Function rustc_passes::liveness::visit_fn

fn visit_fn<'tcx>(
    ir: &mut IrMaps<'tcx>, 
    fk: FnKind<'tcx>, 
    decl: &'tcx FnDecl<'tcx>, 
    body_id: BodyId, 
    sp: Span, 
    id: HirId
)