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Add run-rustfix for needless_bool lint #4339

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merged 1 commit into from Aug 7, 2019
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Just for now

@@ -0,0 +1,98 @@
// run-rustfix

#![warn(clippy::needless_bool)]
#![allow(
unused,
dead_code,
clippy::no_effect,
clippy::if_same_then_else,
clippy::needless_return
)]

use std::cell::Cell;

macro_rules! bool_comparison_trigger {
($($i:ident: $def:expr, $stb:expr );+ $(;)*) => (

#[derive(Clone)]
pub struct Trigger {
$($i: (Cell<bool>, bool, bool)),+
}

#[allow(dead_code)]
impl Trigger {
pub fn trigger(&self, key: &str) -> bool {
$(
if let stringify!($i) = key {
return self.$i.1 && self.$i.2 == $def;
}
)+
false
}
}
)
}

fn main() {
let x = true;
let y = false;
x;
!x;
!(x && y);
if x {
x
} else {
false
}; // would also be questionable, but we don't catch this yet
bool_ret3(x);
bool_ret4(x);
bool_ret5(x, x);
bool_ret6(x, x);
needless_bool(x);
needless_bool2(x);
needless_bool3(x);
}

fn bool_ret3(x: bool) -> bool {
return x;
}

fn bool_ret4(x: bool) -> bool {
return !x;
}

fn bool_ret5(x: bool, y: bool) -> bool {
return x && y;
}

fn bool_ret6(x: bool, y: bool) -> bool {
return !(x && y);
}

fn needless_bool(x: bool) {
if x {};
}

fn needless_bool2(x: bool) {
if !x {};
}

fn needless_bool3(x: bool) {
bool_comparison_trigger! {
test_one: false, false;
test_three: false, false;
test_two: true, true;
}

if x {};
if !x {};
}

fn needless_bool_in_the_suggestion_wraps_the_predicate_of_if_else_statement_in_brackets() {
let b = false;
let returns_bool = || false;

let x = if b {
true
} else { !returns_bool() };
}
@@ -1,5 +1,13 @@
// run-rustfix

#![warn(clippy::needless_bool)]
#![allow(unused, dead_code, clippy::no_effect)]
#![allow(
unused,
dead_code,
clippy::no_effect,
clippy::if_same_then_else,
clippy::needless_return
)]

use std::cell::Cell;

@@ -25,20 +33,9 @@ macro_rules! bool_comparison_trigger {
)
}

#[allow(clippy::if_same_then_else)]
fn main() {
let x = true;
let y = false;
if x {
true
} else {
true
};
if x {
false
} else {
false
};
if x {
true
} else {
@@ -59,45 +56,31 @@ fn main() {
} else {
false
}; // would also be questionable, but we don't catch this yet
bool_ret(x);
bool_ret2(x);
bool_ret3(x);
bool_ret5(x, x);
bool_ret4(x);
bool_ret5(x, x);
bool_ret6(x, x);
needless_bool(x);
needless_bool2(x);
needless_bool3(x);
}

#[allow(clippy::if_same_then_else, clippy::needless_return)]
fn bool_ret(x: bool) -> bool {
fn bool_ret3(x: bool) -> bool {
if x {
return true;
} else {
return true;
return false;
};
}

#[allow(clippy::if_same_then_else, clippy::needless_return)]
fn bool_ret2(x: bool) -> bool {
fn bool_ret4(x: bool) -> bool {
if x {
return false;
} else {
return false;
};
}

#[allow(clippy::needless_return)]
fn bool_ret3(x: bool) -> bool {
if x {
return true;
} else {
return false;
};
}

#[allow(clippy::needless_return)]
fn bool_ret5(x: bool, y: bool) -> bool {
if x && y {
return true;
@@ -106,16 +89,6 @@ fn bool_ret5(x: bool, y: bool) -> bool {
};
}

#[allow(clippy::needless_return)]
fn bool_ret4(x: bool) -> bool {
if x {
return false;
} else {
return true;
};
}

