Function visit_local_usage 

pub fn visit_local_usage<const N: usize>(
    locals: [Local; N],
    mir: &Body<'_>,
    location: Location,
) -> Option<[LocalUsage; N]>

Collects usage locations (reads, consumes or mutations) for the set of the locals across blocks where their storage remains live relative to the location specified.

Returns:

• Some([LocalUsage; N]) containing usage metadata for each local in locals.
• None if the analysis fails or location is unreachable.