rust/src/test/mir-opt/const_prop/cast.rs

// EMIT_MIR rustc.main.ConstProp.diff

fn main() {
    let x = 42u8 as u32;

    let y = 42u32 as u8;
}
Enable `--bless`ing of MIR dumps 2020-03-11 11:49:00 +01:00			`// EMIT_MIR rustc.main.ConstProp.diff`

Lint overflowing integer casts in const prop This extends the invalid cases we catch in const prop to include overflowing integer casts using the same machinery as the overflowing binary and unary operation logic. 2019-12-12 22:03:32 -05:00			`fn main() {`
			`let x = 42u8 as u32;`

			`let y = 42u32 as u8;`
			`}`