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Auto merge of #8619 - pitaj:fix-6973, r=giraffate

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ignore `&x | &y` in unnested_or_patterns

replacing it with `&(x | y)` is actually more characters

Fixes #6973

changelog: [`unnested_or_patterns`] ignore `&x | &y`, nesting would result in more characters
This commit is contained in:
bors 2022-04-08 00:37:56 +00:00
commit a63308be0a
4 changed files with 38 additions and 28 deletions
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12
clippy_lints/src/unnested_or_patterns.rs
View file

@ -5,7 +5,7 @@ use clippy_utils::diagnostics::span_lint_and_then;
use clippy_utils::{meets_msrv, msrvs, over};
use rustc_ast::mut_visit::*;
use rustc_ast::ptr::P;
use rustc_ast::{self as ast, Pat, PatKind, PatKind::*, DUMMY_NODE_ID};
use rustc_ast::{self as ast, Mutability, Pat, PatKind, PatKind::*, DUMMY_NODE_ID};
use rustc_ast_pretty::pprust;
use rustc_errors::Applicability;
use rustc_lint::{EarlyContext, EarlyLintPass};
@ -230,6 +230,10 @@ fn transform_with_focus_on_idx(alternatives: &mut Vec<P<Pat>>, focus_idx: usize)
// with which a pattern `C(p_0)` may be formed,
// which we would want to join with other `C(p_j)`s.
Ident(.., None) | Lit(_) | Wild | Path(..) | Range(..) | Rest | MacCall(_)
// Skip immutable refs, as grouping them saves few characters,
// and almost always requires adding parens (increasing noisiness).
// In the case of only two patterns, replacement adds net characters.
| Ref(_, Mutability::Not)
// Dealt with elsewhere.
| Or(_) | Paren(_) => false,
// Transform `box x | ... | box y` into `box (x | y)`.
@ -241,10 +245,10 @@ fn transform_with_focus_on_idx(alternatives: &mut Vec<P<Pat>>, focus_idx: usize)
|k| matches!(k, Box(_)),
|k| always_pat!(k, Box(p) => p),
),
// Transform `&m x | ... | &m y` into `&m (x | y)`.
Ref(target, m1) => extend_with_matching(
// Transform `&mut x | ... | &mut y` into `&mut (x | y)`.
Ref(target, Mutability::Mut) => extend_with_matching(
target, start, alternatives,
|k| matches!(k, Ref(_, m2) if m1 == m2), // Mutabilities must match.
|k| matches!(k, Ref(_, Mutability::Mut)),
|k| always_pat!(k, Ref(p, _) => p),
),
// Transform `b @ p0 | ... b @ p1` into `b @ (p0 | p1)`.

7
tests/ui/unnested_or_patterns.fixed
View file

@ -6,10 +6,13 @@
#![allow(unreachable_patterns, irrefutable_let_patterns, unused_variables)]
fn main() {
// Should be ignored by this lint, as nesting requires more characters.
if let &0 | &2 = &0 {}
if let box (0 | 2) = Box::new(0) {}
if let box (0 | 1 | 2 | 3 | 4) = Box::new(0) {}
const C0: &u8 = &1;
if let &(0 | 2) | C0 = &0 {}
const C0: Option<u8> = Some(1);
if let Some(1 | 2) | C0 = None {}
if let &mut (0 | 2) = &mut 0 {}
if let x @ (0 | 2) = 0 {}
if let (0, 1 | 2 | 3) = (0, 0) {}

7
tests/ui/unnested_or_patterns.rs
View file

@ -6,10 +6,13 @@
#![allow(unreachable_patterns, irrefutable_let_patterns, unused_variables)]
fn main() {
// Should be ignored by this lint, as nesting requires more characters.
if let &0 | &2 = &0 {}
if let box 0 | box 2 = Box::new(0) {}
if let box ((0 | 1)) | box (2 | 3) | box 4 = Box::new(0) {}
const C0: &u8 = &1;
if let &0 | C0 | &2 = &0 {}
const C0: Option<u8> = Some(1);
if let Some(1) | C0 | Some(2) = None {}
if let &mut 0 | &mut 2 = &mut 0 {}
if let x @ 0 | x @ 2 = 0 {}
if let (0, 1) | (0, 2) | (0, 3) = (0, 0) {}

