diff options
Diffstat (limited to 'tests/ui/borrowck/borrowck-assign-to-andmut-in-borrowed-loc.rs')
-rw-r--r-- | tests/ui/borrowck/borrowck-assign-to-andmut-in-borrowed-loc.rs | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/tests/ui/borrowck/borrowck-assign-to-andmut-in-borrowed-loc.rs b/tests/ui/borrowck/borrowck-assign-to-andmut-in-borrowed-loc.rs new file mode 100644 index 000000000..f7aee2b8a --- /dev/null +++ b/tests/ui/borrowck/borrowck-assign-to-andmut-in-borrowed-loc.rs @@ -0,0 +1,23 @@ +// Test that assignments to an `&mut` pointer which is found in a +// borrowed (but otherwise non-aliasable) location is illegal. + +struct S<'a> { + pointer: &'a mut isize +} + +fn copy_borrowed_ptr<'a>(p: &'a mut S<'a>) -> S<'a> { + S { pointer: &mut *p.pointer } +} + +fn main() { + let mut x = 1; + + { + let mut y = S { pointer: &mut x }; + let z = copy_borrowed_ptr(&mut y); + *y.pointer += 1; + //~^ ERROR cannot use `*y.pointer` + //~| ERROR cannot assign to `*y.pointer` + *z.pointer += 1; + } +} |