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feature(box_syntax)
#[allow(unused_allocation)]
#[allow()]
unused_allocation
Box::new
feature("atomic_from_ptr")
//
ptr_mask
Atomic*::from_ptr
then
then_some
if $c:expr { Some($r:expr) } else { None }
$c.then(|| $r)
ty::AssocItem
arena_cache
Copy
upstream_monomorphizations_for
rust_2018
!is_rust_2015
rust_2015
is_rust_2015
is_exit
Edition
.edition().rust_*()
_ == _ || _ == _
matches!(_, _ | _)
Mutability::{is_mut, is_not}
==
match
#[allow(dead_code)]
has_allow_dead_code_or_lang_attr
TraitItemKind::expect_type