| // FIXME(static_mut_refs): Do not allow `static_mut_refs` lint |
| #![allow(static_mut_refs)] |
| |
| use core::alloc::{Allocator, Layout}; |
| use core::num::NonZero; |
| use core::ptr::NonNull; |
| use core::{assert_eq, assert_ne}; |
| use std::alloc::System; |
| use std::assert_matches::assert_matches; |
| use std::borrow::Cow; |
| use std::cell::Cell; |
| use std::collections::TryReserveErrorKind::*; |
| use std::fmt::Debug; |
| use std::iter::InPlaceIterable; |
| use std::mem::{size_of, swap}; |
| use std::ops::Bound::*; |
| use std::panic::{AssertUnwindSafe, catch_unwind}; |
| use std::rc::Rc; |
| use std::sync::atomic::{AtomicU32, Ordering}; |
| use std::vec::{Drain, IntoIter}; |
| use std::{hint, mem}; |
| |
| struct DropCounter<'a> { |
| count: &'a mut u32, |
| } |
| |
| impl Drop for DropCounter<'_> { |
| fn drop(&mut self) { |
| *self.count += 1; |
| } |
| } |
| |
| #[test] |
| fn test_small_vec_struct() { |
| assert_eq!(size_of::<Vec<u8>>(), size_of::<usize>() * 3); |
| } |
| |
| #[test] |
| fn test_double_drop() { |
| struct TwoVec<T> { |
| x: Vec<T>, |
| y: Vec<T>, |
| } |
| |
| let (mut count_x, mut count_y) = (0, 0); |
| { |
| let mut tv = TwoVec { x: Vec::new(), y: Vec::new() }; |
| tv.x.push(DropCounter { count: &mut count_x }); |
| tv.y.push(DropCounter { count: &mut count_y }); |
| |
| // If Vec had a drop flag, here is where it would be zeroed. |
| // Instead, it should rely on its internal state to prevent |
| // doing anything significant when dropped multiple times. |
| drop(tv.x); |
| |
| // Here tv goes out of scope, tv.y should be dropped, but not tv.x. |
| } |
| |
| assert_eq!(count_x, 1); |
| assert_eq!(count_y, 1); |
| } |
| |
| #[test] |
| fn test_reserve() { |
| let mut v = Vec::new(); |
| assert_eq!(v.capacity(), 0); |
| |
| v.reserve(2); |
| assert!(v.capacity() >= 2); |
| |
| for i in 0..16 { |
| v.push(i); |
| } |
| |
| assert!(v.capacity() >= 16); |
| v.reserve(16); |
| assert!(v.capacity() >= 32); |
| |
| v.push(16); |
| |
| v.reserve(16); |
| assert!(v.capacity() >= 33) |
| } |
| |
| #[test] |
| fn test_zst_capacity() { |
| assert_eq!(Vec::<()>::new().capacity(), usize::MAX); |
| } |
| |
| #[test] |
| fn test_indexing() { |
| let v: Vec<isize> = vec![10, 20]; |
| assert_eq!(v[0], 10); |
| assert_eq!(v[1], 20); |
| let mut x: usize = 0; |
| assert_eq!(v[x], 10); |
| assert_eq!(v[x + 1], 20); |
| x = x + 1; |
| assert_eq!(v[x], 20); |
| assert_eq!(v[x - 1], 10); |
| } |
| |
| #[test] |
| fn test_debug_fmt() { |
| let vec1: Vec<isize> = vec![]; |
| assert_eq!("[]", format!("{:?}", vec1)); |
| |
| let vec2 = vec![0, 1]; |
| assert_eq!("[0, 1]", format!("{:?}", vec2)); |
| |
| let slice: &[isize] = &[4, 5]; |
| assert_eq!("[4, 5]", format!("{slice:?}")); |
| } |
| |
| #[test] |
| fn test_push() { |
| let mut v = vec![]; |
| v.push(1); |
| assert_eq!(v, [1]); |
| v.push(2); |
| assert_eq!(v, [1, 2]); |
| v.push(3); |
| assert_eq!(v, [1, 2, 3]); |
| } |
| |
| #[test] |
| fn test_extend() { |
| let mut v = Vec::new(); |
| let mut w = Vec::new(); |
| |
| v.extend(w.clone()); |
| assert_eq!(v, &[]); |
| |
| v.extend(0..3); |
| for i in 0..3 { |
| w.push(i) |
| } |
| |
| assert_eq!(v, w); |
| |
| v.extend(3..10); |
| for i in 3..10 { |
| w.push(i) |
| } |
| |
| assert_eq!(v, w); |
| |
| v.extend(w.clone()); // specializes to `append` |
| assert!(v.iter().eq(w.iter().chain(w.iter()))); |
| |
| // Zero sized types |
| #[derive(PartialEq, Debug)] |
| struct Foo; |
| |
| let mut a = Vec::new(); |
| let b = vec![Foo, Foo]; |
| |
| a.extend(b); |
| assert_eq!(a, &[Foo, Foo]); |
| |
| // Double drop |
| let mut count_x = 0; |
| { |
| let mut x = Vec::new(); |
| let y = vec![DropCounter { count: &mut count_x }]; |
| x.extend(y); |
| } |
| assert_eq!(count_x, 1); |
| } |
| |
| #[test] |
| fn test_extend_from_slice() { |
| let a: Vec<isize> = vec![1, 2, 3, 4, 5]; |
| let b: Vec<isize> = vec![6, 7, 8, 9, 0]; |
| |
| let mut v: Vec<isize> = a; |
| |
| v.extend_from_slice(&b); |
| |
| assert_eq!(v, [1, 2, 3, 4, 5, 6, 7, 8, 9, 0]); |
| } |
| |
| #[test] |
| fn test_extend_ref() { |
| let mut v = vec![1, 2]; |
| v.extend(&[3, 4, 5]); |
| |
| assert_eq!(v.len(), 5); |
| assert_eq!(v, [1, 2, 3, 4, 5]); |
| |
| let w = vec![6, 7]; |
| v.extend(&w); |
| |
| assert_eq!(v.len(), 7); |
| assert_eq!(v, [1, 2, 3, 4, 5, 6, 7]); |
| } |
| |
| #[test] |
| fn test_slice_from_ref() { |
| let values = vec![1, 2, 3, 4, 5]; |
| let slice = &values[1..3]; |
| |
| assert_eq!(slice, [2, 3]); |
| } |
| |
| #[test] |
| fn test_slice_from_mut() { |
| let mut values = vec![1, 2, 3, 4, 5]; |
| { |
| let slice = &mut values[2..]; |
| assert!(slice == [3, 4, 5]); |
| for p in slice { |
| *p += 2; |
| } |
| } |
| |
| assert!(values == [1, 2, 5, 6, 7]); |
| } |
| |
| #[test] |
| fn test_slice_to_mut() { |
| let mut values = vec![1, 2, 3, 4, 5]; |
| { |
| let slice = &mut values[..2]; |
| assert!(slice == [1, 2]); |
| for p in slice { |
| *p += 1; |
| } |
| } |
| |
| assert!(values == [2, 3, 3, 4, 5]); |
| } |
| |
| #[test] |
| fn test_split_at_mut() { |
| let mut values = vec![1, 2, 3, 4, 5]; |
| { |
| let (left, right) = values.split_at_mut(2); |
| { |
| let left: &[_] = left; |
| assert!(&left[..left.len()] == &[1, 2]); |
| } |
| for p in left { |
| *p += 1; |
| } |
| |
| { |
| let right: &[_] = right; |
| assert!(&right[..right.len()] == &[3, 4, 5]); |
| } |
| for p in right { |
| *p += 2; |
| } |
| } |
| |
| assert_eq!(values, [2, 3, 5, 6, 7]); |
| } |
| |
| #[test] |
| fn test_clone() { |
| let v: Vec<i32> = vec![]; |
| let w = vec![1, 2, 3]; |
| |
| assert_eq!(v, v.clone()); |
| |
| let z = w.clone(); |
| assert_eq!(w, z); |
| // they should be disjoint in memory. |
| assert!(w.as_ptr() != z.as_ptr()) |
| } |
| |
| #[test] |
| fn test_clone_from() { |
| let mut v = vec![]; |
| let three: Vec<Box<_>> = vec![Box::new(1), Box::new(2), Box::new(3)]; |
| let two: Vec<Box<_>> = vec![Box::new(4), Box::new(5)]; |
| // zero, long |
| v.clone_from(&three); |
| assert_eq!(v, three); |
| |
| // equal |
| v.clone_from(&three); |
| assert_eq!(v, three); |
| |
| // long, short |
| v.clone_from(&two); |
| assert_eq!(v, two); |
| |
| // short, long |
| v.clone_from(&three); |
| assert_eq!(v, three) |
| } |
| |
| #[test] |
| fn test_retain() { |
| let mut vec = vec![1, 2, 3, 4]; |
| vec.retain(|&x| x % 2 == 0); |
| assert_eq!(vec, [2, 4]); |
| } |
| |
| #[test] |
| fn test_retain_predicate_order() { |
| for to_keep in [true, false] { |
| let mut number_of_executions = 0; |
| let mut vec = vec![1, 2, 3, 4]; |
| let mut next_expected = 1; |
| vec.retain(|&x| { |
| assert_eq!(next_expected, x); |
| next_expected += 1; |
| number_of_executions += 1; |
| to_keep |
| }); |
| assert_eq!(number_of_executions, 4); |
| } |
| } |
| |
| #[test] |
| #[cfg_attr(not(panic = "unwind"), ignore = "test requires unwinding support")] |
| fn test_retain_pred_panic_with_hole() { |
| let v = (0..5).map(Rc::new).collect::<Vec<_>>(); |
| catch_unwind(AssertUnwindSafe(|| { |
| let mut v = v.clone(); |
| v.retain(|r| match **r { |
| 0 => true, |
| 1 => false, |
| 2 => true, |
| _ => panic!(), |
| }); |
| })) |
| .unwrap_err(); |
| // Everything is dropped when predicate panicked. |
| assert!(v.iter().all(|r| Rc::strong_count(r) == 1)); |
| } |
| |
| #[test] |
| #[cfg_attr(not(panic = "unwind"), ignore = "test requires unwinding support")] |
| fn test_retain_pred_panic_no_hole() { |
| let v = (0..5).map(Rc::new).collect::<Vec<_>>(); |
| catch_unwind(AssertUnwindSafe(|| { |
| let mut v = v.clone(); |
| v.retain(|r| match **r { |
| 0 | 1 | 2 => true, |
| _ => panic!(), |
| }); |
| })) |
| .unwrap_err(); |
| // Everything is dropped when predicate panicked. |
| assert!(v.iter().all(|r| Rc::strong_count(r) == 1)); |
| } |
| |
| #[test] |
| #[cfg_attr(not(panic = "unwind"), ignore = "test requires unwinding support")] |
| fn test_retain_drop_panic() { |
| struct Wrap(Rc<i32>); |
| |
| impl Drop for Wrap { |
| fn drop(&mut self) { |
| if *self.0 == 3 { |
| panic!(); |
| } |
| } |
| } |
| |
| let v = (0..5).map(|x| Rc::new(x)).collect::<Vec<_>>(); |
| catch_unwind(AssertUnwindSafe(|| { |
| let mut v = v.iter().map(|r| Wrap(r.clone())).collect::<Vec<_>>(); |
| v.retain(|w| match *w.0 { |
| 0 => true, |
| 1 => false, |
| 2 => true, |
| 3 => false, // Drop panic. |
| _ => true, |
| }); |
| })) |
| .unwrap_err(); |
| // Other elements are dropped when `drop` of one element panicked. |
| // The panicked wrapper also has its Rc dropped. |
| assert!(v.iter().all(|r| Rc::strong_count(r) == 1)); |
| } |
| |
| #[test] |
| fn test_retain_maybeuninits() { |
| // This test aimed to be run under miri. |
| use core::mem::MaybeUninit; |
| let mut vec: Vec<_> = [1i32, 2, 3, 4].map(|v| MaybeUninit::new(vec![v])).into(); |
| vec.retain(|x| { |
| // SAFETY: Retain must visit every element of Vec in original order and exactly once. |
| // Our values is initialized at creation of Vec. |
| let v = unsafe { x.assume_init_ref()[0] }; |
| if v & 1 == 0 { |
| return true; |
| } |
| // SAFETY: Value is initialized. |
| // Value wouldn't be dropped by `Vec::retain` |
| // because `MaybeUninit` doesn't drop content. |
| drop(unsafe { x.assume_init_read() }); |
| false |
