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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/match/match-ref-mut-stability.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/match/match-ref-mut-stability.rs')
-rw-r--r-- | src/test/ui/match/match-ref-mut-stability.rs | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/src/test/ui/match/match-ref-mut-stability.rs b/src/test/ui/match/match-ref-mut-stability.rs new file mode 100644 index 000000000..52120360b --- /dev/null +++ b/src/test/ui/match/match-ref-mut-stability.rs @@ -0,0 +1,37 @@ +// Check that `ref mut` variables don't change address between the match guard +// and the arm expression. + +// run-pass + +// Test that z always point to the same temporary. +fn referent_stability() { + let p; + match 0 { + ref mut z if { p = z as *const _; true } => assert_eq!(p, z as *const _), + _ => unreachable!(), + }; +} + +// Test that z is always effectively the same variable. +fn variable_stability() { + let p; + match 0 { + ref mut z if { p = &z as *const _; true } => assert_eq!(p, &z as *const _), + _ => unreachable!(), + }; +} + +// Test that a borrow of *z can cross from the guard to the arm. +fn persist_borrow() { + let r; + match 0 { + ref mut z if { r = z as &_; true } => assert_eq!(*r, 0), + _ => unreachable!(), + } +} + +fn main() { + referent_stability(); + variable_stability(); + persist_borrow(); +} |