New upstream version 1.52.1+dfsg1

[rustc.git] / src / tools / clippy / tests / ui / cast_lossless_integer.fixed

// run-rustfix

#![allow(clippy::no_effect, clippy::unnecessary_operation, dead_code)]
#![warn(clippy::cast_lossless)]

fn main() {
    // Test clippy::cast_lossless with casts to integer types
    i16::from(1i8);
    i32::from(1i8);
    i64::from(1i8);
    i16::from(1u8);
    i32::from(1u8);
    i64::from(1u8);
    u16::from(1u8);
    u32::from(1u8);
    u64::from(1u8);
    i32::from(1i16);
    i64::from(1i16);
    i32::from(1u16);
    i64::from(1u16);
    u32::from(1u16);
    u64::from(1u16);
    i64::from(1i32);
    i64::from(1u32);
    u64::from(1u32);

    // Test with an expression wrapped in parens
    u16::from(1u8 + 1u8);
}

// The lint would suggest using `f64::from(input)` here but the `XX::from` function is not const,
// so we skip the lint if the expression is in a const fn.
// See #3656
const fn abc(input: u16) -> u32 {
    input as u32
}

// Same as the above issue. We can't suggest `::from` in const fns in impls
mod cast_lossless_in_impl {
    struct A;

    impl A {
        pub const fn convert(x: u32) -> u64 {
            x as u64
        }
    }
}