Update rust edition

Author: paulocsanz

Cargo.toml

@@ -8,7 +8,7 @@ license = "MIT OR Apache-2.0"
 readme = "README.md"
 keywords = ["string", "generic", "array", "stack", "no_std"]
 categories = ["data-structures"]
-edition = "2018"
+edition = "2021"
 
 [lib]
 name = "arraystring"

benches/string.rs

@@ -1,7 +1,6 @@
 use arraystring::prelude::*;
 use criterion::{criterion_group, criterion_main, BenchmarkId, Criterion};
 use inlinable_string::{InlinableString, InlineString, StringExt};
-use std::convert::TryFrom;
 use std::time::Duration;
 
 const TIME: u64 = 500;

src/arraystring.rs

@@ -1,4 +1,5 @@
 //! `ArrayString` definition and Api implementation
+#![allow(clippy::len_without_is_empty)]
 
 use crate::arraystring::sealed::ValidCapacity;
 use crate::utils::{is_char_boundary, is_inside_boundary};

src/implementations.rs

@@ -2,7 +2,6 @@
 
 use crate::{arraystring::sealed::ValidCapacity, prelude::*};
 use core::fmt::{self, Debug, Display, Formatter, Write};
-use core::iter::FromIterator;
 use core::ops::{Add, Deref, DerefMut, Index, IndexMut};
 use core::ops::{Range, RangeFrom, RangeFull, RangeInclusive, RangeTo, RangeToInclusive};
 use core::str::{self, FromStr};

src/lib.rs

@@ -151,7 +151,6 @@ pub type MaxString = ArrayString<255>;
 mod cache_string {
     use crate::{prelude::*, Error};
     use core::fmt::{self, Debug, Display, Formatter, Write};
-    use core::iter::FromIterator;
     use core::{borrow::Borrow, borrow::BorrowMut, ops::*};
     use core::{cmp::Ordering, hash::Hash, hash::Hasher, str::FromStr};
 

tests/string_parity.rs

@@ -1,6 +1,6 @@
 use arraystring::prelude::*;
 use std::panic::{catch_unwind, AssertUnwindSafe, RefUnwindSafe};
-use std::{fmt::Debug, iter::FromIterator};
+use std::fmt::Debug;
 
 type TestString = ArrayString<255>;