| }); |
| let vec: Vec<i32> = vec |
| .into_iter() |
| .map(|x| unsafe { |
| // SAFETY: All values dropped in retain predicate must be removed by `Vec::retain`. |
| // Remaining values are initialized. |
| x.assume_init()[0] |
| }) |
| .collect(); |
| assert_eq!(vec, [2, 4]); |
| } |
| |
| #[test] |
| fn test_dedup() { |
| fn case(a: Vec<i32>, b: Vec<i32>) { |
| let mut v = a; |
| v.dedup(); |
| assert_eq!(v, b); |
| } |
| case(vec![], vec![]); |
| case(vec![1], vec![1]); |
| case(vec![1, 1], vec![1]); |
| case(vec![1, 2, 3], vec![1, 2, 3]); |
| case(vec![1, 1, 2, 3], vec![1, 2, 3]); |
| case(vec![1, 2, 2, 3], vec![1, 2, 3]); |
| case(vec![1, 2, 3, 3], vec![1, 2, 3]); |
| case(vec![1, 1, 2, 2, 2, 3, 3], vec![1, 2, 3]); |
| } |
| |
| #[test] |
| fn test_dedup_by_key() { |
| fn case(a: Vec<i32>, b: Vec<i32>) { |
| let mut v = a; |
| v.dedup_by_key(|i| *i / 10); |
| assert_eq!(v, b); |
| } |
| case(vec![], vec![]); |
| case(vec![10], vec![10]); |
| case(vec![10, 11], vec![10]); |
| case(vec![10, 20, 30], vec![10, 20, 30]); |
| case(vec![10, 11, 20, 30], vec![10, 20, 30]); |
| case(vec![10, 20, 21, 30], vec![10, 20, 30]); |
| case(vec![10, 20, 30, 31], vec![10, 20, 30]); |
| case(vec![10, 11, 20, 21, 22, 30, 31], vec![10, 20, 30]); |
| } |
| |
| #[test] |
| fn test_dedup_by() { |
| let mut vec = vec!["foo", "bar", "Bar", "baz", "bar"]; |
| vec.dedup_by(|a, b| a.eq_ignore_ascii_case(b)); |
| |
| assert_eq!(vec, ["foo", "bar", "baz", "bar"]); |
| |
| let mut vec = vec![("foo", 1), ("foo", 2), ("bar", 3), ("bar", 4), ("bar", 5)]; |
| vec.dedup_by(|a, b| { |
| a.0 == b.0 && { |
| b.1 += a.1; |
| true |
| } |
| }); |
| |
| assert_eq!(vec, [("foo", 3), ("bar", 12)]); |
| } |
| |
| #[test] |
| fn test_dedup_unique() { |
| let mut v0: Vec<Box<_>> = vec![Box::new(1), Box::new(1), Box::new(2), Box::new(3)]; |
| v0.dedup(); |
| let mut v1: Vec<Box<_>> = vec![Box::new(1), Box::new(2), Box::new(2), Box::new(3)]; |
| v1.dedup(); |
| let mut v2: Vec<Box<_>> = vec![Box::new(1), Box::new(2), Box::new(3), Box::new(3)]; |
| v2.dedup(); |
| // If the boxed pointers were leaked or otherwise misused, valgrind |
| // and/or rt should raise errors. |
| } |
| |
| #[test] |
| fn zero_sized_values() { |
| let mut v = Vec::new(); |
| assert_eq!(v.len(), 0); |
| v.push(()); |
| assert_eq!(v.len(), 1); |
| v.push(()); |
| assert_eq!(v.len(), 2); |
| assert_eq!(v.pop(), Some(())); |
| assert_eq!(v.pop(), Some(())); |
| assert_eq!(v.pop(), None); |
| |
| assert_eq!(v.iter().count(), 0); |
| v.push(()); |
| assert_eq!(v.iter().count(), 1); |
| v.push(()); |
| assert_eq!(v.iter().count(), 2); |
| |
| for &() in &v {} |
| |
| assert_eq!(v.iter_mut().count(), 2); |
| v.push(()); |
| assert_eq!(v.iter_mut().count(), 3); |
| v.push(()); |
| assert_eq!(v.iter_mut().count(), 4); |
| |
| for &mut () in &mut v {} |
| unsafe { |
| v.set_len(0); |
| } |
| assert_eq!(v.iter_mut().count(), 0); |
| } |
| |
| #[test] |
| fn test_partition() { |
| assert_eq!([].into_iter().partition(|x: &i32| *x < 3), (vec![], vec![])); |
| assert_eq!([1, 2, 3].into_iter().partition(|x| *x < 4), (vec![1, 2, 3], vec![])); |
| assert_eq!([1, 2, 3].into_iter().partition(|x| *x < 2), (vec![1], vec![2, 3])); |
| assert_eq!([1, 2, 3].into_iter().partition(|x| *x < 0), (vec![], vec![1, 2, 3])); |
| } |
| |
| #[test] |
| fn test_zip_unzip() { |
| let z1 = vec![(1, 4), (2, 5), (3, 6)]; |
| |
| let (left, right): (Vec<_>, Vec<_>) = z1.iter().cloned().unzip(); |
| |
| assert_eq!((1, 4), (left[0], right[0])); |
| assert_eq!((2, 5), (left[1], right[1])); |
| assert_eq!((3, 6), (left[2], right[2])); |
| } |
| |
| #[test] |
| fn test_cmp() { |
| let x: &[isize] = &[1, 2, 3, 4, 5]; |
| let cmp: &[isize] = &[1, 2, 3, 4, 5]; |
| assert_eq!(&x[..], cmp); |
| let cmp: &[isize] = &[3, 4, 5]; |
| assert_eq!(&x[2..], cmp); |
| let cmp: &[isize] = &[1, 2, 3]; |
| assert_eq!(&x[..3], cmp); |
| let cmp: &[isize] = &[2, 3, 4]; |
| assert_eq!(&x[1..4], cmp); |
| |
| let x: Vec<isize> = vec![1, 2, 3, 4, 5]; |
| let cmp: &[isize] = &[1, 2, 3, 4, 5]; |
| assert_eq!(&x[..], cmp); |
| let cmp: &[isize] = &[3, 4, 5]; |
| assert_eq!(&x[2..], cmp); |
| let cmp: &[isize] = &[1, 2, 3]; |
| assert_eq!(&x[..3], cmp); |
| let cmp: &[isize] = &[2, 3, 4]; |
| assert_eq!(&x[1..4], cmp); |
| } |
| |
| #[test] |
| fn test_vec_truncate_drop() { |
| static mut DROPS: u32 = 0; |
| struct Elem(#[allow(dead_code)] i32); |
| impl Drop for Elem { |
| fn drop(&mut self) { |
| unsafe { |
| DROPS += 1; |
| } |
| } |
| } |
| |
| let mut v = vec![Elem(1), Elem(2), Elem(3), Elem(4), Elem(5)]; |
| assert_eq!(unsafe { DROPS }, 0); |
| v.truncate(3); |
| assert_eq!(unsafe { DROPS }, 2); |
| v.truncate(0); |
| assert_eq!(unsafe { DROPS }, 5); |
| } |
| |
| #[test] |
| #[should_panic] |
| fn test_vec_truncate_fail() { |
| struct BadElem(i32); |
| impl Drop for BadElem { |
| fn drop(&mut self) { |
| let BadElem(ref mut x) = *self; |
| if *x == 0xbadbeef { |
| panic!("BadElem panic: 0xbadbeef") |
| } |
| } |
| } |
| |
| let mut v = vec![BadElem(1), BadElem(2), BadElem(0xbadbeef), BadElem(4)]; |
| v.truncate(0); |
| } |
| |
| #[test] |
| fn test_index() { |
| let vec = vec![1, 2, 3]; |
| assert!(vec[1] == 2); |
| } |
| |
| #[test] |
| #[should_panic] |
| fn test_index_out_of_bounds() { |
| let vec = vec![1, 2, 3]; |
| let _ = vec[3]; |
| } |
| |
| #[test] |
| #[should_panic] |
| fn test_slice_out_of_bounds_1() { |
| let x = vec![1, 2, 3, 4, 5]; |
| let _ = &x[!0..]; |
| } |
| |
| #[test] |
| #[should_panic] |
| fn test_slice_out_of_bounds_2() { |
| let x = vec![1, 2, 3, 4, 5]; |
| let _ = &x[..6]; |
| } |
| |
| #[test] |
| #[should_panic] |
| fn test_slice_out_of_bounds_3() { |
| let x = vec![1, 2, 3, 4, 5]; |
| let _ = &x[!0..4]; |
| } |
| |
| #[test] |
| #[should_panic] |
| fn test_slice_out_of_bounds_4() { |
| let x = vec![1, 2, 3, 4, 5]; |
| let _ = &x[1..6]; |
| } |
| |
| #[test] |
| #[should_panic] |
| fn test_slice_out_of_bounds_5() { |
| let x = vec![1, 2, 3, 4, 5]; |
| let _ = &x[3..2]; |
| } |
| |
| #[test] |
| #[should_panic] |
| fn test_swap_remove_empty() { |
| let mut vec = Vec::<i32>::new(); |
| vec.swap_remove(0); |
| } |
| |
| #[test] |
| fn test_move_items() { |
| let vec = vec![1, 2, 3]; |
| let mut vec2 = vec![]; |
| for i in vec { |
| vec2.push(i); |
| } |
| assert_eq!(vec2, [1, 2, 3]); |
| } |
| |
| #[test] |
| fn test_move_items_reverse() { |
| let vec = vec![1, 2, 3]; |
| let mut vec2 = vec![]; |
| for i in vec.into_iter().rev() { |
| vec2.push(i); |
| } |
| assert_eq!(vec2, [3, 2, 1]); |
| } |
| |
| #[test] |
| fn test_move_items_zero_sized() { |
| let vec = vec![(), (), ()]; |
| let mut vec2 = vec![]; |
| for i in vec { |
| vec2.push(i); |
| } |
| assert_eq!(vec2, [(), (), ()]); |
| } |
| |
| #[test] |
| fn test_drain_empty_vec() { |
| let mut vec: Vec<i32> = vec![]; |
| let mut vec2: Vec<i32> = vec![]; |
| for i in vec.drain(..) { |
| vec2.push(i); |
| } |
| assert!(vec.is_empty()); |
| assert!(vec2.is_empty()); |
| } |
| |
| #[test] |
| fn test_drain_items() { |
| let mut vec = vec![1, 2, 3]; |
| let mut vec2 = vec![]; |
| for i in vec.drain(..) { |
| vec2.push(i); |
| } |
| assert_eq!(vec, []); |
| assert_eq!(vec2, [1, 2, 3]); |
| } |
| |
| #[test] |
| fn test_drain_items_reverse() { |
| let mut vec = vec![1, 2, 3]; |
| let mut vec2 = vec![]; |
| for i in vec.drain(..).rev() { |
| vec2.push(i); |
| } |
| assert_eq!(vec, []); |
| assert_eq!(vec2, [3, 2, 1]); |
| } |
| |
| #[test] |
| fn test_drain_items_zero_sized() { |
| let mut vec = vec![(), (), ()]; |
| let mut vec2 = vec![]; |
| for i in vec.drain(..) { |
| vec2.push(i); |
| } |
| assert_eq!(vec, []); |
| assert_eq!(vec2, [(), (), ()]); |
| } |
| |
| #[test] |
| #[should_panic] |
| fn test_drain_out_of_bounds() { |
| let mut v = vec![1, 2, 3, 4, 5]; |
| v.drain(5..6); |
| } |
| |
| #[test] |
| fn test_drain_range() { |
| let mut v = vec![1, 2, 3, 4, 5]; |
| for _ in v.drain(4..) {} |
| assert_eq!(v, &[1, 2, 3, 4]); |
| |
| let mut v: Vec<_> = (1..6).map(|x| x.to_string()).collect(); |
| for _ in v.drain(1..4) {} |
| assert_eq!(v, &[1.to_string(), 5.to_string()]); |
| |
| let mut v: Vec<_> = (1..6).map(|x| x.to_string()).collect(); |
| for _ in v.drain(1..4).rev() {} |
| assert_eq!(v, &[1.to_string(), 5.to_string()]); |
| |
| let mut v: Vec<_> = vec![(); 5]; |
| for _ in v.drain(1..4).rev() {} |
| assert_eq!(v, &[(), ()]); |
| } |
| |
| #[test] |
| fn test_drain_inclusive_range() { |
| let mut v = vec!['a', 'b', 'c', 'd', 'e']; |
| for _ in v.drain(1..=3) {} |
| assert_eq!(v, &['a', 'e']); |
| |
| let mut v: Vec<_> = (0..=5).map(|x| x.to_string()).collect(); |
| for _ in v.drain(1..=5) {} |
| assert_eq!(v, &["0".to_string()]); |
| |
| let mut v: Vec<String> = (0..=5).map(|x| x.to_string()).collect(); |
| for _ in v.drain(0..=5) {} |
| assert_eq!(v, Vec::<String>::new()); |
| |
| let mut v: Vec<_> = (0..=5).map(|x| x.to_string()).collect(); |
| for _ in v.drain(0..=3) {} |
| assert_eq!(v, &["4".to_string(), "5".to_string()]); |
| |
| let mut v: Vec<_> = (0..=1).map(|x| x.to_string()).collect(); |
| for _ in v.drain(..=0) {} |
| assert_eq!(v, &["1".to_string()]); |
| } |
| |
| #[test] |
| fn test_drain_max_vec_size() { |
