Function bounded_scan 

pub fn bounded_scan(
    variant: Variant,
    dims: [usize; 3],
    seed: Seed<'_>,
    direction: Direction,
    negate: bool,
    input: Read<'_>,
    output: &mut Buffer,
) -> Option<Result<(), Error>>

A sum scan of integers or Booleans, or with negate a left scan by - of them, whose caller asks for totals in output’s dtype, i16 or i32, wide enough for every stored item that the scan reads, whatever width the kernel computes at. The caller asks only where its bound on every running total fits that type. Each lane totals in it through SumAs, wrapping. None for any other request.