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Adjust Clippy for CONST_ITEM_MUTATION lint

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We no longer lint assignments to const item fields in the
`temporary_assignment` lint, since this is now covered by the
`CONST_ITEM_MUTATION` lint.

Additionally, we `#![allow(const_item_mutation)]` in the
`borrow_interior_mutable_const.rs` test. Clippy UI tests are run with
`-D warnings`, which seems to cause builtin lints to prevent Clippy
lints from running.
This commit is contained in:
Aaron Hill 2020-09-08 17:59:43 -04:00
parent 4286d9c87a
commit f23670ed68
5 changed files with 24 additions and 48 deletions
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4
clippy_lints/src/temporary_assignment.rs
View File

@ -1,5 +1,4 @@
use crate::utils::{is_adjusted, span_lint};
use rustc_hir::def::{DefKind, Res};
use rustc_hir::{Expr, ExprKind};
use rustc_lint::{LateContext, LateLintPass};
use rustc_session::{declare_lint_pass, declare_tool_lint};
@ -22,10 +21,9 @@ declare_clippy_lint! {
"assignments to temporaries"
}
fn is_temporary(cx: &LateContext<'_>, expr: &Expr<'_>) -> bool {
fn is_temporary(_cx: &LateContext<'_>, expr: &Expr<'_>) -> bool {
match &expr.kind {
ExprKind::Struct(..) | ExprKind::Tup(..) => true,
ExprKind::Path(qpath) => matches!(cx.qpath_res(qpath, expr.hir_id), Res::Def(DefKind::Const, ..)),
_ => false,
}
}

1
tests/ui/borrow_interior_mutable_const.rs
View File

@ -1,5 +1,6 @@
#![warn(clippy::borrow_interior_mutable_const)]
#![allow(clippy::declare_interior_mutable_const, clippy::ref_in_deref)]
#![allow(const_item_mutation)]
use std::borrow::Cow;
use std::cell::{Cell, UnsafeCell};

