39 lines
648 B
Rust
39 lines
648 B
Rust
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// Test for interaction between #[automatically_derived] attribute used by
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// built-in derives and lints generated by liveness pass.
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//
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// edition:2018
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// check-pass
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#![warn(unused)]
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pub trait T: Sized {
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const N: usize;
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fn t(&self) -> Self;
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}
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impl T for u32 {
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const N: usize = {
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let a = 0; // FIXME should warn about unused variable
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4
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};
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fn t(&self) -> Self {
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let b = 16; //~ WARN unused variable: `b`
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0
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}
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}
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#[automatically_derived]
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impl T for i32 {
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const N: usize = {
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let c = 0;
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4
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};
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fn t(&self) -> Self {
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let d = 17;
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0
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}
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}
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fn main() {}
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