mirror of https://github.com/rust-lang/rust
84 lines
1.5 KiB
Rust
84 lines
1.5 KiB
Rust
#![allow(unused_variables)]
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#![allow(non_camel_case_types)]
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#![deny(dead_code)]
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struct Foo {
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x: usize,
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b: bool, //~ ERROR: field `b` is never read
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}
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fn field_read(f: Foo) -> usize {
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f.x.pow(2)
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}
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enum XYZ {
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X, //~ ERROR variants `X` and `Y` are never constructed
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Y {
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a: String,
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b: i32,
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c: i32,
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},
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Z
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}
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enum ABC { //~ ERROR enum `ABC` is never used
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A,
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B {
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a: String,
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b: i32,
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c: i32,
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},
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C
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}
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// ensure struct variants get warning for their fields
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enum IJK {
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I, //~ ERROR variants `I` and `K` are never constructed
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J {
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a: String,
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b: i32, //~ ERROR fields `b` and `c` are never read
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c: i32,
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},
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K
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}
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fn struct_variant_partial_use(b: IJK) -> String {
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match b {
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IJK::J { a, b: _, .. } => a,
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_ => "".to_string()
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}
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}
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fn field_match_in_patterns(b: XYZ) -> String {
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match b {
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XYZ::Y { a, b: _, .. } => a,
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_ => "".to_string()
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}
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}
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struct Bar {
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x: usize, //~ ERROR: fields `x` and `c` are never read
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b: bool,
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c: bool,
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_guard: ()
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}
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#[repr(C)]
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struct Baz {
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x: u32,
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}
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fn field_match_in_let(f: Bar) -> bool {
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let Bar { b, c: _, .. } = f;
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b
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}
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fn main() {
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field_read(Foo { x: 1, b: false });
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field_match_in_patterns(XYZ::Z);
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struct_variant_partial_use(IJK::J { a: "".into(), b: 1, c: -1 });
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field_match_in_let(Bar { x: 42, b: true, c: false, _guard: () });
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let _ = Baz { x: 0 };
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}
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