Fasta type inference prototype #2

pkg/front_end/lib/src/fasta/kernel/kernel_ast_factory.dart

Index: pkg/front_end/lib/src/fasta/kernel/kernel_ast_factory.dart
diff --git a/pkg/front_end/lib/src/fasta/kernel/kernel_ast_factory.dart b/pkg/front_end/lib/src/fasta/kernel/kernel_ast_factory.dart
index 1a7bdf9d90a3cc0bf0e8674b6fd1cd5e71d7d39a..9789bd3adb1c91d4f34e7647f1587196f7dbf531 100644
--- a/pkg/front_end/lib/src/fasta/kernel/kernel_ast_factory.dart
+++ b/pkg/front_end/lib/src/fasta/kernel/kernel_ast_factory.dart
@@ -16,6 +16,10 @@ class KernelAstFactory implements builder.AstFactory {
   }
 
   @override
+  List<KernelExpression> expressionList(int length) =>
+      new List<KernelExpression>.filled(length, null, growable: true);
+
+  @override
   KernelIntLiteral intLiteral(value, int charOffset) {
     return new KernelIntLiteral(value)..fileOffset = charOffset;
   }