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# core::integer::i64_diff

If `lhs` >= `rhs` returns `Ok(lhs - rhs)` else returns `Err(2**64 + lhs - rhs)`.

## Signature

```rust theme={null}
pub extern fn i64_diff(lhs: i64, rhs: i64) -> Result implicits(RangeCheck) nopanic;
```