37 lines
575 B
Rust
37 lines
575 B
Rust
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#![warn(temporary_assignment)]
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use std::ops::{Deref, DerefMut};
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struct Struct {
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field: i32
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}
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struct Wrapper<'a> {
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inner: &'a mut Struct
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}
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impl<'a> Deref for Wrapper<'a> {
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type Target = Struct;
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fn deref(&self) -> &Struct { self.inner }
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}
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impl<'a> DerefMut for Wrapper<'a> {
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fn deref_mut(&mut self) -> &mut Struct { self.inner }
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}
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fn main() {
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let mut s = Struct { field: 0 };
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let mut t = (0, 0);
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Struct { field: 0 }.field = 1;
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(0, 0).0 = 1;
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// no error
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s.field = 1;
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t.0 = 1;
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Wrapper { inner: &mut s }.field = 1;
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}
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