71 lines
1.7 KiB
Rust
71 lines
1.7 KiB
Rust
#![allow(clippy::uninlined_format_args)]
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use syn::punctuated::{Pair, Punctuated};
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use syn::Token;
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#[macro_use]
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mod macros;
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macro_rules! check_exact_size_iterator {
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($iter:expr) => {{
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let iter = $iter;
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let size_hint = iter.size_hint();
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let len = iter.len();
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let count = iter.count();
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assert_eq!(len, count);
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assert_eq!(size_hint, (count, Some(count)));
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}};
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}
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#[test]
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fn pairs() {
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let mut p: Punctuated<_, Token![,]> = punctuated!(2, 3, 4);
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check_exact_size_iterator!(p.pairs());
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check_exact_size_iterator!(p.pairs_mut());
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check_exact_size_iterator!(p.into_pairs());
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let mut p: Punctuated<_, Token![,]> = punctuated!(2, 3, 4);
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assert_eq!(p.pairs().next_back().map(Pair::into_value), Some(&4));
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assert_eq!(
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p.pairs_mut().next_back().map(Pair::into_value),
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Some(&mut 4)
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);
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assert_eq!(p.into_pairs().next_back().map(Pair::into_value), Some(4));
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}
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#[test]
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fn iter() {
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let mut p: Punctuated<_, Token![,]> = punctuated!(2, 3, 4);
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check_exact_size_iterator!(p.iter());
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check_exact_size_iterator!(p.iter_mut());
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check_exact_size_iterator!(p.into_iter());
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let mut p: Punctuated<_, Token![,]> = punctuated!(2, 3, 4);
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assert_eq!(p.iter().next_back(), Some(&4));
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assert_eq!(p.iter_mut().next_back(), Some(&mut 4));
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assert_eq!(p.into_iter().next_back(), Some(4));
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}
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#[test]
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fn may_dangle() {
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let p: Punctuated<_, Token![,]> = punctuated!(2, 3, 4);
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for element in &p {
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if *element == 2 {
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drop(p);
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break;
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}
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}
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let mut p: Punctuated<_, Token![,]> = punctuated!(2, 3, 4);
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for element in &mut p {
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if *element == 2 {
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drop(p);
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break;
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}
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}
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}
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