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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/reassign-ref-mut.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/reassign-ref-mut.rs')
-rw-r--r-- | src/test/ui/reassign-ref-mut.rs | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/src/test/ui/reassign-ref-mut.rs b/src/test/ui/reassign-ref-mut.rs new file mode 100644 index 000000000..d6d41e959 --- /dev/null +++ b/src/test/ui/reassign-ref-mut.rs @@ -0,0 +1,16 @@ +// Tests how we behave when the user attempts to mutate an immutable +// binding that was introduced by either `ref` or `ref mut` +// patterns. +// +// Such bindings cannot be made mutable via the mere addition of the +// `mut` keyword, and thus we want to check that the compiler does not +// suggest doing so. + +fn main() { + let (mut one_two, mut three_four) = ((1, 2), (3, 4)); + let &mut (ref a, ref mut b) = &mut one_two; + a = &three_four.0; + //~^ ERROR cannot assign twice to immutable variable `a` [E0384] + b = &mut three_four.1; + //~^ ERROR cannot assign twice to immutable variable `b` [E0384] +} |