40
tests/ui/unnested_or_patterns.stderr
View file

@ -1,5 +1,5 @@
error: unnested or-patterns
--> $DIR/unnested_or_patterns.rs:9:12
--> $DIR/unnested_or_patterns.rs:12:12
|
LL | if let box 0 | box 2 = Box::new(0) {}
| ^^^^^^^^^^^^^
@ -11,7 +11,7 @@ LL | if let box (0 | 2) = Box::new(0) {}
| ~~~~~~~~~~~
error: unnested or-patterns
--> $DIR/unnested_or_patterns.rs:10:12
--> $DIR/unnested_or_patterns.rs:13:12
|
LL | if let box ((0 | 1)) | box (2 | 3) | box 4 = Box::new(0) {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@ -22,18 +22,18 @@ LL | if let box (0 | 1 | 2 | 3 | 4) = Box::new(0) {}
| ~~~~~~~~~~~~~~~~~~~~~~~
error: unnested or-patterns
--> $DIR/unnested_or_patterns.rs:12:12
--> $DIR/unnested_or_patterns.rs:15:12
|
LL | if let &0 | C0 | &2 = &0 {}
| ^^^^^^^^^^^^
LL | if let Some(1) | C0 | Some(2) = None {}
| ^^^^^^^^^^^^^^^^^^^^^^
|
help: nest the patterns
|
LL | if let &(0 | 2) | C0 = &0 {}
| ~~~~~~~~~~~~~
LL | if let Some(1 | 2) | C0 = None {}
| ~~~~~~~~~~~~~~~~
error: unnested or-patterns
--> $DIR/unnested_or_patterns.rs:13:12
--> $DIR/unnested_or_patterns.rs:16:12
|
LL | if let &mut 0 | &mut 2 = &mut 0 {}
| ^^^^^^^^^^^^^^^
@ -44,7 +44,7 @@ LL | if let &mut (0 | 2) = &mut 0 {}
| ~~~~~~~~~~~~
error: unnested or-patterns
--> $DIR/unnested_or_patterns.rs:14:12
--> $DIR/unnested_or_patterns.rs:17:12
|
LL | if let x @ 0 | x @ 2 = 0 {}
| ^^^^^^^^^^^^^
@ -55,7 +55,7 @@ LL | if let x @ (0 | 2) = 0 {}
| ~~~~~~~~~~~
error: unnested or-patterns
--> $DIR/unnested_or_patterns.rs:15:12
--> $DIR/unnested_or_patterns.rs:18:12
|
LL | if let (0, 1) | (0, 2) | (0, 3) = (0, 0) {}
| ^^^^^^^^^^^^^^^^^^^^^^^^
@ -66,7 +66,7 @@ LL | if let (0, 1 | 2 | 3) = (0, 0) {}
| ~~~~~~~~~~~~~~
error: unnested or-patterns
--> $DIR/unnested_or_patterns.rs:16:12
--> $DIR/unnested_or_patterns.rs:19:12
|
LL | if let (1, 0) | (2, 0) | (3, 0) = (0, 0) {}
| ^^^^^^^^^^^^^^^^^^^^^^^^
@ -77,7 +77,7 @@ LL | if let (1 | 2 | 3, 0) = (0, 0) {}
| ~~~~~~~~~~~~~~
error: unnested or-patterns
--> $DIR/unnested_or_patterns.rs:17:12
--> $DIR/unnested_or_patterns.rs:20:12
|
LL | if let (x, ..) | (x, 1) | (x, 2) = (0, 1) {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^
@ -88,7 +88,7 @@ LL | if let (x, ..) | (x, 1 | 2) = (0, 1) {}
| ~~~~~~~~~~~~~~~~~~~~
error: unnested or-patterns
--> $DIR/unnested_or_patterns.rs:18:12
--> $DIR/unnested_or_patterns.rs:21:12
|
LL | if let [0] | [1] = [0] {}
| ^^^^^^^^^
@ -99,7 +99,7 @@ LL | if let [0 | 1] = [0] {}
| ~~~~~~~
error: unnested or-patterns
--> $DIR/unnested_or_patterns.rs:19:12
--> $DIR/unnested_or_patterns.rs:22:12
|
LL | if let [x, 0] | [x, 1] = [0, 1] {}
| ^^^^^^^^^^^^^^^
@ -110,7 +110,7 @@ LL | if let [x, 0 | 1] = [0, 1] {}
| ~~~~~~~~~~
error: unnested or-patterns
--> $DIR/unnested_or_patterns.rs:20:12
--> $DIR/unnested_or_patterns.rs:23:12
|
LL | if let [x, 0] | [x, 1] | [x, 2] = [0, 1] {}
| ^^^^^^^^^^^^^^^^^^^^^^^^
@ -121,7 +121,7 @@ LL | if let [x, 0 | 1 | 2] = [0, 1] {}
| ~~~~~~~~~~~~~~
error: unnested or-patterns
--> $DIR/unnested_or_patterns.rs:21:12
--> $DIR/unnested_or_patterns.rs:24:12
|
LL | if let [x, ..] | [x, 1] | [x, 2] = [0, 1] {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^
@ -132,7 +132,7 @@ LL | if let [x, ..] | [x, 1 | 2] = [0, 1] {}
| ~~~~~~~~~~~~~~~~~~~~
error: unnested or-patterns
--> $DIR/unnested_or_patterns.rs:23:12
--> $DIR/unnested_or_patterns.rs:26:12
|
LL | if let TS(0, x) | TS(1, x) = TS(0, 0) {}
| ^^^^^^^^^^^^^^^^^^^
@ -143,7 +143,7 @@ LL | if let TS(0 | 1, x) = TS(0, 0) {}
| ~~~~~~~~~~~~
error: unnested or-patterns
--> $DIR/unnested_or_patterns.rs:24:12
--> $DIR/unnested_or_patterns.rs:27:12
|
LL | if let TS(1, 0) | TS(2, 0) | TS(3, 0) = TS(0, 0) {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@ -154,7 +154,7 @@ LL | if let TS(1 | 2 | 3, 0) = TS(0, 0) {}
| ~~~~~~~~~~~~~~~~
error: unnested or-patterns
--> $DIR/unnested_or_patterns.rs:25:12
--> $DIR/unnested_or_patterns.rs:28:12
|
LL | if let TS(x, ..) | TS(x, 1) | TS(x, 2) = TS(0, 0) {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@ -165,7 +165,7 @@ LL | if let TS(x, ..) | TS(x, 1 | 2) = TS(0, 0) {}
| ~~~~~~~~~~~~~~~~~~~~~~~~
error: unnested or-patterns
--> $DIR/unnested_or_patterns.rs:30:12
--> $DIR/unnested_or_patterns.rs:33:12
|
LL | if let S { x: 0, y } | S { y, x: 1 } = (S { x: 0, y: 1 }) {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^