| let mut v = Vec::<()>::with_capacity(usize::MAX); |
| unsafe { |
| v.set_len(usize::MAX); |
| } |
| for _ in v.drain(usize::MAX - 1..) {} |
| assert_eq!(v.len(), usize::MAX - 1); |
| |
| let mut v = Vec::<()>::with_capacity(usize::MAX); |
| unsafe { |
| v.set_len(usize::MAX); |
| } |
| for _ in v.drain(usize::MAX - 1..=usize::MAX - 1) {} |
| assert_eq!(v.len(), usize::MAX - 1); |
| } |
| |
| #[test] |
| #[should_panic] |
| fn test_drain_index_overflow() { |
| let mut v = Vec::<()>::with_capacity(usize::MAX); |
| unsafe { |
| v.set_len(usize::MAX); |
| } |
| v.drain(0..=usize::MAX); |
| } |
| |
| #[test] |
| #[should_panic] |
| fn test_drain_inclusive_out_of_bounds() { |
| let mut v = vec![1, 2, 3, 4, 5]; |
| v.drain(5..=5); |
| } |
| |
| #[test] |
| #[should_panic] |
| fn test_drain_start_overflow() { |
| let mut v = vec![1, 2, 3]; |
| v.drain((Excluded(usize::MAX), Included(0))); |
| } |
| |
| #[test] |
| #[should_panic] |
| fn test_drain_end_overflow() { |
| let mut v = vec![1, 2, 3]; |
| v.drain((Included(0), Included(usize::MAX))); |
| } |
| |
| #[test] |
| #[cfg_attr(not(panic = "unwind"), ignore = "test requires unwinding support")] |
| fn test_drain_leak() { |
| static mut DROPS: i32 = 0; |
| |
| #[derive(Debug, PartialEq)] |
| struct D(u32, bool); |
| |
| impl Drop for D { |
| fn drop(&mut self) { |
| unsafe { |
| DROPS += 1; |
| } |
| |
| if self.1 { |
| panic!("panic in `drop`"); |
| } |
| } |
| } |
| |
| let mut v = vec![ |
| D(0, false), |
| D(1, false), |
| D(2, false), |
| D(3, false), |
| D(4, true), |
| D(5, false), |
| D(6, false), |
| ]; |
| |
| catch_unwind(AssertUnwindSafe(|| { |
| v.drain(2..=5); |
| })) |
| .ok(); |
| |
| assert_eq!(unsafe { DROPS }, 4); |
| assert_eq!(v, vec![D(0, false), D(1, false), D(6, false),]); |
| } |
| |
| #[test] |
| fn test_drain_keep_rest() { |
| let mut v = vec![0, 1, 2, 3, 4, 5, 6]; |
| let mut drain = v.drain(1..6); |
| assert_eq!(drain.next(), Some(1)); |
| assert_eq!(drain.next_back(), Some(5)); |
| assert_eq!(drain.next(), Some(2)); |
| |
| drain.keep_rest(); |
| assert_eq!(v, &[0, 3, 4, 6]); |
| } |
| |
| #[test] |
| fn test_drain_keep_rest_all() { |
| let mut v = vec![0, 1, 2, 3, 4, 5, 6]; |
| v.drain(1..6).keep_rest(); |
| assert_eq!(v, &[0, 1, 2, 3, 4, 5, 6]); |
| } |
| |
| #[test] |
| fn test_drain_keep_rest_none() { |
| let mut v = vec![0, 1, 2, 3, 4, 5, 6]; |
| let mut drain = v.drain(1..6); |
| |
| drain.by_ref().for_each(drop); |
| |
| drain.keep_rest(); |
| assert_eq!(v, &[0, 6]); |
| } |
| |
| #[test] |
| fn test_splice() { |
| let mut v = vec![1, 2, 3, 4, 5]; |
| let a = [10, 11, 12]; |
| v.splice(2..4, a); |
| assert_eq!(v, &[1, 2, 10, 11, 12, 5]); |
| v.splice(1..3, Some(20)); |
| assert_eq!(v, &[1, 20, 11, 12, 5]); |
| } |
| |
| #[test] |
| fn test_splice_inclusive_range() { |
| let mut v = vec![1, 2, 3, 4, 5]; |
| let a = [10, 11, 12]; |
| let t1: Vec<_> = v.splice(2..=3, a).collect(); |
| assert_eq!(v, &[1, 2, 10, 11, 12, 5]); |
| assert_eq!(t1, &[3, 4]); |
| let t2: Vec<_> = v.splice(1..=2, Some(20)).collect(); |
| assert_eq!(v, &[1, 20, 11, 12, 5]); |
| assert_eq!(t2, &[2, 10]); |
| } |
| |
| #[test] |
| #[should_panic] |
| fn test_splice_out_of_bounds() { |
| let mut v = vec![1, 2, 3, 4, 5]; |
| let a = [10, 11, 12]; |
| v.splice(5..6, a); |
| } |
| |
| #[test] |
| #[should_panic] |
| fn test_splice_inclusive_out_of_bounds() { |
| let mut v = vec![1, 2, 3, 4, 5]; |
| let a = [10, 11, 12]; |
| v.splice(5..=5, a); |
| } |
| |
| #[test] |
| fn test_splice_items_zero_sized() { |
| let mut vec = vec![(), (), ()]; |
| let vec2 = vec![]; |
| let t: Vec<_> = vec.splice(1..2, vec2.iter().cloned()).collect(); |
| assert_eq!(vec, &[(), ()]); |
| assert_eq!(t, &[()]); |
| } |
| |
| #[test] |
| fn test_splice_unbounded() { |
| let mut vec = vec![1, 2, 3, 4, 5]; |
| let t: Vec<_> = vec.splice(.., None).collect(); |
| assert_eq!(vec, &[]); |
| assert_eq!(t, &[1, 2, 3, 4, 5]); |
| } |
| |
| #[test] |
| fn test_splice_forget() { |
| let mut v = vec![1, 2, 3, 4, 5]; |
| let a = [10, 11, 12]; |
| std::mem::forget(v.splice(2..4, a)); |
| assert_eq!(v, &[1, 2]); |
| } |
| |
| #[test] |
| fn test_into_boxed_slice() { |
| let xs = vec![1, 2, 3]; |
| let ys = xs.into_boxed_slice(); |
| assert_eq!(&*ys, [1, 2, 3]); |
| } |
| |
| #[test] |
| fn test_append() { |
| let mut vec = vec![1, 2, 3]; |
| let mut vec2 = vec![4, 5, 6]; |
| vec.append(&mut vec2); |
| assert_eq!(vec, [1, 2, 3, 4, 5, 6]); |
| assert_eq!(vec2, []); |
| } |
| |
| #[test] |
| fn test_split_off() { |
| let mut vec = vec![1, 2, 3, 4, 5, 6]; |
| let orig_ptr = vec.as_ptr(); |
| let orig_capacity = vec.capacity(); |
| |
| let split_off = vec.split_off(4); |
| assert_eq!(vec, [1, 2, 3, 4]); |
| assert_eq!(split_off, [5, 6]); |
| assert_eq!(vec.capacity(), orig_capacity); |
| assert_eq!(vec.as_ptr(), orig_ptr); |
| } |
| |
| #[test] |
| fn test_split_off_take_all() { |
| // Allocate enough capacity that we can tell whether the split-off vector's |
| // capacity is based on its size, or (incorrectly) on the original capacity. |
| let mut vec = Vec::with_capacity(1000); |
| vec.extend([1, 2, 3, 4, 5, 6]); |
| let orig_ptr = vec.as_ptr(); |
| let orig_capacity = vec.capacity(); |
| |
| let split_off = vec.split_off(0); |
| assert_eq!(vec, []); |
| assert_eq!(split_off, [1, 2, 3, 4, 5, 6]); |
| assert_eq!(vec.capacity(), orig_capacity); |
| assert_eq!(vec.as_ptr(), orig_ptr); |
| |
| // The split-off vector should be newly-allocated, and should not have |
| // stolen the original vector's allocation. |
| assert!(split_off.capacity() < orig_capacity); |
| assert_ne!(split_off.as_ptr(), orig_ptr); |
| } |
| |
| #[test] |
| fn test_into_iter_as_slice() { |
| let vec = vec!['a', 'b', 'c']; |
| let mut into_iter = vec.into_iter(); |
| assert_eq!(into_iter.as_slice(), &['a', 'b', 'c']); |
| let _ = into_iter.next().unwrap(); |
| assert_eq!(into_iter.as_slice(), &['b', 'c']); |
| let _ = into_iter.next().unwrap(); |
| let _ = into_iter.next().unwrap(); |
| assert_eq!(into_iter.as_slice(), &[]); |
| } |
| |
| #[test] |
| fn test_into_iter_as_mut_slice() { |
| let vec = vec!['a', 'b', 'c']; |
| let mut into_iter = vec.into_iter(); |
| assert_eq!(into_iter.as_slice(), &['a', 'b', 'c']); |
| into_iter.as_mut_slice()[0] = 'x'; |
| into_iter.as_mut_slice()[1] = 'y'; |
| assert_eq!(into_iter.next().unwrap(), 'x'); |
| assert_eq!(into_iter.as_slice(), &['y', 'c']); |
| } |
| |
| #[test] |
| fn test_into_iter_debug() { |
| let vec = vec!['a', 'b', 'c']; |
| let into_iter = vec.into_iter(); |
| let debug = format!("{into_iter:?}"); |
| assert_eq!(debug, "IntoIter(['a', 'b', 'c'])"); |
| } |
| |
| #[test] |
| fn test_into_iter_count() { |
| assert_eq!([1, 2, 3].into_iter().count(), 3); |
| } |
| |
| #[test] |
| fn test_into_iter_next_chunk() { |
| let mut iter = b"lorem".to_vec().into_iter(); |
| |
| assert_eq!(iter.next_chunk().unwrap(), [b'l', b'o']); // N is inferred as 2 |
| assert_eq!(iter.next_chunk().unwrap(), [b'r', b'e', b'm']); // N is inferred as 3 |
| assert_eq!(iter.next_chunk::<4>().unwrap_err().as_slice(), &[]); // N is explicitly 4 |
| } |
| |
| #[test] |
| fn test_into_iter_clone() { |
| fn iter_equal<I: Iterator<Item = i32>>(it: I, slice: &[i32]) { |
| let v: Vec<i32> = it.collect(); |
| assert_eq!(&v[..], slice); |
| } |
| let mut it = [1, 2, 3].into_iter(); |
| iter_equal(it.clone(), &[1, 2, 3]); |
| assert_eq!(it.next(), Some(1)); |
| let mut it = it.rev(); |
| iter_equal(it.clone(), &[3, 2]); |
| assert_eq!(it.next(), Some(3)); |
| iter_equal(it.clone(), &[2]); |
| assert_eq!(it.next(), Some(2)); |
| iter_equal(it.clone(), &[]); |
| assert_eq!(it.next(), None); |
| } |
| |
| #[test] |
| #[cfg_attr(not(panic = "unwind"), ignore = "test requires unwinding support")] |
| fn test_into_iter_leak() { |
| static mut DROPS: i32 = 0; |
| |
| struct D(bool); |
| |
| impl Drop for D { |
| fn drop(&mut self) { |
| unsafe { |
| DROPS += 1; |
| } |
| |
| if self.0 { |
| panic!("panic in `drop`"); |
| } |
| } |
| } |
| |
| let v = vec![D(false), D(true), D(false)]; |
| |
| catch_unwind(move || drop(v.into_iter())).ok(); |
| |
| assert_eq!(unsafe { DROPS }, 3); |
| } |
| |
| #[test] |
| fn test_into_iter_advance_by() { |
| let mut i = vec![1, 2, 3, 4, 5].into_iter(); |
| assert_eq!(i.advance_by(0), Ok(())); |
| assert_eq!(i.advance_back_by(0), Ok(())); |
| assert_eq!(i.as_slice(), [1, 2, 3, 4, 5]); |
| |
| assert_eq!(i.advance_by(1), Ok(())); |
| assert_eq!(i.advance_back_by(1), Ok(())); |
| assert_eq!(i.as_slice(), [2, 3, 4]); |
| |
| assert_eq!(i.advance_back_by(usize::MAX), Err(NonZero::new(usize::MAX - 3).unwrap())); |
| |
| assert_eq!(i.advance_by(usize::MAX), Err(NonZero::new(usize::MAX).unwrap())); |
| |
| assert_eq!(i.advance_by(0), Ok(())); |
| assert_eq!(i.advance_back_by(0), Ok(())); |
| |
| assert_eq!(i.len(), 0); |
| } |
| |
| #[test] |
| fn test_into_iter_drop_allocator() { |
| struct ReferenceCountedAllocator<'a>(#[allow(dead_code)] DropCounter<'a>); |
| |
| unsafe impl Allocator for ReferenceCountedAllocator<'_> { |
| fn allocate(&self, layout: Layout) -> Result<NonNull<[u8]>, core::alloc::AllocError> { |
| System.allocate(layout) |
| } |
| |
