diff -r 08c2d80428ff -r 3ebf9f8299df src/Tools/VSCode/src/vscode_resources.scala
--- a/src/Tools/VSCode/src/vscode_resources.scala	Thu Dec 29 22:10:29 2016 +0100
+++ b/src/Tools/VSCode/src/vscode_resources.scala	Fri Dec 30 10:26:10 2016 +0100
@@ -35,6 +35,7 @@
 
 class VSCode_Resources(
     val options: Options,
+    val text_length: Text.Length,
     loaded_theories: Set[String],
     known_theories: Map[String, Document.Node.Name],
     base_syntax: Outer_Syntax)