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Description
enum Empty {}
struct Unit;
trait Run {
fn run() -> u8;
}
impl Run for Empty {
fn run() -> u8 { 0 }
}
impl Run for Unit {
fn run() -> u8 { 1 }
}
fn main() {
println!("{} {}", Empty::run(), Unit::run());
}
$ rustc -V
rustc 1.3.0-nightly (6d71ce536 2015-07-06)
$ rustc test.rs
test.rs:1:1: 1:14 warning: enum is never used: `Empty`, #[warn(dead_code)] on by default
test.rs:1 enum Empty {}
^~~~~~~~~~~~~
test.rs:2:1: 2:13 warning: struct is never used: `Unit`, #[warn(dead_code)] on by default
test.rs:2 struct Unit;
The same doesn't happen for static methods implemented directly on the types.
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