Delete imports that are provided by 2021 edition prelude

Author: dtolnay

src/convert.rs

@@ -1,8 +1,6 @@
 pub(crate) fn usize_to_u32(u: usize) -> Option<u32> {
     #[cfg(not(no_try_from))]
     {
-        use core::convert::TryFrom;
-
         u32::try_from(u).ok()
     }
 

src/fallback.rs

@@ -8,7 +8,6 @@ use core::cell::RefCell;
 #[cfg(span_locations)]
 use core::cmp;
 use core::fmt::{self, Debug, Display, Write};
-use core::iter::FromIterator;
 use core::mem::ManuallyDrop;
 use core::ops::RangeBounds;
 use core::ptr;

src/lib.rs

@@ -151,7 +151,6 @@ use crate::marker::Marker;
 use core::cmp::Ordering;
 use core::fmt::{self, Debug, Display};
 use core::hash::{Hash, Hasher};
-use core::iter::FromIterator;
 use core::ops::RangeBounds;
 use core::str::FromStr;
 use std::error::Error;

src/wrapper.rs

@@ -3,7 +3,6 @@ use crate::detection::inside_proc_macro;
 use crate::location::LineColumn;
 use crate::{fallback, Delimiter, Punct, Spacing, TokenTree};
 use core::fmt::{self, Debug, Display};
-use core::iter::FromIterator;
 use core::ops::RangeBounds;
 use core::str::FromStr;
 use std::panic;

tests/test_fmt.rs

@@ -1,7 +1,7 @@
 #![allow(clippy::from_iter_instead_of_collect)]
 
 use proc_macro2::{Delimiter, Group, Ident, Span, TokenStream, TokenTree};
-use std::iter::{self, FromIterator};
+use std::iter;
 
 #[test]
 fn test_fmt_group() {