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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 19:33:14 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 19:33:14 +0000
commit36d22d82aa202bb199967e9512281e9a53db42c9 (patch)
tree105e8c98ddea1c1e4784a60a5a6410fa416be2de /third_party/rust/syn/tests/test_iterators.rs
parentInitial commit. (diff)
downloadfirefox-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.rs68
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
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+++ 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;
+ }
+ }
+}