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Diffstat (limited to '')
-rw-r--r-- | src/test/ui/nll/drop-no-may-dangle.rs | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/src/test/ui/nll/drop-no-may-dangle.rs b/src/test/ui/nll/drop-no-may-dangle.rs new file mode 100644 index 000000000..a0ff0c398 --- /dev/null +++ b/src/test/ui/nll/drop-no-may-dangle.rs @@ -0,0 +1,30 @@ +// Basic test for liveness constraints: the region (`R1`) that appears +// in the type of `p` must include everything until `p` is dropped +// because of destructor. (Note that the stderr also identifies this +// destructor in the error message.) + +#![allow(warnings)] +#![feature(dropck_eyepatch)] + +fn use_x(_: usize) -> bool { true } + +fn main() { + let mut v = [1, 2, 3]; + let p: WrapMayNotDangle<&usize> = WrapMayNotDangle { value: &v[0] }; + if true { + use_x(*p.value); + } else { + use_x(22); + v[0] += 1; //~ ERROR cannot assign to `v[_]` because it is borrowed + } + + v[0] += 1; //~ ERROR cannot assign to `v[_]` because it is borrowed +} + +struct WrapMayNotDangle<T> { + value: T +} + +impl<T> Drop for WrapMayNotDangle<T> { + fn drop(&mut self) { } +} |