More shared messages.

pkg/dart_messages/lib/shared_messages.dart

 // Copyright (c) 2015, 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.
 
 // An update to this file must be followed by regenerating the corresponding
 // json, dart2js and analyzer file. Use `publish.dart` in the bin directory.
 //
 // Every message in this file must have an id. Use `message_id.dart` in the
 // bin directory to generate a fresh one.
 
@@ skipping 386 matching lines @@
       examples: const ["class A { class B {} } main() { new A(); }",]),
 
   'CONSTRUCTOR_WITH_RETURN_TYPE': new Message(
       id: 'VOJBWY',
       category: Category.parserError,
       template: "Constructors can't have a return type",
       howToFix: "Try removing the return type.",
       usedBy: [analyzer, dart2js],
       examples: const ["class A { int A() {} } main() { new A(); }",]),
 
+  'MISSING_EXPRESSION_IN_THROW': new Message(
+      id: 'FTGGMJ',
+      subId: 0,
+      category: Category.parserError,
+      template: "Throw expressions must compute the object to be thrown.",

[Siggi Cherem (dart-lang), 2016/02/18 21:04:13]

nit: in this case I prefer the old message we used to have in dart2js, I somehow
find the "compute" here a bit misleading.

Some ideas:
- No expression after 'throw'.
- Throw missing the subexpression to be thrown.
- Throw expression missing an argument to be thrown.

[floitsch, 2016/02/18 21:12:18]

Going with "Missing expression after 'throw'."
Perfectly happy to change to something else (in a follow up CL).

+      howToFix: "Did you mean 'rethrow'?",
+      usedBy: [
+        analyzer,
+        dart2js
+      ],
+      examples: const [
+        'main() { throw; }',
+        'main() { try { throw 0; } catch(e) { throw; } }'
+      ]),
+
+  /**
+   * 12.8.1 Rethrow: It is a compile-time error if an expression of the form
+   * <i>rethrow;</i> is not enclosed within a on-catch clause.
+   */
+  'RETHROW_OUTSIDE_CATCH': new Message(
+      id: 'MWETLC',
+      category: Category.compileTimeError,
+      template: 'Rethrow must be inside of catch clause',
+      howToFix: "Try moving the expression into a catch clause, or "
+          "using a 'throw' expression.",
+      usedBy: [analyzer, dart2js],
+      examples: const ["main() { rethrow; }"]),
+
   /**
    * 13.12 Return: It is a compile-time error if a return statement of the form
    * <i>return e;</i> appears in a generative constructor.
    */
   'RETURN_IN_GENERATIVE_CONSTRUCTOR': new Message(
       id: 'UOTDQH',
       category: Category.compileTimeError,
       template: "Constructors can't return values.",
       howToFix:
           "Try removing the return statement or using a factory constructor.",
@@ skipping 32 matching lines @@
         """
         foo() async* { return 0; }
         main() => foo();
         """,
         """
         foo() sync* { return 0; }
         main() => foo();
         """
       ]),
 };