Cargo Features

just_prim_int has no features set by default.

[dependencies]
just_prim_int = { version = "0.1.1", features = ["marker_trait_attr"] }

resolver | not needed

See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

marker_trait_attr

https://doc.rust-lang.org/beta/unstable-book/language-features/marker-trait-attr.html