Fix compilation errors with latest Rust nightly

.gitignore

@@ -0,0 +1 @@
+target/

doublets/src/data/traits.rs

@@ -2,7 +2,6 @@ use bumpalo::Bump;
 #[cfg(feature = "rayon")]
 use rayon::prelude::*;
 use std::{
-    default::default,
     ops::{ControlFlow, Try},
 };
 
@@ -79,7 +78,7 @@ pub trait Doublets<T: LinkType>: Links<T> {
     where
         Self: Sized,
     {
-        let mut index = default();
+        let mut index = Default::default();
         self.create_by_with(query, |_before, link| {
             index = link.index;
             Flow::Continue
@@ -165,7 +164,7 @@ pub trait Doublets<T: LinkType>: Links<T> {
     where
         Self: Sized,
     {
-        let mut result = default();
+        let mut result = Default::default();
         self.update_by_with(query, change, |_, after| {
             result = after.index;
             Flow::Continue
@@ -225,7 +224,7 @@ pub trait Doublets<T: LinkType>: Links<T> {
     where
         Self: Sized,
     {
-        let mut result = default();
+        let mut result = Default::default();
         self.delete_by_with(query, |_before, after| {
             result = after.index;
             Flow::Continue
@@ -347,7 +346,7 @@ pub trait Doublets<T: LinkType>: Links<T> {
         R: Try<Output = ()>,
         Self: Sized,
     {
-        let mut new = default();
+        let mut new = Default::default();
         let mut handler = Fuse::new(handler);
         self.create_with(|before, after| {
             new = after.index;
@@ -362,7 +361,7 @@ pub trait Doublets<T: LinkType>: Links<T> {
     where
         Self: Sized,
     {
-        let mut result = default();
+        let mut result = Default::default();
         self.create_link_with(source, target, |_, link| {
             result = link.index;
             Flow::Continue
@@ -653,7 +652,7 @@ impl<T: LinkType, All: Doublets<T> + Sized> DoubletsExt<T> for All {
         self.each_iter([self.constants().any; 3])
     }
 
-    type ImplIterEach = impl Iterator<Item = Link<T>> + ExactSizeIterator + DoubleEndedIterator;
+    type ImplIterEach = std::vec::IntoIter<Link<T>>;
 
     #[cfg_attr(feature = "more-inline", inline)]
     fn each_iter(&self, query: impl ToQuery<T>) -> Self::ImplIterEach {
@@ -677,8 +676,7 @@ impl<T: LinkType, All: Doublets<T> + Sized> DoubletsExt<T> for All {
     }
 
     #[cfg(feature = "small-search")]
-    type ImplIterEachSmall =
-        impl Iterator<Item = Link<T>> + ExactSizeIterator + DoubleEndedIterator;
+    type ImplIterEachSmall = std::vec::IntoIter<Link<T>>;
 
     #[cfg(feature = "small-search")]
     #[cfg_attr(feature = "more-inline", inline)]

doublets/src/lib.rs

@@ -1,15 +1,12 @@
 #![feature(fn_traits)]
-#![feature(generators)]
+#![feature(coroutines)]
 #![feature(try_trait_v2)]
-#![feature(default_free_fn)]
 #![feature(unboxed_closures)]
-#![feature(nonnull_slice_from_raw_parts)]
 #![feature(associated_type_defaults)]
 #![feature(type_alias_impl_trait)]
-#![feature(maybe_uninit_uninit_array)]
 #![feature(allocator_api)]
-#![feature(bench_black_box)]
 #![feature(maybe_uninit_array_assume_init)]
+#![feature(impl_trait_in_assoc_type)]
 #![cfg_attr(not(test), forbid(clippy::unwrap_used))]
 #![warn(
     clippy::perf,

doublets/src/mem/split/store.rs

@@ -1,4 +1,4 @@
-use std::{cmp::Ordering, default::default, error::Error, mem::transmute, ptr::NonNull};
+use std::{cmp::Ordering, mem::transmute, ptr::NonNull};
 
 use crate::{
     mem::{
@@ -109,7 +109,7 @@ impl<
     }
 
     pub fn new(data_mem: MD, index_mem: MI) -> Result<Store<T, MD, MI>, LinksError<T>> {
-        Self::with_constants(data_mem, index_mem, default())
+        Self::with_constants(data_mem, index_mem, Default::default())
     }
 
     fn mut_from_mem<'a, U>(mut ptr: NonNull<[U]>, index: usize) -> Option<&'a mut U> {

doublets/src/mem/unit/generic/links_recursionless_size_balanced_tree_base.rs

@@ -1,4 +1,4 @@
-use std::{default::default, marker::PhantomData, ptr::NonNull};
+use std::{marker::PhantomData, ptr::NonNull};
 
 use crate::{
     mem::{header::LinksHeader, unit::raw_link::LinkPart, LinksTree},
@@ -22,7 +22,7 @@ impl<T: LinkType> LinksRecursionlessSizeBalancedTreeBase<T> {
             mem,
             r#break: constants.r#break,
             r#continue: constants.r#continue,
-            _phantom: default(),
+            _phantom: Default::default(),
         }
     }
 }