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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/borrowck/borrowck-anon-fields-variant.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 'src/test/ui/borrowck/borrowck-anon-fields-variant.rs')
-rw-r--r-- | src/test/ui/borrowck/borrowck-anon-fields-variant.rs | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/src/test/ui/borrowck/borrowck-anon-fields-variant.rs b/src/test/ui/borrowck/borrowck-anon-fields-variant.rs new file mode 100644 index 000000000..6e63de913 --- /dev/null +++ b/src/test/ui/borrowck/borrowck-anon-fields-variant.rs @@ -0,0 +1,46 @@ +enum Foo { + X, Y(usize, usize) +} + +fn distinct_variant() { + let mut y = Foo::Y(1, 2); + + let a = match y { + Foo::Y(ref mut a, _) => a, + Foo::X => panic!() + }; + + // While `a` and `b` are disjoint, borrowck doesn't know that `a` is not + // also used for the discriminant of `Foo`, which it would be if `a` was a + // reference. + let b = match y { + //~^ ERROR cannot use `y` + Foo::Y(_, ref mut b) => b, + Foo::X => panic!() + }; + + *a += 1; + *b += 1; +} + +fn same_variant() { + let mut y = Foo::Y(1, 2); + + let a = match y { + Foo::Y(ref mut a, _) => a, + Foo::X => panic!() + }; + + let b = match y { + //~^ ERROR cannot use `y` + Foo::Y(ref mut b, _) => b, + //~^ ERROR cannot borrow `y.0` as mutable + Foo::X => panic!() + }; + + *a += 1; + *b += 1; +} + +fn main() { +} |