Should structopt re-export paw?

[epage]

clap-verbosity-flag is a crate that provides a reusable set of arguments. When someone tried to use clap-verbosity-flag with paw, it broke:

error[E0433]: failed to resolve: use of undeclared type or module `paw`
  --> /Users/edpage/.cargo/registry/src/github.com-1ecc6299db9ec823/clap-verbosity-flag-0.3.1/src/lib.rs:21:10
   |
21 | #[derive(structopt::StructOpt, Debug, Clone)]
   |          ^^^^^^^^^^^^^^^^^^^^ use of undeclared type or module `paw`

error: aborting due to previous error

structopt has the paw feature on but the symbol paw isn't visible within clap-verbosity-flag to be able to compile.

Currently structopt re-exports clap. Should it also re-export paw?

[CreepySkeleton]

I say we can gate the reexport under cfg(feature = "paw"). Will that suffice? (I didn't read the linked issue, sorry)

[CreepySkeleton]

Wait, we can't reexport it because, astonishingly, structopt doesn't depend on in 😮 We just generate some extra code when the paw feature is enabled, and that's about it :)

On the other hand, if the end user of your crate enabled the feature, they depend on paw already, and we can depend on it without extra trouble.

@TeXitoi what do you think about it?

[CreepySkeleton]

Fat chance.

Caused by:
  Features and dependencies cannot have the same name: `paw`

We can't depend on paw because we have a feature named paw, so paw is off-limits dependency for us. We can't rename the feature because it's API contract. We can't just get rid of the feature and rely on the implicit feature the paw dependency would introduce because implicit features cannot enable other features (we need it to enable structopt_derive/paw). If we can't depend on it, we can't reexport it. If we can't reexport it... You get the idea.

I'm afraid this is just unsolvable with no hope on horizon, so I think the only solution is to avoid using the feature. IMHO, it doesn't have any value except giving you warm nostalgic feelings from good old C days when you got the args passed directly to main.

[CreepySkeleton]

I did it!