Remove redundant imports of size_of

compiler/rustc_middle/src/query/erase.rs

@@ -4,7 +4,7 @@ use crate::traits;
 use crate::ty::adjustment::CoerceUnsizedInfo;
 use crate::ty::{self, Ty};
 use std::intrinsics::transmute_unchecked;
-use std::mem::{size_of, MaybeUninit};
+use std::mem::MaybeUninit;
 
 #[derive(Copy, Clone)]
 pub struct Erased<T: Copy> {

library/proc_macro/src/bridge/fxhash.rs

@@ -7,7 +7,6 @@
 use std::collections::HashMap;
 use std::hash::BuildHasherDefault;
 use std::hash::Hasher;
-use std::mem::size_of;
 use std::ops::BitXor;
 
 /// Type alias for a hashmap using the `fx` hash algorithm.

library/std/src/io/error/repr_bitpacked.rs

@@ -104,7 +104,7 @@
 
 use super::{Custom, ErrorData, ErrorKind, RawOsError, SimpleMessage};
 use core::marker::PhantomData;
-use core::mem::{align_of, size_of};
+use core::mem::align_of;
 use core::ptr::{self, NonNull};
 
 // The 2 least-significant bits are used as tag.

library/std/src/os/unix/net/ancillary.rs

@@ -3,7 +3,7 @@
 use super::{sockaddr_un, SocketAddr};
 use crate::io::{self, IoSlice, IoSliceMut};
 use crate::marker::PhantomData;
-use crate::mem::{size_of, zeroed};
+use crate::mem::zeroed;
 use crate::os::unix::io::RawFd;
 use crate::path::Path;
 use crate::ptr::{eq, read_unaligned};