rust-clippy/tests/ui/cast.rs

// Copyright 2014-2018 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

#[warn(
    clippy::cast_precision_loss,
    clippy::cast_possible_truncation,
    clippy::cast_sign_loss,
    clippy::cast_possible_wrap,
    clippy::cast_lossless
)]
#[allow(clippy::no_effect, clippy::unnecessary_operation)]
fn main() {
    // Test clippy::cast_precision_loss
    1i32 as f32;
    1i64 as f32;
    1i64 as f64;
    1u32 as f32;
    1u64 as f32;
    1u64 as f64;
    // Test clippy::cast_possible_truncation
    1f32 as i32;
    1f32 as u32;
    1f64 as f32;
    1i32 as i8;
    1i32 as u8;
    1f64 as isize;
    1f64 as usize;
    // Test clippy::cast_possible_wrap
    1u8 as i8;
    1u16 as i16;
    1u32 as i32;
    1u64 as i64;
    1usize as isize;
    // Test clippy::cast_lossless with casts from floating-point types
    1.0f32 as f64;
    // Test clippy::cast_lossless with an expression wrapped in parens
    (1u8 + 1u8) as u16;
    // Test clippy::cast_sign_loss
    1i32 as u32;
    1isize as usize;
    // Extra checks for *size
    // Test cast_unnecessary
    1i32 as i32;
    1f32 as f32;
    false as bool;
    &1i32 as &i32;
    // Should not trigger
    #[rustfmt::skip]
    let v = vec!(1);
    &v as &[i32];
    1.0 as f64;
    1 as u64;
}