Function compute_regions 

pub(crate) fn compute_regions<'tcx>(
    root_cx: &mut BorrowCheckRootCtxt<'tcx>,
    infcx: &BorrowckInferCtxt<'tcx>,
    body: &Body<'tcx>,
    location_table: &PoloniusLocationTable,
    move_data: &MoveData<'tcx>,
    borrow_set: &BorrowSet<'tcx>,
    location_map: Rc<DenseLocationMap>,
    universal_region_relations: Frozen<UniversalRegionRelations<'tcx>>,
    constraints: MirTypeckRegionConstraints<'tcx>,
    polonius_facts: Option<AllFacts<RustcFacts>>,
    polonius_context: Option<PoloniusContext>,
) -> NllOutput<'tcx>

Computes the (non-lexical) regions from the input MIR.

This may result in errors being reported.