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Try to fix warning for unused variables in or patterns, issue #67691

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This commit is contained in:
sapir 2020-01-01 01:20:34 +02:00
parent 0c156af20d
commit e22e443208
8 changed files with 139 additions and 56 deletions
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12
src/test/ui/lint/issue-47390-unused-variable-in-struct-pattern.stderr
View file

@ -12,16 +12,16 @@ LL | #![warn(unused)] // UI tests pass `-A unused` (#43896)
= note: `#[warn(unused_variables)]` implied by `#[warn(unused)]`
warning: unused variable: `mut_unused_var`
--> $DIR/issue-47390-unused-variable-in-struct-pattern.rs:33:13
--> $DIR/issue-47390-unused-variable-in-struct-pattern.rs:33:9
|
LL | let mut mut_unused_var = 1;
| ^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_mut_unused_var`
| ^^^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_mut_unused_var`
warning: unused variable: `var`
--> $DIR/issue-47390-unused-variable-in-struct-pattern.rs:37:14
--> $DIR/issue-47390-unused-variable-in-struct-pattern.rs:37:10
|
LL | let (mut var, unused_var) = (1, 2);
| ^^^ help: if this is intentional, prefix it with an underscore: `_var`
| ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_var`
warning: unused variable: `unused_var`
--> $DIR/issue-47390-unused-variable-in-struct-pattern.rs:37:19
@ -36,10 +36,10 @@ LL | if let SoulHistory { corridors_of_light,
| ^^^^^^^^^^^^^^^^^^ help: try ignoring the field: `corridors_of_light: _`
warning: variable `hours_are_suns` is assigned to, but never used
--> $DIR/issue-47390-unused-variable-in-struct-pattern.rs:46:30
--> $DIR/issue-47390-unused-variable-in-struct-pattern.rs:46:26
|
LL | mut hours_are_suns,
| ^^^^^^^^^^^^^^
| ^^^^^^^^^^^^^^^^^^
|
= note: consider using `_hours_are_suns` instead

18
src/test/ui/lint/issue-54180-unused-ref-field.stderr
View file

@ -1,10 +1,8 @@
error: unused variable: `field`
--> $DIR/issue-54180-unused-ref-field.rs:20:26
--> $DIR/issue-54180-unused-ref-field.rs:20:22
|
LL | E::Variant { ref field } => (),
| ----^^^^^
| |
| help: try ignoring the field: `field: _`
| ^^^^^^^^^ help: try ignoring the field: `field: _`
|
note: the lint level is defined here
--> $DIR/issue-54180-unused-ref-field.rs:3:9
@ -20,20 +18,16 @@ LL | let _: i32 = points.iter().map(|Point { x, y }| y).sum();
| ^ help: try ignoring the field: `x: _`
error: unused variable: `f1`
--> $DIR/issue-54180-unused-ref-field.rs:26:17
--> $DIR/issue-54180-unused-ref-field.rs:26:13
|
LL | let S { ref f1 } = s;
| ----^^
| |
| help: try ignoring the field: `f1: _`
| ^^^^^^ help: try ignoring the field: `f1: _`
error: unused variable: `x`
--> $DIR/issue-54180-unused-ref-field.rs:32:28
--> $DIR/issue-54180-unused-ref-field.rs:32:20
|
LL | Point { y, ref mut x } => y,
| --------^
| |
| help: try ignoring the field: `x: _`
| ^^^^^^^^^ help: try ignoring the field: `x: _`
error: aborting due to 4 previous errors

24
src/test/ui/lint/issue-67691-unused-field-in-or-pattern.fixed
View file

@ -8,6 +8,11 @@ pub enum MyEnum {
B { i: i32, j: i32 },
}
pub enum MixedEnum {
A { i: i32 },
B(i32),
}
pub fn no_ref(x: MyEnum) {
use MyEnum::*;
@ -52,10 +57,29 @@ pub fn inner_with_ref(x: Option<MyEnum>) {
}
}
pub fn mixed_no_ref(x: MixedEnum) {
match x {
MixedEnum::A { i: _ } | MixedEnum::B(_i) => {
println!("match");
}
}
}
pub fn mixed_with_ref(x: MixedEnum) {
match x {
MixedEnum::A { i: _ } | MixedEnum::B(_i) => {
println!("match");
}
}
}
pub fn main() {
no_ref(MyEnum::A { i: 1, j: 2 });
with_ref(MyEnum::A { i: 1, j: 2 });
inner_no_ref(Some(MyEnum::A { i: 1, j: 2 }));
inner_with_ref(Some(MyEnum::A { i: 1, j: 2 }));
mixed_no_ref(MixedEnum::B(5));
mixed_with_ref(MixedEnum::B(5));
}