| unsafe fn deallocate(&self, ptr: NonNull<u8>, layout: Layout) { |
| // Safety: Invariants passed to caller. |
| unsafe { System.deallocate(ptr, layout) } |
| } |
| } |
| |
| let mut drop_count = 0; |
| |
| let allocator = ReferenceCountedAllocator(DropCounter { count: &mut drop_count }); |
| let _ = Vec::<u32, _>::new_in(allocator); |
| assert_eq!(drop_count, 1); |
| |
| let allocator = ReferenceCountedAllocator(DropCounter { count: &mut drop_count }); |
| let _ = Vec::<u32, _>::new_in(allocator).into_iter(); |
| assert_eq!(drop_count, 2); |
| } |
| |
| #[test] |
| fn test_into_iter_zst() { |
| #[derive(Debug, Clone)] |
| struct AlignedZstWithDrop([u64; 0]); |
| impl Drop for AlignedZstWithDrop { |
| fn drop(&mut self) { |
| let addr = self as *mut _ as usize; |
| assert!(hint::black_box(addr) % mem::align_of::<u64>() == 0); |
| } |
| } |
| |
| const C: AlignedZstWithDrop = AlignedZstWithDrop([0u64; 0]); |
| |
| for _ in vec![C].into_iter() {} |
| for _ in vec![C; 5].into_iter().rev() {} |
| |
| let mut it = vec![C, C].into_iter(); |
| assert_eq!(it.advance_by(1), Ok(())); |
| drop(it); |
| |
| let mut it = vec![C, C].into_iter(); |
| it.next_chunk::<1>().unwrap(); |
| drop(it); |
| |
| let mut it = vec![C, C].into_iter(); |
| it.next_chunk::<4>().unwrap_err(); |
| drop(it); |
| } |
| |
| #[test] |
| fn test_from_iter_specialization() { |
| let src: Vec<usize> = vec![0usize; 1]; |
| let srcptr = src.as_ptr(); |
| let sink = src.into_iter().collect::<Vec<_>>(); |
| let sinkptr = sink.as_ptr(); |
| assert_eq!(srcptr, sinkptr); |
| } |
| |
| #[test] |
| fn test_from_iter_partially_drained_in_place_specialization() { |
| let src: Vec<usize> = vec![0usize; 10]; |
| let srcptr = src.as_ptr(); |
| let mut iter = src.into_iter(); |
| iter.next(); |
| iter.next(); |
| let sink = iter.collect::<Vec<_>>(); |
| let sinkptr = sink.as_ptr(); |
| assert_eq!(srcptr, sinkptr); |
| } |
| |
| #[test] |
| fn test_from_iter_specialization_with_iterator_adapters() { |
| fn assert_in_place_trait<T: InPlaceIterable>(_: &T) {} |
| let owned: Vec<usize> = vec![0usize; 256]; |
| let refd: Vec<&usize> = owned.iter().collect(); |
| let src: Vec<&&usize> = refd.iter().collect(); |
| let srcptr = src.as_ptr(); |
| let iter = src |
| .into_iter() |
| .copied() |
| .cloned() |
| .enumerate() |
| .map(|i| i.0 + i.1) |
| .zip(std::iter::repeat(1usize)) |
| .map(|(a, b)| a + b) |
| .map_while(Option::Some) |
| .skip(1) |
| .map(|e| if e != usize::MAX { Ok(NonZero::new(e)) } else { Err(()) }); |
| assert_in_place_trait(&iter); |
| let sink = iter.collect::<Result<Vec<_>, _>>().unwrap(); |
| let sinkptr = sink.as_ptr(); |
| assert_eq!(srcptr as *const usize, sinkptr as *const usize); |
| } |
| |
| #[test] |
| fn test_in_place_specialization_step_up_down() { |
| fn assert_in_place_trait<T: InPlaceIterable>(_: &T) {} |
| let src = vec![[0u8; 4]; 256]; |
| let srcptr = src.as_ptr(); |
| let src_cap = src.capacity(); |
| let iter = src.into_iter().flatten(); |
| assert_in_place_trait(&iter); |
| let sink = iter.collect::<Vec<_>>(); |
| let sinkptr = sink.as_ptr(); |
| assert_eq!(srcptr as *const u8, sinkptr); |
| assert_eq!(src_cap * 4, sink.capacity()); |
| |
| let iter = sink.into_iter().array_chunks::<4>(); |
| assert_in_place_trait(&iter); |
| let sink = iter.collect::<Vec<_>>(); |
| let sinkptr = sink.as_ptr(); |
| assert_eq!(srcptr, sinkptr); |
| assert_eq!(src_cap, sink.capacity()); |
| |
| let mut src: Vec<u8> = Vec::with_capacity(17); |
| let src_bytes = src.capacity(); |
| src.resize(8, 0u8); |
| let sink: Vec<[u8; 4]> = src.into_iter().array_chunks::<4>().collect(); |
| let sink_bytes = sink.capacity() * 4; |
| assert_ne!(src_bytes, sink_bytes); |
| assert_eq!(sink.len(), 2); |
| |
| let mut src: Vec<[u8; 3]> = Vec::with_capacity(17); |
| src.resize(8, [0; 3]); |
| let iter = src.into_iter().map(|[a, b, _]| [a, b]); |
| assert_in_place_trait(&iter); |
| let sink: Vec<[u8; 2]> = iter.collect(); |
| assert_eq!(sink.len(), 8); |
| assert!(sink.capacity() <= 25); |
| |
| let src = vec![[0u8; 4]; 256]; |
| let srcptr = src.as_ptr(); |
| let iter = src.into_iter().flat_map(|a| a.into_iter().map(|b| b.wrapping_add(1))); |
| assert_in_place_trait(&iter); |
| let sink = iter.collect::<Vec<_>>(); |
| assert_eq!(srcptr as *const u8, sink.as_ptr()); |
| } |
| |
| #[test] |
| fn test_from_iter_specialization_head_tail_drop() { |
| let drop_count: Vec<_> = (0..=2).map(|_| Rc::new(())).collect(); |
| let src: Vec<_> = drop_count.iter().cloned().collect(); |
| let srcptr = src.as_ptr(); |
| let iter = src.into_iter(); |
| let sink: Vec<_> = iter.skip(1).take(1).collect(); |
| let sinkptr = sink.as_ptr(); |
| assert_eq!(srcptr, sinkptr, "specialization was applied"); |
| assert_eq!(Rc::strong_count(&drop_count[0]), 1, "front was dropped"); |
| assert_eq!(Rc::strong_count(&drop_count[1]), 2, "one element was collected"); |
| assert_eq!(Rc::strong_count(&drop_count[2]), 1, "tail was dropped"); |
| assert_eq!(sink.len(), 1); |
| } |
| |
| #[test] |
| #[cfg_attr(not(panic = "unwind"), ignore = "test requires unwinding support")] |
| fn test_from_iter_specialization_panic_during_iteration_drops() { |
| let drop_count: Vec<_> = (0..=2).map(|_| Rc::new(())).collect(); |
| let src: Vec<_> = drop_count.iter().cloned().collect(); |
| let iter = src.into_iter(); |
| |
| let _ = std::panic::catch_unwind(AssertUnwindSafe(|| { |
| let _ = iter |
| .enumerate() |
| .filter_map(|(i, e)| { |
| if i == 1 { |
| std::panic!("aborting iteration"); |
| } |
| Some(e) |
| }) |
| .collect::<Vec<_>>(); |
| })); |
| |
| assert!( |
| drop_count.iter().map(Rc::strong_count).all(|count| count == 1), |
| "all items were dropped once" |
| ); |
| } |
| |
| #[test] |
| #[cfg_attr(not(panic = "unwind"), ignore = "test requires unwinding support")] |
| // FIXME(static_mut_refs): Do not allow `static_mut_refs` lint |
| #[cfg_attr(not(bootstrap), allow(static_mut_refs))] |
| fn test_from_iter_specialization_panic_during_drop_doesnt_leak() { |
| static mut DROP_COUNTER_OLD: [usize; 5] = [0; 5]; |
| static mut DROP_COUNTER_NEW: [usize; 2] = [0; 2]; |
| |
| #[derive(Debug)] |
| struct Old(usize); |
| |
| impl Drop for Old { |
| fn drop(&mut self) { |
| unsafe { |
| DROP_COUNTER_OLD[self.0] += 1; |
| } |
| |
| if self.0 == 3 { |
| panic!(); |
| } |
| |
| println!("Dropped Old: {}", self.0); |
| } |
| } |
| |
| #[derive(Debug)] |
| struct New(usize); |
| |
| impl Drop for New { |
| fn drop(&mut self) { |
| unsafe { |
| DROP_COUNTER_NEW[self.0] += 1; |
| } |
| |
| println!("Dropped New: {}", self.0); |
| } |
| } |
| |
| let _ = std::panic::catch_unwind(AssertUnwindSafe(|| { |
| let v = vec![Old(0), Old(1), Old(2), Old(3), Old(4)]; |
| let _ = v.into_iter().map(|x| New(x.0)).take(2).collect::<Vec<_>>(); |
| })); |
| |
| assert_eq!(unsafe { DROP_COUNTER_OLD[0] }, 1); |
| assert_eq!(unsafe { DROP_COUNTER_OLD[1] }, 1); |
| assert_eq!(unsafe { DROP_COUNTER_OLD[2] }, 1); |
| assert_eq!(unsafe { DROP_COUNTER_OLD[3] }, 1); |
| assert_eq!(unsafe { DROP_COUNTER_OLD[4] }, 1); |
| |
| assert_eq!(unsafe { DROP_COUNTER_NEW[0] }, 1); |
| assert_eq!(unsafe { DROP_COUNTER_NEW[1] }, 1); |
| } |
| |
| // regression test for issue #85322. Peekable previously implemented InPlaceIterable, |
| // but due to an interaction with IntoIter's current Clone implementation it failed to uphold |
| // the contract. |
| #[test] |
| fn test_collect_after_iterator_clone() { |
| let v = vec![0; 5]; |
| let mut i = v.into_iter().map(|i| i + 1).peekable(); |
| i.peek(); |
| let v = i.clone().collect::<Vec<_>>(); |
| assert_eq!(v, [1, 1, 1, 1, 1]); |
| assert!(v.len() <= v.capacity()); |
| } |
| #[test] |
| fn test_cow_from() { |
| let borrowed: &[_] = &["borrowed", "(slice)"]; |
| let owned = vec!["owned", "(vec)"]; |
| match (Cow::from(owned.clone()), Cow::from(borrowed)) { |
| (Cow::Owned(o), Cow::Borrowed(b)) => assert!(o == owned && b == borrowed), |
| _ => panic!("invalid `Cow::from`"), |
| } |
| } |
| |
| #[test] |
| fn test_from_cow() { |
| let borrowed: &[_] = &["borrowed", "(slice)"]; |
| let owned = vec!["owned", "(vec)"]; |
| assert_eq!(Vec::from(Cow::Borrowed(borrowed)), vec!["borrowed", "(slice)"]); |
| assert_eq!(Vec::from(Cow::Owned(owned)), vec!["owned", "(vec)"]); |
| } |
| |
| #[allow(dead_code)] |
| fn assert_covariance() { |
| fn drain<'new>(d: Drain<'static, &'static str>) -> Drain<'new, &'new str> { |
| d |
| } |
| fn into_iter<'new>(i: IntoIter<&'static str>) -> IntoIter<&'new str> { |
| i |
| } |
| } |
| |
| #[test] |
| fn from_into_inner() { |
| let vec = vec![1, 2, 3]; |
| let ptr = vec.as_ptr(); |
| let vec = vec.into_iter().collect::<Vec<_>>(); |
| assert_eq!(vec, [1, 2, 3]); |
| assert_eq!(vec.as_ptr(), ptr); |
| |
| let ptr = &vec[1] as *const _; |
| let mut it = vec.into_iter(); |
| it.next().unwrap(); |
| let vec = it.collect::<Vec<_>>(); |
| assert_eq!(vec, [2, 3]); |
| assert!(ptr != vec.as_ptr()); |
| } |
| |
| #[test] |
| fn overaligned_allocations() { |
| #[repr(align(256))] |
| struct Foo(usize); |
| let mut v = vec![Foo(273)]; |
| for i in 0..0x1000 { |
| v.reserve_exact(i); |
| assert!(v[0].0 == 273); |
| assert!(v.as_ptr() as usize & 0xff == 0); |
| v.shrink_to_fit(); |
| assert!(v[0].0 == 273); |
