30862a64c2
This is required by the check-fast target because each test is slurped up into a submodule.
42 lines
969 B
Rust
42 lines
969 B
Rust
// Issue #6272. Tests that freezing correctly accounts for all the
|
|
// implicit derefs that can occur.
|
|
//
|
|
// In this particular case, the expression:
|
|
//
|
|
// let x: &mut [int] = c[0];
|
|
//
|
|
// is seen by borrowck as this sequence of derefs
|
|
// and pointer offsets:
|
|
//
|
|
// &*((**c)[0])
|
|
//
|
|
// or, written using `x.*` for `*x` (so that everything
|
|
// is a postfix operation):
|
|
//
|
|
// &c.*.*.[0].*
|
|
// ^ ^
|
|
// | |
|
|
// b a
|
|
//
|
|
// Here I also indicated where the evaluation yields the boxes `a` and
|
|
// `b`. It is important then that we only freeze the innermost box
|
|
// (`a`), and not the other ones (`b`, `c`).
|
|
//
|
|
// Also see the companion test:
|
|
//
|
|
// run-fail/borrowck-wg-autoderef-and-autoborrowvec-combined-fail-issue-6272.rs
|
|
|
|
|
|
pub fn main() {
|
|
let a = @mut 3i;
|
|
let b = @mut [a];
|
|
let c = @mut [3];
|
|
|
|
// this should freeze `a` only
|
|
let _x: &mut int = a;
|
|
|
|
// hence these writes should not fail:
|
|
b[0] = b[0];
|
|
c[0] = c[0];
|
|
}
|