dart2js cps: Track existence of try statements in resolution instead of traversing AST/IR nodes to …

pkg/compiler/lib/src/resolution/members.dart

 // Copyright (c) 2012, 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.
 
 library dart2js.resolution.members;
 
 import '../common/names.dart' show
     Selectors;
 import '../compiler.dart' show
     Compiler;
@@ skipping 4545 matching lines @@
     visitIn(node.statements, new BlockScope(scope));
     return const NoneResult();
   }
 
   ResolutionResult visitCaseMatch(CaseMatch node) {
     visit(node.expression);
     return const NoneResult();
   }
 
   ResolutionResult visitTryStatement(TryStatement node) {
+    // TODO(karlklose): also track the information about mutated variables, catch, and

[Kevin Millikin (Google), 2015/09/07 09:11:17]

I guess that's a long line.

+    // finally-block.
+    elements.hasTryStatement = true;
+
     visit(node.tryBlock);
     if (node.catchBlocks.isEmpty && node.finallyBlock == null) {
       error(node.getEndToken().next, MessageKind.NO_CATCH_NOR_FINALLY);
     }
     visit(node.catchBlocks);
     visit(node.finallyBlock);
     return const NoneResult();
   }
 
   ResolutionResult visitCatchBlock(CatchBlock node) {
@@ skipping 68 matching lines @@
     }
     return const NoneResult();
   }
 }
 
 /// Looks up [name] in [scope] and unwraps the result.
 Element lookupInScope(Compiler compiler, Node node,
                       Scope scope, String name) {
   return Elements.unwrap(scope.lookup(name), compiler, node);
 }