Split the JSON output into multiple lines.

pkg/compiler/lib/src/diagnostics/generated/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.
 /*
 DON'T EDIT. GENERATED. DON'T EDIT.
 This file has been generated by 'publish.dart' in the dart_messages package.
 
 Messages are maintained in `lib/shared_messages.dart` of that same package.
 After any change to that file, run `bin/publish.dart` to generate a new version
 of the json, dart2js and analyzer representations.
@@ skipping 55 matching lines @@
     ]
   ),  // Generated. Don't edit.
   MessageKind.CONSTRUCTOR_WITH_RETURN_TYPE: const MessageTemplate(
     MessageKind.CONSTRUCTOR_WITH_RETURN_TYPE,
     "Constructors can't have a return type",
     howToFix: "Try removing the return type.",
     examples: const [
       "class A { int A() {} } main() { new A(); }",
     ]
   ),  // Generated. Don't edit.
+  MessageKind.MISSING_EXPRESSION_IN_THROW: const MessageTemplate(
+    MessageKind.MISSING_EXPRESSION_IN_THROW,
+    "Throw expressions must compute the object to be thrown.",
+    howToFix: "Did you mean 'rethrow'?",
+    examples: const [
+      "main() { throw; }",
+      "main() { try { throw 0; } catch(e) { throw; } }",
+    ]
+  ),  // Generated. Don't edit.
+  MessageKind.RETHROW_OUTSIDE_CATCH: const MessageTemplate(
+    MessageKind.RETHROW_OUTSIDE_CATCH,
+    "Rethrow must be inside of catch clause",
+    howToFix: "Try moving the expression into a catch clause, or using a 'throw' expression.",
+    examples: const [
+      "main() { rethrow; }",
+    ]
+  ),  // Generated. Don't edit.
   MessageKind.RETURN_IN_GENERATIVE_CONSTRUCTOR: const MessageTemplate(
     MessageKind.RETURN_IN_GENERATIVE_CONSTRUCTOR,
     "Constructors can't return values.",
     howToFix: "Try removing the return statement or using a factory constructor.",
     examples: const [
       r"""
         class C {
           C() {
             return 1;
           }
@@ skipping 11 matching lines @@
         foo() async* { return 0; }
         main() => foo();
         """,
       r"""
         foo() sync* { return 0; }
         main() => foo();
         """,
     ]
   ),  // Generated. Don't edit.
 };