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Document an unwrap

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This commit is contained in:
oli 2020-11-04 13:44:17 +00:00
parent abacaf2aef
commit 2e53625421
1 changed files with 4 additions and 1 deletions
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5
compiler/rustc_middle/src/ty/consts/int.rs
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@ -265,7 +265,10 @@ macro_rules! try_from {
type Error = Size;
#[inline]
fn try_from(int: ScalarInt) -> Result<Self, Size> {
int.to_bits(Size::from_bytes(std::mem::size_of::<$ty>())).map(|u| u.try_into().unwrap())
// The `unwrap` cannot fail because to_bits (if it succeeds)
// is guaranteed to return a value that fits into the size.
int.to_bits(Size::from_bytes(std::mem::size_of::<$ty>()))
.map(|u| u.try_into().unwrap())
}
}
)*