| assert!(v.as_ptr() as usize & 0xff == 0); |
| } |
| } |
| |
| #[test] |
| fn extract_if_empty() { |
| let mut vec: Vec<i32> = vec![]; |
| |
| { |
| let mut iter = vec.extract_if(|_| true); |
| assert_eq!(iter.size_hint(), (0, Some(0))); |
| assert_eq!(iter.next(), None); |
| assert_eq!(iter.size_hint(), (0, Some(0))); |
| assert_eq!(iter.next(), None); |
| assert_eq!(iter.size_hint(), (0, Some(0))); |
| } |
| assert_eq!(vec.len(), 0); |
| assert_eq!(vec, vec![]); |
| } |
| |
| #[test] |
| fn extract_if_zst() { |
| let mut vec = vec![(), (), (), (), ()]; |
| let initial_len = vec.len(); |
| let mut count = 0; |
| { |
| let mut iter = vec.extract_if(|_| true); |
| assert_eq!(iter.size_hint(), (0, Some(initial_len))); |
| while let Some(_) = iter.next() { |
| count += 1; |
| assert_eq!(iter.size_hint(), (0, Some(initial_len - count))); |
| } |
| assert_eq!(iter.size_hint(), (0, Some(0))); |
| assert_eq!(iter.next(), None); |
| assert_eq!(iter.size_hint(), (0, Some(0))); |
| } |
| |
| assert_eq!(count, initial_len); |
| assert_eq!(vec.len(), 0); |
| assert_eq!(vec, vec![]); |
| } |
| |
| #[test] |
| fn extract_if_false() { |
| let mut vec = vec![1, 2, 3, 4, 5, 6, 7, 8, 9, 10]; |
| |
| let initial_len = vec.len(); |
| let mut count = 0; |
| { |
| let mut iter = vec.extract_if(|_| false); |
| assert_eq!(iter.size_hint(), (0, Some(initial_len))); |
| for _ in iter.by_ref() { |
| count += 1; |
| } |
| assert_eq!(iter.size_hint(), (0, Some(0))); |
| assert_eq!(iter.next(), None); |
| assert_eq!(iter.size_hint(), (0, Some(0))); |
| } |
| |
| assert_eq!(count, 0); |
| assert_eq!(vec.len(), initial_len); |
| assert_eq!(vec, vec![1, 2, 3, 4, 5, 6, 7, 8, 9, 10]); |
| } |
| |
| #[test] |
| fn extract_if_true() { |
| let mut vec = vec![1, 2, 3, 4, 5, 6, 7, 8, 9, 10]; |
| |
| let initial_len = vec.len(); |
| let mut count = 0; |
| { |
| let mut iter = vec.extract_if(|_| true); |
| assert_eq!(iter.size_hint(), (0, Some(initial_len))); |
| while let Some(_) = iter.next() { |
| count += 1; |
| assert_eq!(iter.size_hint(), (0, Some(initial_len - count))); |
| } |
| assert_eq!(iter.size_hint(), (0, Some(0))); |
| assert_eq!(iter.next(), None); |
| assert_eq!(iter.size_hint(), (0, Some(0))); |
| } |
| |
| assert_eq!(count, initial_len); |
| assert_eq!(vec.len(), 0); |
| assert_eq!(vec, vec![]); |
| } |
| |
| #[test] |
| fn extract_if_complex() { |
| { |
| // [+xxx++++++xxxxx++++x+x++] |
| let mut vec = vec![ |
| 1, 2, 4, 6, 7, 9, 11, 13, 15, 17, 18, 20, 22, 24, 26, 27, 29, 31, 33, 34, 35, 36, 37, |
| 39, |
| ]; |
| |
| let removed = vec.extract_if(|x| *x % 2 == 0).collect::<Vec<_>>(); |
| assert_eq!(removed.len(), 10); |
| assert_eq!(removed, vec![2, 4, 6, 18, 20, 22, 24, 26, 34, 36]); |
| |
| assert_eq!(vec.len(), 14); |
| assert_eq!(vec, vec![1, 7, 9, 11, 13, 15, 17, 27, 29, 31, 33, 35, 37, 39]); |
| } |
| |
| { |
| // [xxx++++++xxxxx++++x+x++] |
| let mut vec = vec![ |
| 2, 4, 6, 7, 9, 11, 13, 15, 17, 18, 20, 22, 24, 26, 27, 29, 31, 33, 34, 35, 36, 37, 39, |
| ]; |
| |
| let removed = vec.extract_if(|x| *x % 2 == 0).collect::<Vec<_>>(); |
| assert_eq!(removed.len(), 10); |
| assert_eq!(removed, vec![2, 4, 6, 18, 20, 22, 24, 26, 34, 36]); |
| |
| assert_eq!(vec.len(), 13); |
| assert_eq!(vec, vec![7, 9, 11, 13, 15, 17, 27, 29, 31, 33, 35, 37, 39]); |
| } |
| |
| { |
| // [xxx++++++xxxxx++++x+x] |
| let mut vec = |
| vec![2, 4, 6, 7, 9, 11, 13, 15, 17, 18, 20, 22, 24, 26, 27, 29, 31, 33, 34, 35, 36]; |
| |
| let removed = vec.extract_if(|x| *x % 2 == 0).collect::<Vec<_>>(); |
| assert_eq!(removed.len(), 10); |
| assert_eq!(removed, vec![2, 4, 6, 18, 20, 22, 24, 26, 34, 36]); |
| |
| assert_eq!(vec.len(), 11); |
| assert_eq!(vec, vec![7, 9, 11, 13, 15, 17, 27, 29, 31, 33, 35]); |
| } |
| |
| { |
| // [xxxxxxxxxx+++++++++++] |
| let mut vec = vec![2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 1, 3, 5, 7, 9, 11, 13, 15, 17, 19]; |
| |
| let removed = vec.extract_if(|x| *x % 2 == 0).collect::<Vec<_>>(); |
| assert_eq!(removed.len(), 10); |
| assert_eq!(removed, vec![2, 4, 6, 8, 10, 12, 14, 16, 18, 20]); |
| |
| assert_eq!(vec.len(), 10); |
| assert_eq!(vec, vec![1, 3, 5, 7, 9, 11, 13, 15, 17, 19]); |
| } |
| |
| { |
| // [+++++++++++xxxxxxxxxx] |
| let mut vec = vec![1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20]; |
| |
| let removed = vec.extract_if(|x| *x % 2 == 0).collect::<Vec<_>>(); |
| assert_eq!(removed.len(), 10); |
| assert_eq!(removed, vec![2, 4, 6, 8, 10, 12, 14, 16, 18, 20]); |
| |
| assert_eq!(vec.len(), 10); |
| assert_eq!(vec, vec![1, 3, 5, 7, 9, 11, 13, 15, 17, 19]); |
| } |
| } |
| |
| // FIXME: re-enable emscripten once it can unwind again |
| #[test] |
| #[cfg(not(target_os = "emscripten"))] |
| #[cfg_attr(not(panic = "unwind"), ignore = "test requires unwinding support")] |
| fn extract_if_consumed_panic() { |
| use std::rc::Rc; |
| use std::sync::Mutex; |
| |
| struct Check { |
| index: usize, |
| drop_counts: Rc<Mutex<Vec<usize>>>, |
| } |
| |
| impl Drop for Check { |
| fn drop(&mut self) { |
| self.drop_counts.lock().unwrap()[self.index] += 1; |
| println!("drop: {}", self.index); |
| } |
| } |
| |
| let check_count = 10; |
| let drop_counts = Rc::new(Mutex::new(vec![0_usize; check_count])); |
| let mut data: Vec<Check> = (0..check_count) |
| .map(|index| Check { index, drop_counts: Rc::clone(&drop_counts) }) |
| .collect(); |
| |
| let _ = std::panic::catch_unwind(move || { |
| let filter = |c: &mut Check| { |
| if c.index == 2 { |
| panic!("panic at index: {}", c.index); |
| } |
| // Verify that if the filter could panic again on another element |
| // that it would not cause a double panic and all elements of the |
| // vec would still be dropped exactly once. |
| if c.index == 4 { |
| panic!("panic at index: {}", c.index); |
| } |
| c.index < 6 |
| }; |
| let drain = data.extract_if(filter); |
| |
| // NOTE: The ExtractIf is explicitly consumed |
| drain.for_each(drop); |
| }); |
| |
| let drop_counts = drop_counts.lock().unwrap(); |
| assert_eq!(check_count, drop_counts.len()); |
| |
| for (index, count) in drop_counts.iter().cloned().enumerate() { |
| assert_eq!(1, count, "unexpected drop count at index: {} (count: {})", index, count); |
| } |
| } |
| |
| // FIXME: Re-enable emscripten once it can catch panics |
| #[test] |
| #[cfg(not(target_os = "emscripten"))] |
| #[cfg_attr(not(panic = "unwind"), ignore = "test requires unwinding support")] |
| fn extract_if_unconsumed_panic() { |
| use std::rc::Rc; |
| use std::sync::Mutex; |
| |
| struct Check { |
| index: usize, |
| drop_counts: Rc<Mutex<Vec<usize>>>, |
| } |
| |
| impl Drop for Check { |
| fn drop(&mut self) { |
| self.drop_counts.lock().unwrap()[self.index] += 1; |
| println!("drop: {}", self.index); |
| } |
| } |
| |
| let check_count = 10; |
| let drop_counts = Rc::new(Mutex::new(vec![0_usize; check_count])); |
| let mut data: Vec<Check> = (0..check_count) |
| .map(|index| Check { index, drop_counts: Rc::clone(&drop_counts) }) |
| .collect(); |
| |
| let _ = std::panic::catch_unwind(move || { |
| let filter = |c: &mut Check| { |
| if c.index == 2 { |
| panic!("panic at index: {}", c.index); |
| } |
| // Verify that if the filter could panic again on another element |
| // that it would not cause a double panic and all elements of the |
| // vec would still be dropped exactly once. |
| if c.index == 4 { |
| panic!("panic at index: {}", c.index); |
| } |
| c.index < 6 |
| }; |
| let _drain = data.extract_if(filter); |
| |
| // NOTE: The ExtractIf is dropped without being consumed |
| }); |
| |
| let drop_counts = drop_counts.lock().unwrap(); |
| assert_eq!(check_count, drop_counts.len()); |
| |
| for (index, count) in drop_counts.iter().cloned().enumerate() { |
| assert_eq!(1, count, "unexpected drop count at index: {} (count: {})", index, count); |
| } |
| } |
| |
| #[test] |
| fn extract_if_unconsumed() { |
| let mut vec = vec![1, 2, 3, 4]; |
| let drain = vec.extract_if(|&mut x| x % 2 != 0); |
| drop(drain); |
| assert_eq!(vec, [1, 2, 3, 4]); |
| } |
| |
| #[test] |
| fn test_reserve_exact() { |
| // This is all the same as test_reserve |
| |
| let mut v = Vec::new(); |
| assert_eq!(v.capacity(), 0); |
| |
| v.reserve_exact(2); |
| assert!(v.capacity() >= 2); |
| |
| for i in 0..16 { |
| v.push(i); |
| } |
| |
| assert!(v.capacity() >= 16); |
| v.reserve_exact(16); |
| assert!(v.capacity() >= 32); |
| |
| v.push(16); |
| |
| v.reserve_exact(16); |
| assert!(v.capacity() >= 33) |
| } |
| |
| #[test] |
| #[cfg_attr(miri, ignore)] // Miri does not support signalling OOM |
| fn test_try_with_capacity() { |
| let mut vec: Vec<u32> = Vec::try_with_capacity(5).unwrap(); |
| assert_eq!(0, vec.len()); |
| assert!(vec.capacity() >= 5 && vec.capacity() <= isize::MAX as usize / 4); |
| assert!(vec.spare_capacity_mut().len() >= 5); |
| |
| assert!(Vec::<u16>::try_with_capacity(isize::MAX as usize + 1).is_err()); |
| } |
| |
| #[test] |
| #[cfg_attr(miri, ignore)] // Miri does not support signalling OOM |
| fn test_try_reserve() { |
| // These are the interesting cases: |
| // * exactly isize::MAX should never trigger a CapacityOverflow (can be OOM) |
| // * > isize::MAX should always fail |