24
src/test/ui/lint/issue-67691-unused-field-in-or-pattern.rs
View file

@ -8,6 +8,11 @@ pub enum MyEnum {
B { i: i32, j: i32 },
}
pub enum MixedEnum {
A { i: i32 },
B(i32),
}
pub fn no_ref(x: MyEnum) {
use MyEnum::*;
@ -52,10 +57,29 @@ pub fn inner_with_ref(x: Option<MyEnum>) {
}
}
pub fn mixed_no_ref(x: MixedEnum) {
match x {
MixedEnum::A { i } | MixedEnum::B(i) => { //~ ERROR unused variable
println!("match");
}
}
}
pub fn mixed_with_ref(x: MixedEnum) {
match x {
MixedEnum::A { ref i } | MixedEnum::B(ref i) => { //~ ERROR unused variable
println!("match");
}
}
}
pub fn main() {
no_ref(MyEnum::A { i: 1, j: 2 });
with_ref(MyEnum::A { i: 1, j: 2 });
inner_no_ref(Some(MyEnum::A { i: 1, j: 2 }));
inner_with_ref(Some(MyEnum::A { i: 1, j: 2 }));
mixed_no_ref(MixedEnum::B(5));
mixed_with_ref(MixedEnum::B(5));
}

32
src/test/ui/lint/issue-67691-unused-field-in-or-pattern.stderr
View file

@ -1,5 +1,5 @@
error: unused variable: `j`
--> $DIR/issue-67691-unused-field-in-or-pattern.rs:15:16
--> $DIR/issue-67691-unused-field-in-or-pattern.rs:20:16
|
LL | A { i, j } | B { i, j } => {
| ^ ^
@ -16,7 +16,7 @@ LL | A { i, j: _ } | B { i, j: _ } => {
| ^^^^ ^^^^
error: unused variable: `j`
--> $DIR/issue-67691-unused-field-in-or-pattern.rs:25:16
--> $DIR/issue-67691-unused-field-in-or-pattern.rs:30:16
|
LL | A { i, ref j } | B { i, ref j } => {
| ^^^^^ ^^^^^
@ -27,7 +27,7 @@ LL | A { i, j: _ } | B { i, j: _ } => {
| ^^^^ ^^^^
error: unused variable: `j`
--> $DIR/issue-67691-unused-field-in-or-pattern.rs:35:21
--> $DIR/issue-67691-unused-field-in-or-pattern.rs:40:21
|
LL | Some(A { i, j } | B { i, j }) => {
| ^ ^
@ -38,7 +38,7 @@ LL | Some(A { i, j: _ } | B { i, j: _ }) => {
| ^^^^ ^^^^
error: unused variable: `j`
--> $DIR/issue-67691-unused-field-in-or-pattern.rs:47:21
--> $DIR/issue-67691-unused-field-in-or-pattern.rs:52:21
|
LL | Some(A { i, ref j } | B { i, ref j }) => {
| ^^^^^ ^^^^^
@ -48,5 +48,27 @@ help: try ignoring the field
LL | Some(A { i, j: _ } | B { i, j: _ }) => {
| ^^^^ ^^^^
error: aborting due to 5 previous errors
error: unused variable: `i`
--> $DIR/issue-67691-unused-field-in-or-pattern.rs:62:24
|
LL | MixedEnum::A { i } | MixedEnum::B(i) => {
| ^ ^
|
help: try ignoring the field
|
LL | MixedEnum::A { i: _ } | MixedEnum::B(_i) => {
| ^^^^ ^^
error: unused variable: `i`
--> $DIR/issue-67691-unused-field-in-or-pattern.rs:70:24
|
LL | MixedEnum::A { ref i } | MixedEnum::B(ref i) => {
| ^^^^^ ^^^^^
|
help: try ignoring the field
|
LL | MixedEnum::A { i: _ } | MixedEnum::B(_i) => {
| ^^^^ ^^
error: aborting due to 6 previous errors

8
src/test/ui/liveness/liveness-dead.stderr
View file

@ -1,8 +1,8 @@
error: value assigned to `x` is never read
--> $DIR/liveness-dead.rs:9:13
--> $DIR/liveness-dead.rs:9:9
|
LL | let mut x: isize = 3;
| ^
| ^^^^^
|
note: the lint level is defined here
--> $DIR/liveness-dead.rs:2:9
@ -20,10 +20,10 @@ LL | x = 4;
= help: maybe it is overwritten before being read?
error: value passed to `x` is never read
--> $DIR/liveness-dead.rs:20:11
--> $DIR/liveness-dead.rs:20:7
|
LL | fn f4(mut x: i32) {
| ^
| ^^^^^
|
= help: maybe it is overwritten before being read?

8
src/test/ui/liveness/liveness-unused.stderr
View file

@ -44,10 +44,10 @@ LL | let x = 3;
| ^ help: if this is intentional, prefix it with an underscore: `_x`
error: variable `x` is assigned to, but never used
--> $DIR/liveness-unused.rs:30:13
--> $DIR/liveness-unused.rs:30:9
|
LL | let mut x = 3;
| ^
| ^^^^^
|
= note: consider using `_x` instead
@ -65,10 +65,10 @@ LL | #![deny(unused_assignments)]
= help: maybe it is overwritten before being read?
error: variable `z` is assigned to, but never used
--> $DIR/liveness-unused.rs:37:13
--> $DIR/liveness-unused.rs:37:9
|
LL | let mut z = 3;
| ^
| ^^^^^
|
= note: consider using `_z` instead