Provide a way to figure out why a specific dependency feature is enabled during build

[SludgePhD]

Problem

I'm currently trying to disable a feature in a dependency, but Cargo clearly still enables it (the items it gates are still available; there is no other way Cargo communicates this). I've checked all other crates in my dependency graph that depend on that crate, and none of them seem to enable that feature.

There does not seem to be any way, or at least any documented way, or any third-party subcommand, that can help debug this. This is incredibly frustrating.

Proposed Solution

No response

Notes

No response

[epage]

Try running cargo tree -e features -i <dep>.

If not, rust-lang/rfcs#3553 should have you covered

[SludgePhD]

Thanks, that helped. Is there any way to make this more visible perhaps? I searched the web for a bunch of related queries and -e features has never come up.

[epage]

#12903 expanded the troubleshooting but somehow we overlooked "why is this feature enabled" and would be a good topic to add.

[linyihai]

@rustbot claim

Try running cargo tree -e features -i .

This is a new world for me, too.