util/list-missing-methods failure

[coke]

% raku -c util/list-missing-methods.raku
===SORRY!=== Error while compiling /Users/coke/sandbox/doc/util/list-missing-methods.raku
Cannot bind to '$native-code' because it was bound in a signature and
variables bound in signatures cannot be rebound unless they were
declared with the 'is rw' or 'is copy' traits
at /Users/coke/sandbox/doc/util/list-missing-methods.raku:137
------> code := Bag.new(%methods<native-code><>)⏏;

not sure if this is needed since we have xt/check-signatures.rakutest