Add blank lines after module-level //! comments.

Most modules have such a blank line, but some don't. Inserting the blank
line makes it clearer that the `//!` comments are describing the entire
module, rather than the `use` declaration(s) that immediately follows.

Author: nnethercote

alloc/src/vec/in_place_collect.rs

@@ -154,6 +154,7 @@
 //! }
 //! vec.truncate(write_idx);
 //! ```
+
 use crate::alloc::{handle_alloc_error, Global};
 use core::alloc::Allocator;
 use core::alloc::Layout;

core/src/str/count.rs

@@ -17,6 +17,7 @@
 //! Note: Because the term "leading byte" can sometimes be ambiguous (for
 //! example, it could also refer to the first byte of a slice), we'll often use
 //! the term "non-continuation byte" to refer to these bytes in the code.
+
 use core::intrinsics::unlikely;
 
 const USIZE_SIZE: usize = core::mem::size_of::<usize>();

core/tests/iter/adapters/map_windows.rs

@@ -3,6 +3,7 @@ use std::sync::atomic::{AtomicUsize, Ordering::SeqCst};
 #[cfg(not(panic = "abort"))]
 mod drop_checks {
     //! These tests mainly make sure the elements are correctly dropped.
+
     use std::sync::atomic::{AtomicBool, AtomicUsize, Ordering::SeqCst};
 
     #[derive(Debug)]

core/tests/num/ieee754.rs

@@ -27,6 +27,7 @@
 //! standard. That is why they accept wildly diverse inputs or may seem to duplicate other tests.
 //! Please consider this carefully when adding, removing, or reorganizing these tests. They are
 //! here so that it is clear what tests are required by the standard and what can be changed.
+
 use ::core::str::FromStr;
 
 // IEEE 754 for many tests is applied to specific bit patterns.

panic_unwind/src/miri.rs

@@ -1,4 +1,5 @@
 //! Unwinding panics for Miri.
+
 use alloc::boxed::Box;
 use core::any::Any;
 

portable-simd/crates/core_simd/src/ops/assign.rs

@@ -1,4 +1,5 @@
 //! Assignment operators
+
 use super::*;
 use core::ops::{AddAssign, MulAssign}; // commutative binary op-assignment
 use core::ops::{BitAndAssign, BitOrAssign, BitXorAssign}; // commutative bit binary op-assignment

portable-simd/crates/core_simd/src/ops/deref.rs

@@ -2,6 +2,7 @@
 //! Ideally, Rust would take care of this itself,
 //! and method calls usually handle the LHS implicitly.
 //! But this is not the case with arithmetic ops.
+
 use super::*;
 
 macro_rules! deref_lhs {

std/src/hash/random.rs

@@ -6,6 +6,7 @@
 //! outside this crate.
 //!
 //! [`collections`]: crate::collections
+
 #[allow(deprecated)]
 use super::{BuildHasher, Hasher, SipHasher13};
 use crate::cell::Cell;

std/src/sys/pal/itron/thread.rs

@@ -1,5 +1,6 @@
 //! Thread implementation backed by μITRON tasks. Assumes `acre_tsk` and
 //! `exd_tsk` are available.
+
 use super::{
     abi,
     error::{expect_success, expect_success_aborting, ItronError},

std/src/sys/pal/solid/abi/fs.rs

@@ -1,4 +1,5 @@
 //! `solid_fs.h`
+
 use crate::os::raw::{c_char, c_int, c_uchar};
 pub use libc::{
     ino_t, off_t, stat, time_t, O_APPEND, O_CREAT, O_EXCL, O_RDONLY, O_RDWR, O_TRUNC, O_WRONLY,

std/src/sys/pal/unix/process/process_unsupported/wait_status.rs

@@ -1,6 +1,7 @@
 //! Emulated wait status for non-Unix #[cfg(unix) platforms
 //!
 //! Separate module to facilitate testing against a real Unix implementation.
+
 use crate::ffi::c_int;
 use crate::fmt;
 use crate::num::NonZero;

std/src/sys/pal/unix/thread.rs

@@ -475,6 +475,7 @@ mod cgroups {
     //! * cgroup v2 in non-standard mountpoints
     //! * paths containing control characters or spaces, since those would be escaped in procfs
     //!   output and we don't unescape
+
     use crate::borrow::Cow;
     use crate::ffi::OsString;
     use crate::fs::{try_exists, File};

std/src/sys/sync/condvar/itron.rs

@@ -1,4 +1,5 @@
 //! POSIX conditional variable implementation based on user-space wait queues.
+
 use crate::sys::pal::itron::{
     abi, error::expect_success_aborting, spin::SpinMutex, task, time::with_tmos_strong,
 };

std/src/sys/sync/mutex/itron.rs

@@ -1,5 +1,6 @@
 //! Mutex implementation backed by μITRON mutexes. Assumes `acre_mtx` and
 //! `TA_INHERIT` are available.
+
 use crate::sys::pal::itron::{
     abi,
     error::{expect_success, expect_success_aborting, fail, ItronError},

std/src/sys/sync/rwlock/solid.rs

@@ -1,4 +1,5 @@
 //! A readers-writer lock implementation backed by the SOLID kernel extension.
+
 use crate::sys::pal::{
     abi,
     itron::{

std/tests/create_dir_all_bare.rs

@@ -2,6 +2,7 @@
 
 //! Note that this test changes the current directory so
 //! should not be in the same process as other tests.
+
 use std::env;
 use std::fs;
 use std::path::{Path, PathBuf};

test/src/bench.rs

@@ -1,4 +1,5 @@
 //! Benchmarking module.
+
 use super::{
     event::CompletedTest,
     options::BenchMode,

test/src/helpers/concurrency.rs

@@ -1,5 +1,6 @@
 //! Helper module which helps to determine amount of threads to be used
 //! during tests execution.
+
 use std::{env, num::NonZero, thread};
 
 pub fn get_concurrency() -> usize {

test/src/helpers/metrics.rs

@@ -1,4 +1,5 @@
 //! Benchmark metrics.
+
 use std::collections::BTreeMap;
 
 #[derive(Clone, PartialEq, Debug, Copy)]