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travis-ci pointed out that building with 1.21 broke with a recent dep
upgrade (8c52c36). reffers now uses nested groups of imports, which is a
feature introduced with Rust 1.25. Prior to 1.25, it fails as follows:
error: expected one of `,` or `as`, found `::`
--> /home/travis/.cargo/git/checkouts/reffers-rs-0d00fc7f893338b3/49a4d75/src/arc.rs:6:46
|
6 | use std::sync::atomic::{AtomicUsize, Ordering::SeqCst};
| ^^ expected one of `,` or `as` here