message: Rename _context to _eval
  Summary: Consistency
diff: @@ -170,7 +170,7 @@ impl<'v> EnumType<'v> {
  // We want to get the value of `me` into the function, but that doesn't work since it
  // might move between threads - so we create the NativeFunction and apply it later.
  NativeFunction::new(
  - move |_context, mut param_parser: ParametersParser| {
  + move |_eval, mut param_parser: ParametersParser| {
  let typ_val = param_parser.next("me")?;
  let val: Value = param_parser.next("value")?;
  let typ = EnumType::from_value(typ_val).unwrap();
  