rust - How do I avoid 'source trait is private' when using subtraits? -

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i'm trying use quickcheck in rust. want define enum instance of arbitrary, can use in tests.

#![feature(plugin)] #![plugin(quickcheck_macros)]  #[cfg(test)] extern crate quickcheck;  use quickcheck::{arbitrary,gen};  #[derive(clone)] enum animal {     cat,     dog,     mouse }  impl arbitrary animal {     fn arbitrary<g: gen>(g: &mut g) -> animal {         let = g.next_u32();         match % 3 {             0 => animal::cat,             1 => animal::dog,             2 => animal::mouse,         }     } }

however, gives me compilation error:

src/main.rs:18:17: 18:29 error: source trait private src/main.rs:18         let = g.next_u32();                                ^~~~~~~~~~~~

what causes error? know there's this rust issue since gen imported think call .next_u32.

it looks gen has rand::rng parent trait, above works if add extern crate rand after adding rand = "*" cargo.toml.

[i had remove #[cfg(test)] above quickcheck import]


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