Fasta type inference prototype #2

pkg/front_end/lib/src/fasta/builder/ast_factory.dart

Index: pkg/front_end/lib/src/fasta/builder/ast_factory.dart
diff --git a/pkg/front_end/lib/src/fasta/builder/ast_factory.dart b/pkg/front_end/lib/src/fasta/builder/ast_factory.dart
index 01c63324b98a823c010c99ec89e2580db83b2018..a7fb25121cff4dd2d3c7386985313ed61a90f9aa 100644
--- a/pkg/front_end/lib/src/fasta/builder/ast_factory.dart
+++ b/pkg/front_end/lib/src/fasta/builder/ast_factory.dart
@@ -38,6 +38,10 @@ abstract class AstFactory {
   /// Creates a statement block.
   ShadowBlock block(List<ShadowStatement> statements, int charOffset);
 
+  /// Note: needed because some kernel constructors require us to pass in a
+  /// List<Expression>.
+  List<ShadowExpression> expressionList(int length);
+
   /// Creates an integer literal.
   ShadowIntLiteral intLiteral(value, int charOffset);