Function find_capture_matching_projections

fn find_capture_matching_projections<'a, 'tcx>(
    upvars: &'a SortedIndexMultiMap<usize, HirId, Capture<'tcx>>,
    var_hir_id: LocalVarId,
    projections: &[PlaceElem<'tcx>],
) -> Option<(usize, &'a Capture<'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.