| // * On 16/32-bit should CapacityOverflow |
| // * On 64-bit should OOM |
| // * overflow may trigger when adding `len` to `cap` (in number of elements) |
| // * overflow may trigger when multiplying `new_cap` by size_of::<T> (to get bytes) |
| |
| const MAX_CAP: usize = isize::MAX as usize; |
| const MAX_USIZE: usize = usize::MAX; |
| |
| { |
| // Note: basic stuff is checked by test_reserve |
| let mut empty_bytes: Vec<u8> = Vec::new(); |
| |
| // Check isize::MAX doesn't count as an overflow |
| if let Err(CapacityOverflow) = empty_bytes.try_reserve(MAX_CAP).map_err(|e| e.kind()) { |
| panic!("isize::MAX shouldn't trigger an overflow!"); |
| } |
| // Play it again, frank! (just to be sure) |
| if let Err(CapacityOverflow) = empty_bytes.try_reserve(MAX_CAP).map_err(|e| e.kind()) { |
| panic!("isize::MAX shouldn't trigger an overflow!"); |
| } |
| |
| // Check isize::MAX + 1 does count as overflow |
| assert_matches!( |
| empty_bytes.try_reserve(MAX_CAP + 1).map_err(|e| e.kind()), |
| Err(CapacityOverflow), |
| "isize::MAX + 1 should trigger an overflow!" |
| ); |
| |
| // Check usize::MAX does count as overflow |
| assert_matches!( |
| empty_bytes.try_reserve(MAX_USIZE).map_err(|e| e.kind()), |
| Err(CapacityOverflow), |
| "usize::MAX should trigger an overflow!" |
| ); |
| } |
| |
| { |
| // Same basic idea, but with non-zero len |
| let mut ten_bytes: Vec<u8> = vec![1, 2, 3, 4, 5, 6, 7, 8, 9, 10]; |
| |
| if let Err(CapacityOverflow) = ten_bytes.try_reserve(MAX_CAP - 10).map_err(|e| e.kind()) { |
| panic!("isize::MAX shouldn't trigger an overflow!"); |
| } |
| if let Err(CapacityOverflow) = ten_bytes.try_reserve(MAX_CAP - 10).map_err(|e| e.kind()) { |
| panic!("isize::MAX shouldn't trigger an overflow!"); |
| } |
| |
| assert_matches!( |
| ten_bytes.try_reserve(MAX_CAP - 9).map_err(|e| e.kind()), |
| Err(CapacityOverflow), |
| "isize::MAX + 1 should trigger an overflow!" |
| ); |
| |
| // Should always overflow in the add-to-len |
| assert_matches!( |
| ten_bytes.try_reserve(MAX_USIZE).map_err(|e| e.kind()), |
| Err(CapacityOverflow), |
| "usize::MAX should trigger an overflow!" |
| ); |
| } |
| |
| { |
| // Same basic idea, but with interesting type size |
| let mut ten_u32s: Vec<u32> = vec![1, 2, 3, 4, 5, 6, 7, 8, 9, 10]; |
| |
| if let Err(CapacityOverflow) = ten_u32s.try_reserve(MAX_CAP / 4 - 10).map_err(|e| e.kind()) |
| { |
| panic!("isize::MAX shouldn't trigger an overflow!"); |
| } |
| if let Err(CapacityOverflow) = ten_u32s.try_reserve(MAX_CAP / 4 - 10).map_err(|e| e.kind()) |
| { |
| panic!("isize::MAX shouldn't trigger an overflow!"); |
| } |
| |
| assert_matches!( |
| ten_u32s.try_reserve(MAX_CAP / 4 - 9).map_err(|e| e.kind()), |
| Err(CapacityOverflow), |
| "isize::MAX + 1 should trigger an overflow!" |
| ); |
| |
| // Should fail in the mul-by-size |
| assert_matches!( |
| ten_u32s.try_reserve(MAX_USIZE - 20).map_err(|e| e.kind()), |
| Err(CapacityOverflow), |
| "usize::MAX should trigger an overflow!" |
| ); |
| } |
| } |
| |
| #[test] |
| #[cfg_attr(miri, ignore)] // Miri does not support signalling OOM |
| fn test_try_reserve_exact() { |
| // This is exactly the same as test_try_reserve with the method changed. |
| // See that test for comments. |
| |
| const MAX_CAP: usize = isize::MAX as usize; |
| const MAX_USIZE: usize = usize::MAX; |
| |
| { |
| let mut empty_bytes: Vec<u8> = Vec::new(); |
| |
| if let Err(CapacityOverflow) = empty_bytes.try_reserve_exact(MAX_CAP).map_err(|e| e.kind()) |
| { |
| panic!("isize::MAX shouldn't trigger an overflow!"); |
| } |
| if let Err(CapacityOverflow) = empty_bytes.try_reserve_exact(MAX_CAP).map_err(|e| e.kind()) |
| { |
| panic!("isize::MAX shouldn't trigger an overflow!"); |
| } |
| |
| assert_matches!( |
| empty_bytes.try_reserve_exact(MAX_CAP + 1).map_err(|e| e.kind()), |
| Err(CapacityOverflow), |
| "isize::MAX + 1 should trigger an overflow!" |
| ); |
| |
| assert_matches!( |
| empty_bytes.try_reserve_exact(MAX_USIZE).map_err(|e| e.kind()), |
| Err(CapacityOverflow), |
| "usize::MAX should trigger an overflow!" |
| ); |
| } |
| |
| { |
| let mut ten_bytes: Vec<u8> = vec![1, 2, 3, 4, 5, 6, 7, 8, 9, 10]; |
| |
| if let Err(CapacityOverflow) = |
| ten_bytes.try_reserve_exact(MAX_CAP - 10).map_err(|e| e.kind()) |
| { |
| panic!("isize::MAX shouldn't trigger an overflow!"); |
| } |
| if let Err(CapacityOverflow) = |
| ten_bytes.try_reserve_exact(MAX_CAP - 10).map_err(|e| e.kind()) |
| { |
| panic!("isize::MAX shouldn't trigger an overflow!"); |
| } |
| |
| assert_matches!( |
| ten_bytes.try_reserve_exact(MAX_CAP - 9).map_err(|e| e.kind()), |
| Err(CapacityOverflow), |
| "isize::MAX + 1 should trigger an overflow!" |
| ); |
| |
| assert_matches!( |
| ten_bytes.try_reserve_exact(MAX_USIZE).map_err(|e| e.kind()), |
| Err(CapacityOverflow), |
| "usize::MAX should trigger an overflow!" |
| ); |
| } |
| |
| { |
| let mut ten_u32s: Vec<u32> = vec![1, 2, 3, 4, 5, 6, 7, 8, 9, 10]; |
| |
| if let Err(CapacityOverflow) = |
| ten_u32s.try_reserve_exact(MAX_CAP / 4 - 10).map_err(|e| e.kind()) |
| { |
| panic!("isize::MAX shouldn't trigger an overflow!"); |
| } |
| if let Err(CapacityOverflow) = |
| ten_u32s.try_reserve_exact(MAX_CAP / 4 - 10).map_err(|e| e.kind()) |
| { |
| panic!("isize::MAX shouldn't trigger an overflow!"); |
| } |
| |
| assert_matches!( |
| ten_u32s.try_reserve_exact(MAX_CAP / 4 - 9).map_err(|e| e.kind()), |
| Err(CapacityOverflow), |
| "isize::MAX + 1 should trigger an overflow!" |
| ); |
| |
| assert_matches!( |
| ten_u32s.try_reserve_exact(MAX_USIZE - 20).map_err(|e| e.kind()), |
| Err(CapacityOverflow), |
| "usize::MAX should trigger an overflow!" |
| ); |
| } |
| } |
| |
| #[test] |
| fn test_stable_pointers() { |
| /// Pull an element from the iterator, then drop it. |
| /// Useful to cover both the `next` and `drop` paths of an iterator. |
| fn next_then_drop<I: Iterator>(mut i: I) { |
| i.next().unwrap(); |
| drop(i); |
| } |
| |
| // Test that, if we reserved enough space, adding and removing elements does not |
| // invalidate references into the vector (such as `v0`). This test also |
| // runs in Miri, which would detect such problems. |
| // Note that this test does *not* constitute a stable guarantee that all these functions do not |
| // reallocate! Only what is explicitly documented at |
| // <https://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#guarantees> is stably guaranteed. |
| let mut v = Vec::with_capacity(128); |
| v.push(13); |
| |
| // Laundering the lifetime -- we take care that `v` does not reallocate, so that's okay. |
| let v0 = &mut v[0]; |
| let v0 = unsafe { &mut *(v0 as *mut _) }; |
| // Now do a bunch of things and occasionally use `v0` again to assert it is still valid. |
| |
| // Pushing/inserting and popping/removing |
| v.push(1); |
| v.push(2); |
| v.insert(1, 1); |
| assert_eq!(*v0, 13); |
| v.remove(1); |
| v.pop().unwrap(); |
| assert_eq!(*v0, 13); |
| v.push(1); |
| v.swap_remove(1); |
| assert_eq!(v.len(), 2); |
| v.swap_remove(1); // swap_remove the last element |
| assert_eq!(*v0, 13); |
| |
| // Appending |
| v.append(&mut vec![27, 19]); |
| assert_eq!(*v0, 13); |
| |
| // Extending |
| v.extend_from_slice(&[1, 2]); |
| v.extend(&[1, 2]); // `slice::Iter` (with `T: Copy`) specialization |
| v.extend(vec![2, 3]); // `vec::IntoIter` specialization |
| v.extend(std::iter::once(3)); // `TrustedLen` specialization |
| v.extend(std::iter::empty::<i32>()); // `TrustedLen` specialization with empty iterator |
| v.extend(std::iter::once(3).filter(|_| true)); // base case |
| v.extend(std::iter::once(&3)); // `cloned` specialization |
| assert_eq!(*v0, 13); |
| |
| // Truncation |
| v.truncate(2); |
| assert_eq!(*v0, 13); |
| |
| // Resizing |
| v.resize_with(v.len() + 10, || 42); |
| assert_eq!(*v0, 13); |
| v.resize_with(2, || panic!()); |
| assert_eq!(*v0, 13); |
| |
| // No-op reservation |
| v.reserve(32); |
| v.reserve_exact(32); |
| assert_eq!(*v0, 13); |
| |
| // Partial draining |
| v.resize_with(10, || 42); |
| next_then_drop(v.drain(5..)); |
| assert_eq!(*v0, 13); |
| |
| // Splicing |
| v.resize_with(10, || 42); |
| next_then_drop(v.splice(5.., vec![1, 2, 3, 4, 5])); // empty tail after range |
| assert_eq!(*v0, 13); |
| next_then_drop(v.splice(5..8, vec![1])); // replacement is smaller than original range |
| assert_eq!(*v0, 13); |
| next_then_drop(v.splice(5..6, [1; 10].into_iter().filter(|_| true))); // lower bound not exact |
| assert_eq!(*v0, 13); |
| |
| // spare_capacity_mut |
| v.spare_capacity_mut(); |
| assert_eq!(*v0, 13); |
| |
| // Smoke test that would fire even outside Miri if an actual relocation happened. |
| // Also ensures the pointer is still writeable after all this. |
| *v0 -= 13; |
| assert_eq!(v[0], 0); |
| } |
| |
| // https://github.com/rust-lang/rust/pull/49496 introduced specialization based on: |
| // |
| // ``` |
| // unsafe impl<T: ?Sized> IsZero for *mut T { |
| // fn is_zero(&self) -> bool { |
| // (*self).is_null() |
| // } |
| // } |
| // ``` |
| // |
| // … to call `RawVec::with_capacity_zeroed` for creating `Vec<*mut T>`, |
| // which is incorrect for fat pointers since `<*mut T>::is_null` only looks at the data component. |
