20 lines
519 B
Rust
20 lines
519 B
Rust
// edition:2021
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// Test that if we deref an immutable borrow to access a Place,
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// then we can't mutate the final place.
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fn main() {
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let mut x = (format!(""), format!("X2"));
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let mut y = (&x, "Y");
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let z = (&mut y, "Z");
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// `x.0` is mutable but we access `x` via `*z.0.0`, which is an immutable reference and
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// therefore can't be mutated.
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let mut c = || {
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//~^ ERROR: cannot borrow `*z.0.0` as mutable, as it is behind a `&` reference
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z.0.0.0 = format!("X1");
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};
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c();
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}
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