93 lines
2.4 KiB
Rust
93 lines
2.4 KiB
Rust
#![allow(
|
|
clippy::map_unwrap_or,
|
|
clippy::needless_lifetimes,
|
|
clippy::uninlined_format_args
|
|
)]
|
|
|
|
use syn::punctuated::{Pair, Punctuated};
|
|
use syn::{parse_quote, GenericParam, Generics, Lifetime, LifetimeParam, 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;
|
|
}
|
|
}
|
|
}
|
|
|
|
// Regression test for https://github.com/dtolnay/syn/issues/1718
|
|
#[test]
|
|
fn no_opaque_drop() {
|
|
let mut generics = Generics::default();
|
|
|
|
let _ = generics
|
|
.lifetimes()
|
|
.next()
|
|
.map(|param| param.lifetime.clone())
|
|
.unwrap_or_else(|| {
|
|
let lifetime: Lifetime = parse_quote!('a);
|
|
generics.params.insert(
|
|
0,
|
|
GenericParam::Lifetime(LifetimeParam::new(lifetime.clone())),
|
|
);
|
|
lifetime
|
|
});
|
|
}
|