#![warn(clippy::needless_bool)] #![allow( unused, dead_code, clippy::no_effect, clippy::if_same_then_else, clippy::equatable_if_let, clippy::needless_if, clippy::needless_return, clippy::self_named_constructors )] use std::cell::Cell; macro_rules! bool_comparison_trigger { ($($i:ident: $def:expr, $stb:expr );+ $(;)*) => ( #[derive(Clone)] pub struct Trigger { $($i: (Cell, 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); let a = 0; let b = 1; a != b; a == b; a >= b; a > b; a <= b; a < b; 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); needless_bool_condition(); if a == b { true } else { // Do not lint as this comment might be important false }; } 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() }; } unsafe fn no(v: u8) -> u8 { v } #[allow(clippy::unnecessary_operation)] fn needless_bool_condition() -> bool { (unsafe { no(4) } & 1 != 0); let _brackets_unneeded = unsafe { no(4) } & 1 != 0; fn foo() -> bool { // parentheses are needed here (unsafe { no(4) } & 1 != 0) } foo() }