mirror of https://github.com/rust-lang/rust
21 lines
380 B
Rust
21 lines
380 B
Rust
// Check that `&mut` objects cannot be borrowed twice, just like
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// other `&mut` pointers.
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trait Foo {
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fn f1(&mut self) -> &();
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fn f2(&mut self);
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}
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fn test(x: &mut dyn Foo) {
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let y = x.f1();
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x.f2(); //~ ERROR cannot borrow `*x` as mutable
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y.use_ref();
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}
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fn main() {}
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trait Fake { fn use_mut(&mut self) { } fn use_ref(&self) { } }
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impl<T> Fake for T { }
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