| // That is, a fat pointer can be “null” without being made entirely of zero bits. |
| #[test] |
| fn vec_macro_repeating_null_raw_fat_pointer() { |
| let raw_dyn = &mut (|| ()) as &mut dyn Fn() as *mut dyn Fn(); |
| let vtable = dbg!(ptr_metadata(raw_dyn)); |
| let null_raw_dyn = ptr_from_raw_parts(std::ptr::null_mut(), vtable); |
| assert!(null_raw_dyn.is_null()); |
| |
| let vec = vec![null_raw_dyn; 1]; |
| dbg!(ptr_metadata(vec[0])); |
| assert!(std::ptr::eq(vec[0], null_raw_dyn)); |
| |
| // Polyfill for https://github.com/rust-lang/rfcs/pull/2580 |
| |
| fn ptr_metadata(ptr: *mut dyn Fn()) -> *mut () { |
| unsafe { std::mem::transmute::<*mut dyn Fn(), DynRepr>(ptr).vtable } |
| } |
| |
| fn ptr_from_raw_parts(data: *mut (), vtable: *mut ()) -> *mut dyn Fn() { |
| unsafe { std::mem::transmute::<DynRepr, *mut dyn Fn()>(DynRepr { data, vtable }) } |
| } |
| |
| #[repr(C)] |
| struct DynRepr { |
| data: *mut (), |
| vtable: *mut (), |
| } |
| } |
| |
| // This test will likely fail if you change the capacities used in |
| // `RawVec::grow_amortized`. |
| #[test] |
| fn test_push_growth_strategy() { |
| // If the element size is 1, we jump from 0 to 8, then double. |
| { |
| let mut v1: Vec<u8> = vec![]; |
| assert_eq!(v1.capacity(), 0); |
| |
| for _ in 0..8 { |
| v1.push(0); |
| assert_eq!(v1.capacity(), 8); |
| } |
| |
| for _ in 8..16 { |
| v1.push(0); |
| assert_eq!(v1.capacity(), 16); |
| } |
| |
| for _ in 16..32 { |
| v1.push(0); |
| assert_eq!(v1.capacity(), 32); |
| } |
| |
| for _ in 32..64 { |
| v1.push(0); |
| assert_eq!(v1.capacity(), 64); |
| } |
| } |
| |
| // If the element size is 2..=1024, we jump from 0 to 4, then double. |
| { |
| let mut v2: Vec<u16> = vec![]; |
| let mut v1024: Vec<[u8; 1024]> = vec![]; |
| assert_eq!(v2.capacity(), 0); |
| assert_eq!(v1024.capacity(), 0); |
| |
| for _ in 0..4 { |
| v2.push(0); |
| v1024.push([0; 1024]); |
| assert_eq!(v2.capacity(), 4); |
| assert_eq!(v1024.capacity(), 4); |
| } |
| |
| for _ in 4..8 { |
| v2.push(0); |
| v1024.push([0; 1024]); |
| assert_eq!(v2.capacity(), 8); |
| assert_eq!(v1024.capacity(), 8); |
| } |
| |
| for _ in 8..16 { |
| v2.push(0); |
| v1024.push([0; 1024]); |
| assert_eq!(v2.capacity(), 16); |
| assert_eq!(v1024.capacity(), 16); |
| } |
| |
| for _ in 16..32 { |
| v2.push(0); |
| v1024.push([0; 1024]); |
| assert_eq!(v2.capacity(), 32); |
| assert_eq!(v1024.capacity(), 32); |
| } |
| |
| for _ in 32..64 { |
| v2.push(0); |
| v1024.push([0; 1024]); |
| assert_eq!(v2.capacity(), 64); |
| assert_eq!(v1024.capacity(), 64); |
| } |
| } |
| |
| // If the element size is > 1024, we jump from 0 to 1, then double. |
| { |
| let mut v1025: Vec<[u8; 1025]> = vec![]; |
| assert_eq!(v1025.capacity(), 0); |
| |
| for _ in 0..1 { |
| v1025.push([0; 1025]); |
| assert_eq!(v1025.capacity(), 1); |
| } |
| |
| for _ in 1..2 { |
| v1025.push([0; 1025]); |
| assert_eq!(v1025.capacity(), 2); |
| } |
| |
| for _ in 2..4 { |
| v1025.push([0; 1025]); |
| assert_eq!(v1025.capacity(), 4); |
| } |
| |
| for _ in 4..8 { |
| v1025.push([0; 1025]); |
| assert_eq!(v1025.capacity(), 8); |
| } |
| |
| for _ in 8..16 { |
| v1025.push([0; 1025]); |
| assert_eq!(v1025.capacity(), 16); |
| } |
| |
| for _ in 16..32 { |
| v1025.push([0; 1025]); |
| assert_eq!(v1025.capacity(), 32); |
| } |
| |
| for _ in 32..64 { |
| v1025.push([0; 1025]); |
| assert_eq!(v1025.capacity(), 64); |
| } |
| } |
| } |
| |
| macro_rules! generate_assert_eq_vec_and_prim { |
| ($name:ident<$B:ident>($type:ty)) => { |
| fn $name<A: PartialEq<$B> + Debug, $B: Debug>(a: Vec<A>, b: $type) { |
| assert!(a == b); |
| assert_eq!(a, b); |
| } |
| }; |
| } |
| |
| generate_assert_eq_vec_and_prim! { assert_eq_vec_and_slice <B>(&[B]) } |
| generate_assert_eq_vec_and_prim! { assert_eq_vec_and_array_3<B>([B; 3]) } |
| |
| #[test] |
| fn partialeq_vec_and_prim() { |
| assert_eq_vec_and_slice(vec![1, 2, 3], &[1, 2, 3]); |
| assert_eq_vec_and_array_3(vec![1, 2, 3], [1, 2, 3]); |
| } |
| |
| macro_rules! assert_partial_eq_valid { |
| ($a2:expr, $a3:expr; $b2:expr, $b3: expr) => { |
| assert!($a2 == $b2); |
| assert!($a2 != $b3); |
| assert!($a3 != $b2); |
| assert!($a3 == $b3); |
| assert_eq!($a2, $b2); |
| assert_ne!($a2, $b3); |
| assert_ne!($a3, $b2); |
| assert_eq!($a3, $b3); |
| }; |
| } |
| |
| #[test] |
| fn partialeq_vec_full() { |
| let vec2: Vec<_> = vec![1, 2]; |
| let vec3: Vec<_> = vec![1, 2, 3]; |
| let slice2: &[_] = &[1, 2]; |
| let slice3: &[_] = &[1, 2, 3]; |
| let slicemut2: &[_] = &mut [1, 2]; |
| let slicemut3: &[_] = &mut [1, 2, 3]; |
| let array2: [_; 2] = [1, 2]; |
| let array3: [_; 3] = [1, 2, 3]; |
| let arrayref2: &[_; 2] = &[1, 2]; |
| let arrayref3: &[_; 3] = &[1, 2, 3]; |
| |
| assert_partial_eq_valid!(vec2,vec3; vec2,vec3); |
| assert_partial_eq_valid!(vec2,vec3; slice2,slice3); |
| assert_partial_eq_valid!(vec2,vec3; slicemut2,slicemut3); |
| assert_partial_eq_valid!(slice2,slice3; vec2,vec3); |
| assert_partial_eq_valid!(slicemut2,slicemut3; vec2,vec3); |
| assert_partial_eq_valid!(vec2,vec3; array2,array3); |
| assert_partial_eq_valid!(vec2,vec3; arrayref2,arrayref3); |
| assert_partial_eq_valid!(vec2,vec3; arrayref2[..],arrayref3[..]); |
| } |
| |
| #[test] |
| fn test_vec_cycle() { |
| #[derive(Debug)] |
| struct C<'a> { |
| v: Vec<Cell<Option<&'a C<'a>>>>, |
| } |
| |
| impl<'a> C<'a> { |
| fn new() -> C<'a> { |
| C { v: Vec::new() } |
| } |
| } |
| |
| let mut c1 = C::new(); |
| let mut c2 = C::new(); |
| let mut c3 = C::new(); |
| |
| // Push |
| c1.v.push(Cell::new(None)); |
| c1.v.push(Cell::new(None)); |
| |
| c2.v.push(Cell::new(None)); |
| c2.v.push(Cell::new(None)); |
| |
| c3.v.push(Cell::new(None)); |
| c3.v.push(Cell::new(None)); |
| |
| // Set |
| c1.v[0].set(Some(&c2)); |
| c1.v[1].set(Some(&c3)); |
| |
| c2.v[0].set(Some(&c2)); |
| c2.v[1].set(Some(&c3)); |
| |
| c3.v[0].set(Some(&c1)); |
| c3.v[1].set(Some(&c2)); |
| } |
| |
| #[test] |
| fn test_vec_cycle_wrapped() { |
| struct Refs<'a> { |
| v: Vec<Cell<Option<&'a C<'a>>>>, |
| } |
| |
| struct C<'a> { |
| refs: Refs<'a>, |
| } |
| |
| impl<'a> Refs<'a> { |
| fn new() -> Refs<'a> { |
| Refs { v: Vec::new() } |
| } |
| } |
| |
| impl<'a> C<'a> { |
| fn new() -> C<'a> { |
| C { refs: Refs::new() } |
| } |
| } |
| |
| let mut c1 = C::new(); |
| let mut c2 = C::new(); |
| let mut c3 = C::new(); |
| |
| c1.refs.v.push(Cell::new(None)); |
| c1.refs.v.push(Cell::new(None)); |
| c2.refs.v.push(Cell::new(None)); |
| c2.refs.v.push(Cell::new(None)); |
| c3.refs.v.push(Cell::new(None)); |
| c3.refs.v.push(Cell::new(None)); |
| |
| c1.refs.v[0].set(Some(&c2)); |
| c1.refs.v[1].set(Some(&c3)); |
| c2.refs.v[0].set(Some(&c2)); |
| c2.refs.v[1].set(Some(&c3)); |
| c3.refs.v[0].set(Some(&c1)); |
| c3.refs.v[1].set(Some(&c2)); |
| } |
| |
| #[test] |
| fn test_zero_sized_capacity() { |
| for len in [0, 1, 2, 4, 8, 16, 32, 64, 128, 256] { |
| let v = Vec::<()>::with_capacity(len); |
| assert_eq!(v.len(), 0); |
| assert_eq!(v.capacity(), usize::MAX); |
| } |
| } |
| |
| #[test] |
| fn test_zero_sized_vec_push() { |
| const N: usize = 8; |
| |
| for len in 0..N { |
| let mut tester = Vec::with_capacity(len); |
| assert_eq!(tester.len(), 0); |
| assert!(tester.capacity() >= len); |
| for _ in 0..len { |
| tester.push(()); |
| } |
| assert_eq!(tester.len(), len); |
| assert_eq!(tester.iter().count(), len); |
| tester.clear(); |
| } |
| } |
| |
| #[test] |
| fn test_vec_macro_repeat() { |
| assert_eq!(vec![1; 3], vec![1, 1, 1]); |
| assert_eq!(vec![1; 2], vec![1, 1]); |
| assert_eq!(vec![1; 1], vec![1]); |
| assert_eq!(vec![1; 0], vec![]); |
| |
| // from_elem syntax (see RFC 832) |
| let el = Box::new(1); |
| let n = 3; |
| assert_eq!(vec![el; n], vec![Box::new(1), Box::new(1), Box::new(1)]); |
| } |
| |
| #[test] |
| fn test_vec_swap() { |
| let mut a: Vec<isize> = vec![0, 1, 2, 3, 4, 5, 6]; |
| a.swap(2, 4); |
| assert_eq!(a[2], 4); |
| assert_eq!(a[4], 2); |
| let mut n = 42; |
| swap(&mut n, &mut a[0]); |
| assert_eq!(a[0], 42); |
| assert_eq!(n, 0); |
| } |
| |
| #[test] |
| fn test_extend_from_within_spec() { |
| #[derive(Copy)] |
| struct CopyOnly; |
| |
| impl Clone for CopyOnly { |
| fn clone(&self) -> Self { |
| panic!("extend_from_within must use specialization on copy"); |
| } |
| } |
| |
| vec![CopyOnly, CopyOnly].extend_from_within(..); |
| } |
| |
| #[test] |
| fn test_extend_from_within_clone() { |
| let mut v = vec![String::from("sssss"), String::from("12334567890"), String::from("c")]; |
| v.extend_from_within(1..); |
| |
| assert_eq!(v, ["sssss", "12334567890", "c", "12334567890", "c"]); |
| } |
| |
| #[test] |
| fn test_extend_from_within_complete_rande() { |
| let mut v = vec![0, 1, 2, 3]; |
| v.extend_from_within(..); |
| |
| assert_eq!(v, [0, 1, 2, 3, 0, 1, 2, 3]); |
| } |
| |
| #[test] |
| fn test_extend_from_within_empty_rande() { |
| let mut v = vec![0, 1, 2, 3]; |
| v.extend_from_within(1..1); |
| |
| assert_eq!(v, [0, 1, 2, 3]); |
| } |
| |
| #[test] |
| #[should_panic] |
| fn test_extend_from_within_out_of_rande() { |
| let mut v = vec![0, 1]; |
| v.extend_from_within(..3); |
| } |
| |
| #[test] |
| fn test_extend_from_within_zst() { |
