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https://github.com/rust-lang/rust
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14 lines
276 B
Rust
14 lines
276 B
Rust
use std::cell::RefCell;
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fn main() {
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let m = RefCell::new(0);
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let mut b = m.borrow_mut();
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let b1 = &mut *b;
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let b2 = &mut *b; //~ ERROR cannot borrow
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b1.use_mut();
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}
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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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