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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/match-cfg-fake-edges.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/nll/match-cfg-fake-edges.rs')
-rw-r--r-- | src/test/ui/nll/match-cfg-fake-edges.rs | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/src/test/ui/nll/match-cfg-fake-edges.rs b/src/test/ui/nll/match-cfg-fake-edges.rs new file mode 100644 index 000000000..252f7f8ba --- /dev/null +++ b/src/test/ui/nll/match-cfg-fake-edges.rs @@ -0,0 +1,42 @@ +// Test that we have enough false edges to avoid exposing the exact matching +// algorithm in borrow checking. + +fn guard_always_precedes_arm(y: i32) { + let mut x; + // x should always be initialized, as the only way to reach the arm is + // through the guard. + match y { + 0 | 2 if { x = 2; true } => x, + _ => 2, + }; +} + +fn guard_may_be_skipped(y: i32) { + let x; + // Even though x *is* always initialized, we don't want to have borrowck + // results be based on whether patterns are exhaustive. + match y { + _ if { x = 2; true } => 1, + _ if { + x; //~ ERROR E0381 + false + } => 2, + _ => 3, + }; +} + +fn guard_may_be_taken(y: bool) { + let x = String::new(); + // Even though x *is* never moved before the use, we don't want to have + // borrowck results be based on whether patterns are disjoint. + match y { + false if { drop(x); true } => 1, + true => { + x; //~ ERROR use of moved value: `x` + 2 + } + false => 3, + }; +} + +fn main() {} |