pub trait CheckedAdd: Add<Self, Self> { fn checked_add(&self, v: &Self) -> Option<Self>; }
fn checked_add(&self, v: &Self) -> Option<Self>
impl CheckedAdd for int
impl CheckedAdd for i8
impl CheckedAdd for i16
impl CheckedAdd for i32
impl CheckedAdd for i64
impl CheckedAdd for uint
impl CheckedAdd for u8
impl CheckedAdd for u16
impl CheckedAdd for u32
impl CheckedAdd for u64
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