mirror of https://github.com/rust-lang/rust
47 lines
1.2 KiB
Rust
47 lines
1.2 KiB
Rust
#![deny(dead_code)]
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//~^ NOTE: the lint level is defined here
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use std::marker::PhantomData;
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const LEN: usize = 4;
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struct UnusedAtTheEnd(i32, f32, [u8; LEN], String, u8);
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//~^ ERROR:fields `1`, `2`, `3`, and `4` are never read
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//~| NOTE: fields in this struct
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//~| HELP: consider removing these fields
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struct UnusedJustOneField(i32);
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//~^ ERROR: field `0` is never read
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//~| NOTE: field in this struct
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//~| HELP: consider removing this field
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struct UnusedInTheMiddle(i32, f32, String, u8, u32);
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//~^ ERROR: fields `1`, `2`, and `4` are never read
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//~| NOTE: fields in this struct
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//~| HELP: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
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struct GoodUnit(());
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struct GoodPhantom(PhantomData<i32>);
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struct Void;
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struct GoodVoid(Void);
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fn main() {
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let u1 = UnusedAtTheEnd(42, 3.14, [0, 1, 2, 3], "def".to_string(), 4u8);
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let _ = u1.0;
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let _ = UnusedJustOneField(42);
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let u2 = UnusedInTheMiddle(42, 3.14, "def".to_string(), 4u8, 5);
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let _ = u2.0;
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let _ = u2.3;
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let gu = GoodUnit(());
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let gp = GoodPhantom(PhantomData);
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let gv = GoodVoid(Void);
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let _ = (gu, gp, gv);
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}
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