diff options
Diffstat (limited to '')
-rw-r--r-- | src/test/ui/issues/issue-45697.rs | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/src/test/ui/issues/issue-45697.rs b/src/test/ui/issues/issue-45697.rs new file mode 100644 index 000000000..db6d1d8fa --- /dev/null +++ b/src/test/ui/issues/issue-45697.rs @@ -0,0 +1,25 @@ +// Test that assignments to an `&mut` pointer which is found in a +// borrowed (but otherwise non-aliasable) location is illegal. + +// compile-flags: -C overflow-checks=off + +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` because it was mutably borrowed [E0503] + //~| ERROR cannot assign to `*y.pointer` because it is borrowed [E0506] + *z.pointer += 1; + } +} |