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try-block-maybe-bad-lifetime.rs
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try-block-maybe-bad-lifetime.rs
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// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
// compile-flags: --edition 2018
#![feature(try_blocks)]
// This test checks that borrows made and returned inside try blocks are properly constrained
pub fn main() {
{
// Test that a borrow which *might* be returned still freezes its referent
let mut i = 222;
let x: Result<&i32, ()> = try {
Err(())?;
&i
};
x.ok().cloned();
i = 0; //~ ERROR cannot assign to `i` because it is borrowed
let _ = i;
}
{
let x = String::new();
let _y: Result<(), ()> = try {
Err(())?;
::std::mem::drop(x);
};
println!("{}", x); //~ ERROR use of moved value: `x`
}
{
// Test that a borrow which *might* be assigned to an outer variable still freezes
// its referent
let mut i = 222;
let j;
let x: Result<(), ()> = try {
Err(())?;
j = &i;
};
i = 0; //~ ERROR cannot assign to `i` because it is borrowed
let _ = i;
}
}