Function typetree_from_ty_impl_inner 

fn typetree_from_ty_impl_inner<'tcx>(
    tcx: TyCtxt<'tcx>,
    ty: Ty<'tcx>,
    depth: usize,
    visited: &mut Vec<Ty<'tcx>>,
    is_reference_target: bool,
) -> TypeTree

Internal implementation with context about whether this is for a reference target.