32
tests/ui/borrow_interior_mutable_const.stderr
View File

@ -1,5 +1,5 @@
error: a `const` item with interior mutability should not be borrowed
--> $DIR/borrow_interior_mutable_const.rs:65:5
--> $DIR/borrow_interior_mutable_const.rs:66:5
|
LL | ATOMIC.store(1, Ordering::SeqCst); //~ ERROR interior mutability
| ^^^^^^
@ -8,7 +8,7 @@ LL | ATOMIC.store(1, Ordering::SeqCst); //~ ERROR interior mutability
= help: assign this const to a local or static variable, and use the variable here
error: a `const` item with interior mutability should not be borrowed
--> $DIR/borrow_interior_mutable_const.rs:66:16
--> $DIR/borrow_interior_mutable_const.rs:67:16
|
LL | assert_eq!(ATOMIC.load(Ordering::SeqCst), 5); //~ ERROR interior mutability
| ^^^^^^
@ -16,7 +16,7 @@ LL | assert_eq!(ATOMIC.load(Ordering::SeqCst), 5); //~ ERROR interior mutabi
= help: assign this const to a local or static variable, and use the variable here
error: a `const` item with interior mutability should not be borrowed
--> $DIR/borrow_interior_mutable_const.rs:69:22
--> $DIR/borrow_interior_mutable_const.rs:70:22
|
LL | let _once_ref = &ONCE_INIT; //~ ERROR interior mutability
| ^^^^^^^^^
@ -24,7 +24,7 @@ LL | let _once_ref = &ONCE_INIT; //~ ERROR interior mutability
= help: assign this const to a local or static variable, and use the variable here
error: a `const` item with interior mutability should not be borrowed
--> $DIR/borrow_interior_mutable_const.rs:70:25
--> $DIR/borrow_interior_mutable_const.rs:71:25
|
LL | let _once_ref_2 = &&ONCE_INIT; //~ ERROR interior mutability
| ^^^^^^^^^
@ -32,7 +32,7 @@ LL | let _once_ref_2 = &&ONCE_INIT; //~ ERROR interior mutability
= help: assign this const to a local or static variable, and use the variable here
error: a `const` item with interior mutability should not be borrowed
--> $DIR/borrow_interior_mutable_const.rs:71:27
--> $DIR/borrow_interior_mutable_const.rs:72:27
|
LL | let _once_ref_4 = &&&&ONCE_INIT; //~ ERROR interior mutability
| ^^^^^^^^^
@ -40,7 +40,7 @@ LL | let _once_ref_4 = &&&&ONCE_INIT; //~ ERROR interior mutability
= help: assign this const to a local or static variable, and use the variable here
error: a `const` item with interior mutability should not be borrowed
--> $DIR/borrow_interior_mutable_const.rs:72:26
--> $DIR/borrow_interior_mutable_const.rs:73:26
|
LL | let _once_mut = &mut ONCE_INIT; //~ ERROR interior mutability
| ^^^^^^^^^
@ -48,7 +48,7 @@ LL | let _once_mut = &mut ONCE_INIT; //~ ERROR interior mutability
= help: assign this const to a local or static variable, and use the variable here
error: a `const` item with interior mutability should not be borrowed
--> $DIR/borrow_interior_mutable_const.rs:83:14
--> $DIR/borrow_interior_mutable_const.rs:84:14
|
LL | let _ = &ATOMIC_TUPLE; //~ ERROR interior mutability
| ^^^^^^^^^^^^
@ -56,7 +56,7 @@ LL | let _ = &ATOMIC_TUPLE; //~ ERROR interior mutability
= help: assign this const to a local or static variable, and use the variable here
error: a `const` item with interior mutability should not be borrowed
--> $DIR/borrow_interior_mutable_const.rs:84:14
--> $DIR/borrow_interior_mutable_const.rs:85:14
|
LL | let _ = &ATOMIC_TUPLE.0; //~ ERROR interior mutability
| ^^^^^^^^^^^^
@ -64,7 +64,7 @@ LL | let _ = &ATOMIC_TUPLE.0; //~ ERROR interior mutability
= help: assign this const to a local or static variable, and use the variable here
error: a `const` item with interior mutability should not be borrowed
--> $DIR/borrow_interior_mutable_const.rs:85:19
--> $DIR/borrow_interior_mutable_const.rs:86:19
|
LL | let _ = &(&&&&ATOMIC_TUPLE).0; //~ ERROR interior mutability
| ^^^^^^^^^^^^
@ -72,7 +72,7 @@ LL | let _ = &(&&&&ATOMIC_TUPLE).0; //~ ERROR interior mutability
= help: assign this const to a local or static variable, and use the variable here
error: a `const` item with interior mutability should not be borrowed
--> $DIR/borrow_interior_mutable_const.rs:86:14
--> $DIR/borrow_interior_mutable_const.rs:87:14
|
LL | let _ = &ATOMIC_TUPLE.0[0]; //~ ERROR interior mutability
| ^^^^^^^^^^^^
@ -80,7 +80,7 @@ LL | let _ = &ATOMIC_TUPLE.0[0]; //~ ERROR interior mutability
= help: assign this const to a local or static variable, and use the variable here
error: a `const` item with interior mutability should not be borrowed
--> $DIR/borrow_interior_mutable_const.rs:87:13
--> $DIR/borrow_interior_mutable_const.rs:88:13
|
LL | let _ = ATOMIC_TUPLE.0[0].load(Ordering::SeqCst); //~ ERROR interior mutability
| ^^^^^^^^^^^^
@ -88,7 +88,7 @@ LL | let _ = ATOMIC_TUPLE.0[0].load(Ordering::SeqCst); //~ ERROR interior mu
= help: assign this const to a local or static variable, and use the variable here
error: a `const` item with interior mutability should not be borrowed
--> $DIR/borrow_interior_mutable_const.rs:93:13
--> $DIR/borrow_interior_mutable_const.rs:94:13
|
LL | let _ = ATOMIC_TUPLE.0[0]; //~ ERROR interior mutability
| ^^^^^^^^^^^^
@ -96,7 +96,7 @@ LL | let _ = ATOMIC_TUPLE.0[0]; //~ ERROR interior mutability
= help: assign this const to a local or static variable, and use the variable here
error: a `const` item with interior mutability should not be borrowed
--> $DIR/borrow_interior_mutable_const.rs:98:5
--> $DIR/borrow_interior_mutable_const.rs:99:5
|
LL | CELL.set(2); //~ ERROR interior mutability
| ^^^^
@ -104,7 +104,7 @@ LL | CELL.set(2); //~ ERROR interior mutability
= help: assign this const to a local or static variable, and use the variable here
error: a `const` item with interior mutability should not be borrowed
--> $DIR/borrow_interior_mutable_const.rs:99:16
--> $DIR/borrow_interior_mutable_const.rs:100:16
|
LL | assert_eq!(CELL.get(), 6); //~ ERROR interior mutability
| ^^^^
@ -112,7 +112,7 @@ LL | assert_eq!(CELL.get(), 6); //~ ERROR interior mutability
= help: assign this const to a local or static variable, and use the variable here
error: a `const` item with interior mutability should not be borrowed
--> $DIR/borrow_interior_mutable_const.rs:112:5
--> $DIR/borrow_interior_mutable_const.rs:113:5
|
LL | u64::ATOMIC.store(5, Ordering::SeqCst); //~ ERROR interior mutability
| ^^^^^^^^^^^
@ -120,7 +120,7 @@ LL | u64::ATOMIC.store(5, Ordering::SeqCst); //~ ERROR interior mutability
= help: assign this const to a local or static variable, and use the variable here
error: a `const` item with interior mutability should not be borrowed
--> $DIR/borrow_interior_mutable_const.rs:113:16
--> $DIR/borrow_interior_mutable_const.rs:114:16
|
LL | assert_eq!(u64::ATOMIC.load(Ordering::SeqCst), 9); //~ ERROR interior mutability
| ^^^^^^^^^^^

