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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 19:33:14 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 19:33:14 +0000 |
commit | 36d22d82aa202bb199967e9512281e9a53db42c9 (patch) | |
tree | 105e8c98ddea1c1e4784a60a5a6410fa416be2de /third_party/rust/syn/tests/test_iterators.rs | |
parent | Initial commit. (diff) | |
download | firefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.tar.xz firefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.zip |
Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'third_party/rust/syn/tests/test_iterators.rs')
-rw-r--r-- | third_party/rust/syn/tests/test_iterators.rs | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/third_party/rust/syn/tests/test_iterators.rs b/third_party/rust/syn/tests/test_iterators.rs new file mode 100644 index 0000000000..0ab0fb9147 --- /dev/null +++ b/third_party/rust/syn/tests/test_iterators.rs @@ -0,0 +1,68 @@ +use syn::punctuated::{Pair, Punctuated}; +use syn::Token; + +#[macro_use] +mod macros; + +macro_rules! check_exact_size_iterator { + ($iter:expr) => {{ + let iter = $iter; + let size_hint = iter.size_hint(); + let len = iter.len(); + let count = iter.count(); + assert_eq!(len, count); + assert_eq!(size_hint, (count, Some(count))); + }}; +} + +#[test] +fn pairs() { + let mut p: Punctuated<_, Token![,]> = punctuated!(2, 3, 4); + + check_exact_size_iterator!(p.pairs()); + check_exact_size_iterator!(p.pairs_mut()); + check_exact_size_iterator!(p.into_pairs()); + + let mut p: Punctuated<_, Token![,]> = punctuated!(2, 3, 4); + + assert_eq!(p.pairs().next_back().map(Pair::into_value), Some(&4)); + assert_eq!( + p.pairs_mut().next_back().map(Pair::into_value), + Some(&mut 4) + ); + assert_eq!(p.into_pairs().next_back().map(Pair::into_value), Some(4)); +} + +#[test] +fn iter() { + let mut p: Punctuated<_, Token![,]> = punctuated!(2, 3, 4); + + check_exact_size_iterator!(p.iter()); + check_exact_size_iterator!(p.iter_mut()); + check_exact_size_iterator!(p.into_iter()); + + let mut p: Punctuated<_, Token![,]> = punctuated!(2, 3, 4); + + assert_eq!(p.iter().next_back(), Some(&4)); + assert_eq!(p.iter_mut().next_back(), Some(&mut 4)); + assert_eq!(p.into_iter().next_back(), Some(4)); +} + +#[test] +fn may_dangle() { + let p: Punctuated<_, Token![,]> = punctuated!(2, 3, 4); + for element in &p { + if *element == 2 { + drop(p); + break; + } + } + + let mut p: Punctuated<_, Token![,]> = punctuated!(2, 3, 4); + for element in &mut p { + if *element == 2 { + drop(p); + break; + } + } +} |