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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:02:58 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:02:58 +0000 |
commit | 698f8c2f01ea549d77d7dc3338a12e04c11057b9 (patch) | |
tree | 173a775858bd501c378080a10dca74132f05bc50 /src/test/ui/nll/polonius/subset-relations.rs | |
parent | Initial commit. (diff) | |
download | rustc-698f8c2f01ea549d77d7dc3338a12e04c11057b9.tar.xz rustc-698f8c2f01ea549d77d7dc3338a12e04c11057b9.zip |
Adding upstream version 1.64.0+dfsg1.upstream/1.64.0+dfsg1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | src/test/ui/nll/polonius/subset-relations.rs | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/src/test/ui/nll/polonius/subset-relations.rs b/src/test/ui/nll/polonius/subset-relations.rs new file mode 100644 index 000000000..f223ab177 --- /dev/null +++ b/src/test/ui/nll/polonius/subset-relations.rs @@ -0,0 +1,29 @@ +// Checks that Polonius can compute cases of universal regions errors: +// "illegal subset relation errors", cases where analysis finds that +// two free regions outlive each other, without any evidence that this +// relation holds. + +// compile-flags: -Z polonius + +// returning `y` requires that `'b: 'a`, but it's not known to be true +fn missing_subset<'a, 'b>(x: &'a u32, y: &'b u32) -> &'a u32 { + y //~ ERROR +} + +// `'b: 'a` is explicitly declared +fn valid_subset<'a, 'b: 'a>(x: &'a u32, y: &'b u32) -> &'a u32 { + y +} + +// because of `x`, it is implied that `'b: 'a` holds +fn implied_bounds_subset<'a, 'b>(x: &'a &'b mut u32) -> &'a u32 { + x +} + +// `'b: 'a` is declared, and `'a: 'c` is known via implied bounds: +// `'b: 'c` is therefore known to hold transitively +fn transitively_valid_subset<'a, 'b: 'a, 'c>(x: &'c &'a u32, y: &'b u32) -> &'c u32 { + y +} + +fn main() {} |