dart2dart: Implementation of simple try/catch.

pkg/compiler/lib/src/use_unused_api.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.
 
 /// This file use methods that aren't used by dart2js.dart, but that we wish to
 /// keep anyway. This might be general API that isn't currently in use,
 /// debugging aids, or API only used for testing (see TODO below).
 
 library dart2js.use_unused_api;
 
@@ skipping 45 matching lines @@
   useJsNode(new js.ArrayHole());
   useJsOther(new js.SimpleJavaScriptPrintingContext());
   useJsBackend(null);
   useConcreteTypesInferrer(null);
   useColor();
   useFilenames();
   useSsa(null);
   useCodeBuffer(null);
   usedByTests();
   useElements(null, null, null, null, null);
-  useIr(null, null, null);
+  useIr(null, null);
   useCompiler(null);
   useTypes();
   useCodeEmitterTask(null);
   useScript(null);
   useProgramBuilder(null);
 }
 
 useApi() {
   api.ReadStringFromUri uri;
 }
@@ skipping 157 matching lines @@
     PartialClassElement pce,
     PartialFunctionElement pfe) {
   e.lookupClassMember(null);
   e.lookupInterfaceMember(null);
   n.isAccessibleFrom(null);
   f.reuseElement();
   pce.copyWithEnclosing(null);
   pfe.copyWithEnclosing(null);
 }
 
-useIr(cps_ir_nodes_sexpr.SExpressionStringifier stringifier,
-      ir_builder.IrBuilderTask task,
+useIr(ir_builder.IrBuilderTask task,
       ir_builder.IrBuilder builder) {
-  new cps_ir_nodes_sexpr.SExpressionStringifier();
-  stringifier
-    ..newContinuationName(null)
-    ..newValueName(null)
-    ..visitConstant(null)
-    ..visitContinuation(null)
-    ..visitDefinition(null)
-    ..visitExpression(null)
-    ..visitFunctionDefinition(null)
-    ..visitFieldDefinition(null)
-    ..visitInvokeStatic(null)
-    ..visitLetCont(null)
-    ..visitNode(null)
-    ..visitParameter(null);
   task
     ..hasIr(null)
     ..getIr(null);
   builder
     ..buildIntegerLiteral(null)
     ..buildDoubleLiteral(null)
     ..buildBooleanLiteral(null)
     ..buildNullLiteral()
     ..buildStringLiteral(null)
     ..buildDynamicGet(null, null);
@@ skipping 16 matching lines @@
 }
 
 useScript(dart2jslib.Script script) {
   script.copyWithFile(null);
 }
 
 useProgramBuilder(program_builder.ProgramBuilder builder) {
   builder.buildMethodHackForIncrementalCompilation(null);
   builder.buildFieldsHackForIncrementalCompilation(null);
 }