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16 lines
362 B
Rust
16 lines
362 B
Rust
fn main() {
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let foo = &mut 1;
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let &mut x = foo;
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x += 1; //~ ERROR cannot assign twice to immutable variable `x`
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// explicitly mut-ify internals
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let &mut mut x = foo;
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x += 1;
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// check borrowing is detected successfully
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let &mut ref x = foo;
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*foo += 1; //~ ERROR cannot assign to `*foo` because it is borrowed
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drop(x);
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}
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