| let mut v = vec![(); 8]; |
| v.extend_from_within(3..7); |
| |
| assert_eq!(v, [(); 12]); |
| } |
| |
| #[test] |
| fn test_extend_from_within_empty_vec() { |
| let mut v = Vec::<i32>::new(); |
| v.extend_from_within(..); |
| |
| assert_eq!(v, []); |
| } |
| |
| #[test] |
| fn test_extend_from_within() { |
| let mut v = vec![String::from("a"), String::from("b"), String::from("c")]; |
| v.extend_from_within(1..=2); |
| v.extend_from_within(..=1); |
| |
| assert_eq!(v, ["a", "b", "c", "b", "c", "a", "b"]); |
| } |
| |
| #[test] |
| fn test_vec_dedup_by() { |
| let mut vec: Vec<i32> = vec![1, -1, 2, 3, 1, -5, 5, -2, 2]; |
| |
| vec.dedup_by(|a, b| a.abs() == b.abs()); |
| |
| assert_eq!(vec, [1, 2, 3, 1, -5, -2]); |
| } |
| |
| #[test] |
| fn test_vec_dedup_empty() { |
| let mut vec: Vec<i32> = Vec::new(); |
| |
| vec.dedup(); |
| |
| assert_eq!(vec, []); |
| } |
| |
| #[test] |
| fn test_vec_dedup_one() { |
| let mut vec = vec![12i32]; |
| |
| vec.dedup(); |
| |
| assert_eq!(vec, [12]); |
| } |
| |
| #[test] |
| fn test_vec_dedup_multiple_ident() { |
| let mut vec = vec![12, 12, 12, 12, 12, 11, 11, 11, 11, 11, 11]; |
| |
| vec.dedup(); |
| |
| assert_eq!(vec, [12, 11]); |
| } |
| |
| #[test] |
| fn test_vec_dedup_partialeq() { |
| #[derive(Debug)] |
| struct Foo(i32, #[allow(dead_code)] i32); |
| |
| impl PartialEq for Foo { |
| fn eq(&self, other: &Foo) -> bool { |
| self.0 == other.0 |
| } |
| } |
| |
| let mut vec = vec![Foo(0, 1), Foo(0, 5), Foo(1, 7), Foo(1, 9)]; |
| |
| vec.dedup(); |
| assert_eq!(vec, [Foo(0, 1), Foo(1, 7)]); |
| } |
| |
| #[test] |
| fn test_vec_dedup() { |
| let mut vec: Vec<bool> = Vec::with_capacity(8); |
| let mut template = vec.clone(); |
| |
| for x in 0u8..255u8 { |
| vec.clear(); |
| template.clear(); |
| |
| let iter = (0..8).map(move |bit| (x >> bit) & 1 == 1); |
| vec.extend(iter); |
| template.extend_from_slice(&vec); |
| |
| let (dedup, _) = template.partition_dedup(); |
| vec.dedup(); |
| |
| assert_eq!(vec, dedup); |
| } |
| } |
| |
| #[test] |
| #[cfg_attr(not(panic = "unwind"), ignore = "test requires unwinding support")] |
| fn test_vec_dedup_panicking() { |
| #[derive(Debug)] |
| struct Panic<'a> { |
| drop_counter: &'a Cell<u32>, |
| value: bool, |
| index: usize, |
| } |
| |
| impl<'a> PartialEq for Panic<'a> { |
| fn eq(&self, other: &Self) -> bool { |
| self.value == other.value |
| } |
| } |
| |
| impl<'a> Drop for Panic<'a> { |
| fn drop(&mut self) { |
| self.drop_counter.set(self.drop_counter.get() + 1); |
| if !std::thread::panicking() { |
| assert!(self.index != 4); |
| } |
| } |
| } |
| |
| let drop_counter = &Cell::new(0); |
| let expected = [ |
| Panic { drop_counter, value: false, index: 0 }, |
| Panic { drop_counter, value: false, index: 5 }, |
| Panic { drop_counter, value: true, index: 6 }, |
| Panic { drop_counter, value: true, index: 7 }, |
| ]; |
| let mut vec = vec![ |
| Panic { drop_counter, value: false, index: 0 }, |
| // these elements get deduplicated |
| Panic { drop_counter, value: false, index: 1 }, |
| Panic { drop_counter, value: false, index: 2 }, |
| Panic { drop_counter, value: false, index: 3 }, |
| Panic { drop_counter, value: false, index: 4 }, |
| // here it panics while dropping the item with index==4 |
| Panic { drop_counter, value: false, index: 5 }, |
| Panic { drop_counter, value: true, index: 6 }, |
| Panic { drop_counter, value: true, index: 7 }, |
| ]; |
| |
| let _ = catch_unwind(AssertUnwindSafe(|| vec.dedup())).unwrap_err(); |
| |
| assert_eq!(drop_counter.get(), 4); |
| |
| let ok = vec.iter().zip(expected.iter()).all(|(x, y)| x.index == y.index); |
| |
| if !ok { |
| panic!("expected: {expected:?}\ngot: {vec:?}\n"); |
| } |
| } |
| |
| // Regression test for issue #82533 |
| #[test] |
| #[cfg_attr(not(panic = "unwind"), ignore = "test requires unwinding support")] |
| fn test_extend_from_within_panicking_clone() { |
| struct Panic<'dc> { |
| drop_count: &'dc AtomicU32, |
| aaaaa: bool, |
| } |
| |
| impl Clone for Panic<'_> { |
| fn clone(&self) -> Self { |
| if self.aaaaa { |
| panic!("panic! at the clone"); |
| } |
| |
| Self { ..*self } |
| } |
| } |
| |
| impl Drop for Panic<'_> { |
| fn drop(&mut self) { |
| self.drop_count.fetch_add(1, Ordering::SeqCst); |
| } |
| } |
| |
| let count = core::sync::atomic::AtomicU32::new(0); |
| let mut vec = vec![ |
| Panic { drop_count: &count, aaaaa: false }, |
| Panic { drop_count: &count, aaaaa: true }, |
| Panic { drop_count: &count, aaaaa: false }, |
| ]; |
| |
| // This should clone&append one Panic{..} at the end, and then panic while |
| // cloning second Panic{..}. This means that `Panic::drop` should be called |
| // 4 times (3 for items already in vector, 1 for just appended). |
| // |
| // Previously just appended item was leaked, making drop_count = 3, instead of 4. |
| std::panic::catch_unwind(move || vec.extend_from_within(..)).unwrap_err(); |
| |
| assert_eq!(count.load(Ordering::SeqCst), 4); |
| } |
| |
| #[test] |
| #[should_panic = "vec len overflow"] |
| fn test_into_flattened_size_overflow() { |
| let v = vec![[(); usize::MAX]; 2]; |
| let _ = v.into_flattened(); |
| } |
| |
| #[test] |
| fn test_box_zero_allocator() { |
| use core::alloc::AllocError; |
| use core::cell::RefCell; |
| use std::collections::HashSet; |
| |
| // Track ZST allocations and ensure that they all have a matching free. |
| struct ZstTracker { |
| state: RefCell<(HashSet<usize>, usize)>, |
| } |
| unsafe impl Allocator for ZstTracker { |
| fn allocate(&self, layout: Layout) -> Result<NonNull<[u8]>, AllocError> { |
| let ptr = if layout.size() == 0 { |
| let mut state = self.state.borrow_mut(); |
| let addr = state.1; |
| assert!(state.0.insert(addr)); |
| state.1 += 1; |
| std::println!("allocating {addr}"); |
| std::ptr::without_provenance_mut(addr) |
| } else { |
| unsafe { std::alloc::alloc(layout) } |
| }; |
| Ok(NonNull::slice_from_raw_parts(NonNull::new(ptr).ok_or(AllocError)?, layout.size())) |
| } |
| |
| unsafe fn deallocate(&self, ptr: NonNull<u8>, layout: Layout) { |
| if layout.size() == 0 { |
| let addr = ptr.as_ptr() as usize; |
| let mut state = self.state.borrow_mut(); |
| std::println!("freeing {addr}"); |
| assert!(state.0.remove(&addr), "ZST free that wasn't allocated"); |
| } else { |
| unsafe { std::alloc::dealloc(ptr.as_ptr(), layout) } |
| } |
| } |
| } |
| |
| // Start the state at 100 to avoid returning null pointers. |
| let alloc = ZstTracker { state: RefCell::new((HashSet::new(), 100)) }; |
| |
| // Ensure that unsizing retains the same behavior. |
| { |
| let b1: Box<[u8; 0], &ZstTracker> = Box::new_in([], &alloc); |
| let b2: Box<[u8], &ZstTracker> = b1.clone(); |
| let _b3: Box<[u8], &ZstTracker> = b2.clone(); |
| } |
| |
| // Ensure that shrinking doesn't leak a ZST allocation. |
| { |
| let mut v1: Vec<u8, &ZstTracker> = Vec::with_capacity_in(100, &alloc); |
| v1.shrink_to_fit(); |
| } |
| |
| // Ensure that conversion to/from vec works. |
| { |
| let v1: Vec<(), &ZstTracker> = Vec::with_capacity_in(100, &alloc); |
| let _b1: Box<[()], &ZstTracker> = v1.into_boxed_slice(); |
| let b2: Box<[()], &ZstTracker> = Box::new_in([(), (), ()], &alloc); |
| let _v2: Vec<(), &ZstTracker> = b2.into(); |
| } |
| |
| // Ensure all ZSTs have been freed. |
| assert!(alloc.state.borrow().0.is_empty()); |
| } |
| |
| #[test] |
| fn test_vec_from_array_ref() { |
| assert_eq!(Vec::from(&[1, 2, 3]), vec![1, 2, 3]); |
| } |
| |
| #[test] |
| fn test_vec_from_array_mut_ref() { |
| assert_eq!(Vec::from(&mut [1, 2, 3]), vec![1, 2, 3]); |
| } |
| |
| #[test] |
| fn test_pop_if() { |
| let mut v = vec![1, 2, 3, 4]; |
| let pred = |x: &mut i32| *x % 2 == 0; |
| |
| assert_eq!(v.pop_if(pred), Some(4)); |
| assert_eq!(v, [1, 2, 3]); |
| |
| assert_eq!(v.pop_if(pred), None); |
| assert_eq!(v, [1, 2, 3]); |
| } |
| |
| #[test] |
| fn test_pop_if_empty() { |
| let mut v = Vec::<i32>::new(); |
| assert_eq!(v.pop_if(|_| true), None); |
| assert!(v.is_empty()); |
| } |
| |
| #[test] |
| fn test_pop_if_mutates() { |
| let mut v = vec![1]; |
| let pred = |x: &mut i32| { |
| *x += 1; |
| false |
| }; |
| assert_eq!(v.pop_if(pred), None); |
| assert_eq!(v, [2]); |
| } |
| |
| /// This assortment of tests, in combination with miri, verifies we handle UB on fishy arguments |
| /// in the stdlib. Draining and extending the allocation are fairly well-tested earlier, but |
| /// `vec.insert(usize::MAX, val)` once slipped by! |
| /// |
| /// All code that manipulates the collection types should be tested with "trivially wrong" args. |
| #[test] |
| fn max_dont_panic() { |
| let mut v = vec![0]; |
| let _ = v.get(usize::MAX); |
| v.shrink_to(usize::MAX); |
| v.truncate(usize::MAX); |
| } |
| |
| #[test] |
| #[should_panic] |
| fn max_insert() { |
| let mut v = vec![0]; |
| v.insert(usize::MAX, 1); |
| } |
| |
| #[test] |
| #[should_panic] |
| fn max_remove() { |
| let mut v = vec![0]; |
| v.remove(usize::MAX); |
| } |
| |
| #[test] |
| #[should_panic] |
| fn max_splice() { |
| let mut v = vec![0]; |
| v.splice(usize::MAX.., core::iter::once(1)); |
| } |
| |
| #[test] |
| #[should_panic] |
| fn max_swap_remove() { |
| let mut v = vec![0]; |
| v.swap_remove(usize::MAX); |
| } |
