Function rustc_mir_build::build::expr::as_place::find_capture_matching_projections

fn find_capture_matching_projections<'a, 'tcx>(
    typeck_results: &'a TypeckResults<'tcx>, 
    var_hir_id: HirId, 
    closure_def_id: DefId, 
    projections: &[PlaceElem<'tcx>]
) -> Option<(usize, &'a CapturedPlace<'tcx>)>

Given a closure, returns the index of a capture within the desugared closure struct and the ty::CapturedPlace which is the ancestor of the Place represented using the var_hir_id and projection.

Note there will be at most one ancestor for any given Place.

Returns None, when the ancestor is not found.