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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/hygiene/hygienic-labels.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/hygiene/hygienic-labels.rs')
-rw-r--r-- | src/test/ui/hygiene/hygienic-labels.rs | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/src/test/ui/hygiene/hygienic-labels.rs b/src/test/ui/hygiene/hygienic-labels.rs new file mode 100644 index 000000000..6a7d81f04 --- /dev/null +++ b/src/test/ui/hygiene/hygienic-labels.rs @@ -0,0 +1,60 @@ +// run-pass +#![allow(unreachable_code)] +#![allow(unused_labels)] +// Test that labels injected by macros do not break hygiene. + +// Issue #24278: The label/lifetime shadowing checker from #24162 +// conservatively ignores hygiene, and thus issues warnings that are +// both true- and false-positives for this test. + +macro_rules! loop_x { + ($e: expr) => { + // $e shouldn't be able to interact with this 'x + 'x: loop { + $e + } + }; +} + +macro_rules! run_once { + ($e: expr) => { + // ditto + 'x: for _ in 0..1 { + $e + } + }; +} + +macro_rules! while_x { + ($e: expr) => { + // ditto + 'x: while 1 + 1 == 2 { + $e + } + }; +} + +pub fn main() { + 'x: for _ in 0..1 { + // this 'x should refer to the outer loop, lexically + loop_x!(break 'x); + panic!("break doesn't act hygienically inside for loop"); + } + + 'x: loop { + // ditto + loop_x!(break 'x); + panic!("break doesn't act hygienically inside infinite loop"); + } + + 'x: while 1 + 1 == 2 { + while_x!(break 'x); + panic!("break doesn't act hygienically inside infinite while loop"); + } + + 'x: for _ in 0..1 { + // ditto + run_once!(continue 'x); + panic!("continue doesn't act hygienically inside for loop"); + } +} |