rust/library/core/tests/num/const_from.rs

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#[test]
fn from() {
use core::convert::TryFrom;
use core::num::TryFromIntError;
// From
const FROM: i64 = i64::from(1i32);
assert_eq!(FROM, 1i64);
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// From int to float
const FROM_F64: f64 = f64::from(42u8);
assert_eq!(FROM_F64, 42f64);
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// Upper bounded
const U8_FROM_U16: Result<u8, TryFromIntError> = u8::try_from(1u16);
assert_eq!(U8_FROM_U16, Ok(1u8));
// Both bounded
const I8_FROM_I16: Result<i8, TryFromIntError> = i8::try_from(1i16);
assert_eq!(I8_FROM_I16, Ok(1i8));
// Lower bounded
const I16_FROM_U16: Result<i16, TryFromIntError> = i16::try_from(1u16);
assert_eq!(I16_FROM_U16, Ok(1i16));
}