rust/tests/fail/stacked_borrows/fnentry_invalidation.rs

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// Test that spans displayed in diagnostics identify the function call, not the function
// definition, as the location of invalidation due to FnEntry retag. Technically the FnEntry retag
// occurs inside the function, but what the user wants to know is which call produced the
// invalidation.
fn main() {
let mut x = 0i32;
let z = &mut x as *mut i32;
x.do_bad();
unsafe {
let _oof = *z; //~ ERROR: /read access .* tag does not exist in the borrow stack/
}
}
trait Bad {
fn do_bad(&mut self) {
// who knows
}
}
impl Bad for i32 {}