Rust: add upgrade script

Author: redsun82

rust/downgrades/3c1990e7f1da60ff6c53ee4f1ab85e1e7457e325/old.dbscheme

@@ -0,0 +1,2 @@
+description: TODO
+compatibility: backwards

rust/downgrades/3c1990e7f1da60ff6c53ee4f1ab85e1e7457e325/rust.dbscheme

@@ -1,4 +1,3 @@
-// generated by codegen, remove this comment if you wish to edit this file
 /**
  * This module provides a hand-modifiable wrapper around the generated class `ForBinder`.
  *
@@ -12,6 +11,7 @@ private import codeql.rust.elements.internal.generated.ForBinder
  * be referenced directly.
  */
 module Impl {
+  // the following QLdoc is generated: if you need to edit it, do it in the schema file
   /**
    * A for binder, specifying lifetime or type parameters for a closure or a type.
    *
@@ -26,5 +26,7 @@ module Impl {
    * print_any("hello");
    * ```
    */
-  class ForBinder extends Generated::ForBinder { }
+  class ForBinder extends Generated::ForBinder {
+    override string toStringImpl() { result = "for<...>" }
+  }
 }