Skip to content

Want good errors when template applied to wrong kind of driver

In several the examples, @nickm proposed define_derive_adhoc!{ Template for struct = ... etc.

I don't much like this because it's extra syntax. But we should have something to do this job, rather than just producing terrible compiler errors. Possibilities:

  • Something like the ... for struct ... syntax
  • Ask the template author to write ${assert is_struct} in the template
  • Somehow detect that the template is probably useless on enums eg if it has no ${v...} expansions mabye? But how to override this?