dart2dart: Implementation of simple try/catch.

pkg/compiler/lib/src/tree_ir/optimization/logical_rewriter.dart

 // Copyright (c) 2014, 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.
 
 part of tree_ir.optimization;
 
 /// Rewrites logical expressions to be more compact in the Tree IR.
 ///
 /// In this class an expression is said to occur in "boolean context" if
 /// its result is immediately applied to boolean conversion.
@@ skipping 153 matching lines @@
     return node;
   }
 
   Statement visitWhileCondition(WhileCondition node) {
     node.condition = makeCondition(node.condition, true, liftNots: false);
     node.body = visitStatement(node.body);
     node.next = visitStatement(node.next);
     return node;
   }
 
+  Statement visitTryStatement(TryStatement node) {
+    node.tryBody = visitStatement(node.tryBody);
+    node.catchBody = visitStatement(node.catchBody);
+    return node;
+  }
+
   Statement visitExpressionStatement(ExpressionStatement node) {
     node.expression = visitExpression(node.expression);
     node.next = visitStatement(node.next);
     return node;
   }
 
 
   Expression visitVariable(Variable node) {
     return node;
   }
@@ skipping 299 matching lines @@
   }
 
   /// Destructively updates each entry of [l] with the result of visiting it.
   void _rewriteList(List<Expression> l) {
     for (int i = 0; i < l.length; i++) {
       l[i] = visitExpression(l[i]);
     }
   }
 }