null);
+}
+
+main() {}

[Dmitry Stefantsov, 2017/08/24 09:41:13]

Also, a comment describing why [main] is empty would be great.  Another solution
is to actually put something into [main] :)

[sjindel, 2017/08/24 11:11:43]

Done.