Rust: implement Crate::toString

Author: aibaars

rust/ql/.generated.list

@@ -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 `Crate`.
  *
@@ -12,5 +11,9 @@ private import codeql.rust.elements.internal.generated.Crate
  * be referenced directly.
  */
 module Impl {
-  class Crate extends Generated::Crate { }
+  class Crate extends Generated::Crate {
+    override string toString() {
+      result = "Crate(" + this.getName() + "@" + concat(this.getVersion()) + ")"
+    }
+  }
 }