Fix try

pkg/dart2js_incremental/lib/library_updater.dart

Index: pkg/dart2js_incremental/lib/library_updater.dart
diff --git a/pkg/dart2js_incremental/lib/library_updater.dart b/pkg/dart2js_incremental/lib/library_updater.dart
index 3499f4f577c7d56c07b74d70dfc19b43f72eec53..2cf99858adbf845f26bb60f4466bb1d4578ef27b 100644
--- a/pkg/dart2js_incremental/lib/library_updater.dart
+++ b/pkg/dart2js_incremental/lib/library_updater.dart
@@ -687,7 +687,7 @@ class LibraryUpdater extends JsFeatures {
       PartialFunctionElement before,
       PartialFunctionElement after) {
     FunctionExpression node =
-        after.parseNode(compiler).asFunctionExpression();
+        after.parseNode(compiler.parsing).asFunctionExpression();
     if (node == null) {
       return cannotReuse(after, "Not a function expression: '$node'");
     }
@@ -709,7 +709,7 @@ class LibraryUpdater extends JsFeatures {
       Token diffToken,
       PartialClassElement before,
       PartialClassElement after) {
-    ClassNode node = after.parseNode(compiler).asClassNode();
+    ClassNode node = after.parseNode(compiler.parsing).asClassNode();
     if (node == null) {
       return cannotReuse(after, "Not a ClassNode: '$node'");
     }