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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/overloaded/overloaded_deref_with_ref_pattern.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/overloaded/overloaded_deref_with_ref_pattern.rs | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/src/test/ui/overloaded/overloaded_deref_with_ref_pattern.rs b/src/test/ui/overloaded/overloaded_deref_with_ref_pattern.rs new file mode 100644 index 000000000..c87ba6a02 --- /dev/null +++ b/src/test/ui/overloaded/overloaded_deref_with_ref_pattern.rs @@ -0,0 +1,95 @@ +// run-pass +#![allow(unused_mut)] +#![allow(unused_variables)] +// Test that we choose Deref or DerefMut appropriately based on mutability of ref bindings (#15609). + +use std::ops::{Deref, DerefMut}; + +struct DerefOk<T>(T); +struct DerefMutOk<T>(T); + +impl<T> Deref for DerefOk<T> { + type Target = T; + fn deref(&self) -> &Self::Target { + &self.0 + } +} + +impl<T> DerefMut for DerefOk<T> { + fn deref_mut(&mut self) -> &mut Self::Target { + panic!() + } +} + +impl<T> Deref for DerefMutOk<T> { + type Target = T; + fn deref(&self) -> &Self::Target { + panic!() + } +} + +impl<T> DerefMut for DerefMutOk<T> { + fn deref_mut(&mut self) -> &mut Self::Target { + &mut self.0 + } +} + +fn main() { + // Check that mutable ref binding in match picks DerefMut + let mut b = DerefMutOk(0); + match *b { + ref mut n => n, + }; + + // Check that mutable ref binding in let picks DerefMut + let mut y = DerefMutOk(1); + let ref mut z = *y; + + // Check that immutable ref binding in match picks Deref + let mut b = DerefOk(2); + match *b { + ref n => n, + }; + + // Check that immutable ref binding in let picks Deref + let mut y = DerefOk(3); + let ref z = *y; + + // Check that mixed mutable/immutable ref binding in match picks DerefMut + let mut b = DerefMutOk((0, 9)); + match *b { + (ref mut n, ref m) => (n, m), + }; + + let mut b = DerefMutOk((0, 9)); + match *b { + (ref n, ref mut m) => (n, m), + }; + + // Check that mixed mutable/immutable ref binding in let picks DerefMut + let mut y = DerefMutOk((1, 8)); + let (ref mut z, ref a) = *y; + + let mut y = DerefMutOk((1, 8)); + let (ref z, ref mut a) = *y; + + // Check that multiple immutable ref bindings in match picks Deref + let mut b = DerefOk((2, 7)); + match *b { + (ref n, ref m) => (n, m), + }; + + // Check that multiple immutable ref bindings in let picks Deref + let mut y = DerefOk((3, 6)); + let (ref z, ref a) = *y; + + // Check that multiple mutable ref bindings in match picks DerefMut + let mut b = DerefMutOk((4, 5)); + match *b { + (ref mut n, ref mut m) => (n, m), + }; + + // Check that multiple mutable ref bindings in let picks DerefMut + let mut y = DerefMutOk((5, 4)); + let (ref mut z, ref mut a) = *y; +} |