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Fix let_undescore_lock false-positive when binding without locking

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Signed-off-by: Klim Tsoutsman <klimusha@gmail.com>
This commit is contained in:
Klim Tsoutsman 2022-06-13 13:08:50 +10:00 committed by Klim Tsoutsman
parent 6b762ee330
commit 65f700fa89
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GPG Key ID: 65BBCF5B8416C884
4 changed files with 17 additions and 9 deletions
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7
clippy_lints/src/let_underscore.rs
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@ -99,12 +99,13 @@ declare_clippy_lint! {
declare_lint_pass!(LetUnderscore => [LET_UNDERSCORE_MUST_USE, LET_UNDERSCORE_LOCK, LET_UNDERSCORE_DROP]);
const SYNC_GUARD_PATHS: [&[&str]; 5] = [
const SYNC_GUARD_PATHS: [&[&str]; 6] = [
&paths::MUTEX_GUARD,
&paths::RWLOCK_READ_GUARD,
&paths::RWLOCK_WRITE_GUARD,
&paths::PARKING_LOT_RAWMUTEX,
&paths::PARKING_LOT_RAWRWLOCK,
&paths::PARKING_LOT_MUTEX_GUARD,
&paths::PARKING_LOT_RWLOCK_READ_GUARD,
&paths::PARKING_LOT_RWLOCK_WRITE_GUARD,
];
impl<'tcx> LateLintPass<'tcx> for LetUnderscore {

2
clippy_utils/src/paths.rs
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@ -84,8 +84,6 @@ pub const OPTION_SOME: [&str; 4] = ["core", "option", "Option", "Some"];
pub const ORD: [&str; 3] = ["core", "cmp", "Ord"];
pub const OS_STRING_AS_OS_STR: [&str; 5] = ["std", "ffi", "os_str", "OsString", "as_os_str"];
pub const OS_STR_TO_OS_STRING: [&str; 5] = ["std", "ffi", "os_str", "OsStr", "to_os_string"];
pub const PARKING_LOT_RAWMUTEX: [&str; 3] = ["parking_lot", "raw_mutex", "RawMutex"];
pub const PARKING_LOT_RAWRWLOCK: [&str; 3] = ["parking_lot", "raw_rwlock", "RawRwLock"];
pub const PARKING_LOT_MUTEX_GUARD: [&str; 3] = ["lock_api", "mutex", "MutexGuard"];
pub const PARKING_LOT_RWLOCK_READ_GUARD: [&str; 3] = ["lock_api", "rwlock", "RwLockReadGuard"];
pub const PARKING_LOT_RWLOCK_WRITE_GUARD: [&str; 3] = ["lock_api", "rwlock", "RwLockWriteGuard"];

9
tests/ui/let_underscore_lock.rs
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@ -13,6 +13,10 @@ fn main() {
let _ = rw.try_read();
let _ = rw.try_write();
// These shouldn't throw an error.
let _ = m;
let _ = rw;
use parking_lot::{lock_api::RawMutex, Mutex, RwLock};
let p_m: Mutex<()> = Mutex::const_new(RawMutex::INIT, ());
@ -24,4 +28,9 @@ fn main() {
let p_rw = RwLock::new(0);
let _ = p_rw.read();
let _ = p_rw.write();
// These shouldn't throw an error.
let _ = p_m;
let _ = p_m1;
let _ = p_rw;
}

8
tests/ui/let_underscore_lock.stderr
View File

@ -48,7 +48,7 @@ LL | let _ = rw.try_write();
= help: consider using an underscore-prefixed named binding or dropping explicitly with `std::mem::drop`
error: non-binding let on a synchronization lock
--> $DIR/let_underscore_lock.rs:19:5
--> $DIR/let_underscore_lock.rs:23:5
|
LL | let _ = p_m.lock();
| ^^^^^^^^^^^^^^^^^^^
@ -56,7 +56,7 @@ LL | let _ = p_m.lock();
= help: consider using an underscore-prefixed named binding or dropping explicitly with `std::mem::drop`
error: non-binding let on a synchronization lock
--> $DIR/let_underscore_lock.rs:22:5
--> $DIR/let_underscore_lock.rs:26:5
|
LL | let _ = p_m1.lock();
| ^^^^^^^^^^^^^^^^^^^^
@ -64,7 +64,7 @@ LL | let _ = p_m1.lock();
= help: consider using an underscore-prefixed named binding or dropping explicitly with `std::mem::drop`
error: non-binding let on a synchronization lock
--> $DIR/let_underscore_lock.rs:25:5
--> $DIR/let_underscore_lock.rs:29:5
|
LL | let _ = p_rw.read();
| ^^^^^^^^^^^^^^^^^^^^
@ -72,7 +72,7 @@ LL | let _ = p_rw.read();
= help: consider using an underscore-prefixed named binding or dropping explicitly with `std::mem::drop`
error: non-binding let on a synchronization lock
--> $DIR/let_underscore_lock.rs:26:5
--> $DIR/let_underscore_lock.rs:30:5
|
LL | let _ = p_rw.write();
| ^^^^^^^^^^^^^^^^^^^^^