rust/tests/ui/closures/2229_closure_analysis/diagnostics/cant-mutate-imm-borrow.rs
2023-01-11 09:32:08 +00:00

20 lines
519 B
Rust

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