fn assemble_candidates_from_impls<'cx, 'tcx>(
selcx: &mut SelectionContext<'cx, 'tcx>,
obligation: &Obligation<'tcx, ProjectionTy<'tcx>>,
candidate_set: &mut ProjectionCandidateSet<'tcx>
)
fn assemble_candidates_from_impls<'cx, 'tcx>(
selcx: &mut SelectionContext<'cx, 'tcx>,
obligation: &Obligation<'tcx, ProjectionTy<'tcx>>,
candidate_set: &mut ProjectionCandidateSet<'tcx>
)