Convert closures in all initializers, and share the context between them.

pkg/kernel/lib/transformations/argument_extraction.dart

+// Copyright (c) 2017, 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 kernel.transformations.argument_extraction_for_redirecting;
+
+import '../ast.dart'
+    show
+        Constructor,
+        FieldInitializer,
+        Initializer,
+        Library,
+        LocalInitializer,
+        Program,
+        VariableDeclaration,
+        VariableGet;
+import '../core_types.dart' show CoreTypes;
+import '../visitor.dart' show Transformer;
+
+Program transformProgram(CoreTypes coreTypes, Program program) {
+  new ArgumentExtractionForRedirecting().visitProgram(program);
+  return program;
+}
+
+void transformLibraries(CoreTypes coreTypes, List<Library> libraries) {
+  var transformer = new ArgumentExtractionForRedirecting();
+  for (var library in libraries) {
+    transformer.visitLibrary(library);
+  }
+}
+
+class ArgumentExtractionForRedirecting extends Transformer {

[Dmitry Stefantsov, 2017/07/14 00:34:17]

Please, see the comments for argument_extraction_for_redirecting.dart.  They
apply to this class as well.

[sjindel, 2017/07/14 08:49:45]

I meant to delete this file.

+  visitConstructor(Constructor node) {
+    var newInits = <Initializer>[];
+
+    int i = 0;
+    for (var fi in node.initializers) {
+      if (fi is FieldInitializer) {
+        if (!fi.field.name.name.endsWith("_li")) {
+          newInits.add(fi);
+          continue;
+        }
+
+        // Move the body of the initializer to a new local initializer, and
+        // eta-expand the reference to the local initializer in the body of the
+        // field initializer.
+
+        var value = fi.value;
+
+        var decl = new VariableDeclaration('#li_$i');
+        decl.initializer = value;
+        var li = new LocalInitializer(decl);
+        li.parent = node;
+        newInits.add(li);
+
+        fi.value = new VariableGet(decl);
+        fi.value.parent = fi;
+
+        ++i;
+        newInits.add(fi);
+      } else {
+        newInits.add(fi);
+      }
+    }
+
+    node.initializers = newInits;
+    return super.visitConstructor(node);
+  }
+}