Can't use re-exported Key derive macro

[TheDan64]

Not sure if this is an issue with rustc/cargo or if there's a way for fixed_map to solve it, but I'm writing a library that uses a fixed map as input. So I want to re-export the Key derive macro for users of my library to use on their own types:

pub use fixed_map::Key;

This works fine and compiles in the library, however, when trying to use the Key derive type in a crate using my library:

63 | #[derive(Clone, Copy, Debug, Eq, Hash, Ord, PartialEq, PartialOrd, Key)]
   |                                                                    ^^^ could not find `fixed_map` in the list of imported crates
51 | #[derive(Clone, Copy, Debug, Eq, Hash, Ord, PartialEq, PartialOrd, Key)]
   |                                                                    ^^^ not found in `fixed_map::map`

From the sound of it, the error is because the crate using my library doesn't directly use fixed_map as one of it's dependencies? But it seems kinda unfortunate that to use my lib, they also have to explicitly add fixed_map as a dep...

Any ideas if it's possible to get this to work?

[pitaj]

I believe this is currently an unsolved problem in the Rust ecosystem.

[udoprog]

Yeah, two options:

• We add a crate option to the macro, but then users would have to specify that to some point where you re-export internals.
• You write a proc-macro that reuses the internals but is configured to use your crate re-export by default.

None of which are great I'm afraid!