rust/tests/ui/span/destructor-restrictions.rs

// Tests the new destructor semantics.

use std::cell::RefCell;

fn main() {
    let b = {
        let a = Box::new(RefCell::new(4));
        *a.borrow() + 1
    }; //~^ ERROR `*a` does not live long enough
    println!("{}", b);
}
compile-fail tests. Some compile-fail tests illustrated cases to be rejected by dropck, including ones that check cyclic data cases designed to exposed bugs if they are actually tricked into running by an unsound analysis. E.g. these exposed bugs in earlier broken ways of handling `Vec<T>`. (Note that all the uses of `unsafe_destructor` are just placating the simple analysis used for that feature, which will eventually go away once we have put the dropck through its paces.) 2014-10-27 12:58:30 +01:00			`// Tests the new destructor semantics.`

			`use std::cell::RefCell;`

			`fn main() {`
			`let b = {`
Remove integer suffixes where the types in compiled code are identical. 2015-03-03 10:42:26 +02:00			`let a = Box::new(RefCell::new(4));`
Merge cfail and ui tests into ui tests 2017-11-20 13:13:27 +01:00			`*a.borrow() + 1`
Point at var in short lived borrows 2017-12-13 17:27:23 -08:00			}; //~^ ERROR `*a` does not live long enough
compile-fail tests. Some compile-fail tests illustrated cases to be rejected by dropck, including ones that check cyclic data cases designed to exposed bugs if they are actually tricked into running by an unsound analysis. E.g. these exposed bugs in earlier broken ways of handling `Vec<T>`. (Note that all the uses of `unsafe_destructor` are just placating the simple analysis used for that feature, which will eventually go away once we have put the dropck through its paces.) 2014-10-27 12:58:30 +01:00			`println!("{}", b);`
			`}`