1
tests/ui/temporary_assignment.rs
View File

@ -1,4 +1,5 @@
#![warn(clippy::temporary_assignment)]
#![allow(const_item_mutation)]
use std::ops::{Deref, DerefMut};

34
tests/ui/temporary_assignment.stderr
View File

@ -1,5 +1,5 @@
error: assignment to temporary
--> $DIR/temporary_assignment.rs:47:5
--> $DIR/temporary_assignment.rs:48:5
|
LL | Struct { field: 0 }.field = 1;
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@ -7,7 +7,7 @@ LL | Struct { field: 0 }.field = 1;
= note: `-D clippy::temporary-assignment` implied by `-D warnings`
error: assignment to temporary
--> $DIR/temporary_assignment.rs:48:5
--> $DIR/temporary_assignment.rs:49:5
|
LL | / MultiStruct {
LL | | structure: Struct { field: 0 },
@ -17,40 +17,16 @@ LL | | .field = 1;
| |______________^
error: assignment to temporary
--> $DIR/temporary_assignment.rs:53:5
--> $DIR/temporary_assignment.rs:54:5
|
LL | ArrayStruct { array: [0] }.array[0] = 1;
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: assignment to temporary
--> $DIR/temporary_assignment.rs:54:5
--> $DIR/temporary_assignment.rs:55:5
|
LL | (0, 0).0 = 1;
| ^^^^^^^^^^^^
error: assignment to temporary
--> $DIR/temporary_assignment.rs:56:5
|
LL | A.0 = 2;
| ^^^^^^^
error: assignment to temporary
--> $DIR/temporary_assignment.rs:57:5
|
LL | B.field = 2;
| ^^^^^^^^^^^
error: assignment to temporary
--> $DIR/temporary_assignment.rs:58:5
|
LL | C.structure.field = 2;
| ^^^^^^^^^^^^^^^^^^^^^
error: assignment to temporary
--> $DIR/temporary_assignment.rs:59:5
|
LL | D.array[0] = 2;
| ^^^^^^^^^^^^^^
error: aborting due to 8 previous errors
error: aborting due to 4 previous errors