78 lines
1.6 KiB
Rust
78 lines
1.6 KiB
Rust
//@run-rustfix
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#![allow(unused)]
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#![warn(clippy::unnecessary_struct_initialization)]
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struct S {
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f: String,
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}
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#[derive(Clone, Copy)]
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struct T {
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f: u32,
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}
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struct U {
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f: u32,
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}
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impl Clone for U {
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fn clone(&self) -> Self {
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// Do not lint: `Self` does not implement `Copy`
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Self { ..*self }
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}
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}
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#[derive(Copy)]
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struct V {
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f: u32,
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}
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impl Clone for V {
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fn clone(&self) -> Self {
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// Lint: `Self` implements `Copy`
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Self { ..*self }
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}
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}
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fn main() {
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// Should lint: `a` would be consumed anyway
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let a = S { f: String::from("foo") };
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let mut b = S { ..a };
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// Should lint: `b` would be consumed, and is mutable
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let c = &mut S { ..b };
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// Should not lint as `d` is not mutable
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let d = S { f: String::from("foo") };
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let e = &mut S { ..d };
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// Should lint as `f` would be consumed anyway
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let f = S { f: String::from("foo") };
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let g = &S { ..f };
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// Should lint: the result of an expression is mutable
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let h = &mut S {
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..*Box::new(S { f: String::from("foo") })
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};
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// Should not lint: `m` would be both alive and borrowed
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let m = T { f: 17 };
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let n = &T { ..m };
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// Should not lint: `m` should not be modified
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let o = &mut T { ..m };
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o.f = 32;
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assert_eq!(m.f, 17);
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// Should not lint: `m` should not be modified
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let o = &mut T { ..m } as *mut T;
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unsafe { &mut *o }.f = 32;
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assert_eq!(m.f, 17);
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// Should lint: the result of an expression is mutable and temporary
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let p = &mut T {
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..*Box::new(T { f: 5 })
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};
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}
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