Minor type inference fixes to do with null and bottom types.

pkg/front_end/testcases/inference/coerce_bottom_and_null_types.dart

Index: pkg/front_end/testcases/inference/coerce_bottom_and_null_types.dart
diff --git a/pkg/front_end/testcases/inference/coerce_bottom_and_null_types.dart b/pkg/front_end/testcases/inference/coerce_bottom_and_null_types.dart
new file mode 100644
index 0000000000000000000000000000000000000000..7189891beece5aa116d8c90162960017c3b0294f
--- /dev/null
+++ b/pkg/front_end/testcases/inference/coerce_bottom_and_null_types.dart
@@ -0,0 +1,27 @@
+// 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.
+
+/*@testedFeatures=inference*/
+library test;
+
+f() {
+  var /*@type=int*/ a = 0;
+  var /*@type=dynamic*/ b = null;
+  var /*@type=dynamic*/ c = throw 'foo';
+  var /*@type=() -> int*/ d = /*@returnType=int*/ () => 0;
+  var /*@type=() -> dynamic*/ e = /*@returnType=dynamic*/ () => null;
+  var /*@type=() -> <BottomType>*/ f = /*@returnType=<BottomType>*/ () =>
+      throw 'foo';
+  var /*@type=() -> int*/ g = /*@returnType=int*/ () {
+    return 0;
+  };
+  var /*@type=() -> Null*/ h = /*@returnType=Null*/ () {
+    return null;
+  };
+  var /*@type=() -> <BottomType>*/ i = /*@returnType=<BottomType>*/ () {
+    return (throw 'foo');
+  };
+}
+
+main() {}