#[allow(clippy::needless_return)]
fn bool_ret6(x: bool, y: bool) -> bool {
if x && y {
return false;
@@ -1,37 +1,17 @@
error: this if-then-else expression will always return true
--> $DIR/needless_bool.rs:32:5
|
LL | / if x {
LL | | true
LL | | } else {
LL | | true
LL | | };
| |_____^
|
= note: `-D clippy::needless-bool` implied by `-D warnings`

error: this if-then-else expression will always return false
--> $DIR/needless_bool.rs:37:5
|
LL | / if x {
LL | | false
LL | | } else {
LL | | false
LL | | };
| |_____^

error: this if-then-else expression returns a bool literal
--> $DIR/needless_bool.rs:42:5
--> $DIR/fixable.rs:39:5
|
LL | / if x {
LL | | true
LL | | } else {
LL | | false
LL | | };
| |_____^ help: you can reduce it to: `x`
|
= note: `-D clippy::needless-bool` implied by `-D warnings`

error: this if-then-else expression returns a bool literal
--> $DIR/needless_bool.rs:47:5
--> $DIR/fixable.rs:44:5
|
LL | / if x {
LL | | false
@@ -41,7 +21,7 @@ LL | | };
| |_____^ help: you can reduce it to: `!x`

error: this if-then-else expression returns a bool literal
--> $DIR/needless_bool.rs:52:5
--> $DIR/fixable.rs:49:5
|
LL | / if x && y {
LL | | false
@@ -50,38 +30,28 @@ LL | | true
LL | | };
| |_____^ help: you can reduce it to: `!(x && y)`

error: this if-then-else expression will always return true
--> $DIR/needless_bool.rs:75:5
error: this if-then-else expression returns a bool literal
--> $DIR/fixable.rs:69:5
|
LL | / if x {
LL | | return true;
LL | | } else {
LL | | return true;
LL | | };
| |_____^

error: this if-then-else expression will always return false
--> $DIR/needless_bool.rs:84:5
|
LL | / if x {
LL | | return false;
LL | | } else {
LL | | return false;
LL | | };
| |_____^
| |_____^ help: you can reduce it to: `return x`

error: this if-then-else expression returns a bool literal
--> $DIR/needless_bool.rs:93:5
--> $DIR/fixable.rs:77:5
|
LL | / if x {
LL | | return true;
LL | | } else {
LL | | return false;
LL | | } else {
LL | | return true;
LL | | };
| |_____^ help: you can reduce it to: `return x`
| |_____^ help: you can reduce it to: `return !x`

error: this if-then-else expression returns a bool literal
--> $DIR/needless_bool.rs:102:5
--> $DIR/fixable.rs:85:5
|
LL | / if x && y {
LL | | return true;
@@ -91,17 +61,7 @@ LL | | };
| |_____^ help: you can reduce it to: `return x && y`

error: this if-then-else expression returns a bool literal
--> $DIR/needless_bool.rs:111:5
|
LL | / if x {
LL | | return false;
LL | | } else {
LL | | return true;
LL | | };
| |_____^ help: you can reduce it to: `return !x`

error: this if-then-else expression returns a bool literal
--> $DIR/needless_bool.rs:120:5
--> $DIR/fixable.rs:93:5
|
LL | / if x && y {
LL | | return false;
@@ -111,33 +71,33 @@ LL | | };
| |_____^ help: you can reduce it to: `return !(x && y)`

error: equality checks against true are unnecessary
--> $DIR/needless_bool.rs:128:8
--> $DIR/fixable.rs:101:8
|
LL | if x == true {};
| ^^^^^^^^^ help: try simplifying it as shown: `x`
|
= note: `-D clippy::bool-comparison` implied by `-D warnings`

error: equality checks against false can be replaced by a negation
--> $DIR/needless_bool.rs:132:8
--> $DIR/fixable.rs:105:8
|
LL | if x == false {};
| ^^^^^^^^^^ help: try simplifying it as shown: `!x`

error: equality checks against true are unnecessary
--> $DIR/needless_bool.rs:142:8
--> $DIR/fixable.rs:115:8
|
LL | if x == true {};
| ^^^^^^^^^ help: try simplifying it as shown: `x`

error: equality checks against false can be replaced by a negation
--> $DIR/needless_bool.rs:143:8
--> $DIR/fixable.rs:116:8
|
LL | if x == false {};
| ^^^^^^^^^^ help: try simplifying it as shown: `!x`

error: this if-then-else expression returns a bool literal
--> $DIR/needless_bool.rs:152:12
--> $DIR/fixable.rs:125:12
|
LL | } else if returns_bool() {
| ____________^
@@ -147,5 +107,5 @@ LL | | true
LL | | };
| |_____^ help: you can reduce it to: `{ !returns_bool() }`

error: aborting due to 16 previous errors
error: aborting due to 12 previous errors

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