Function infer_placeholder_type 

fn infer_placeholder_type<'tcx>(
    cx: &dyn HirTyLowerer<'tcx>,
    def_id: LocalDefId,
    hir_id: HirId,
    ty_span: Span,
    body_span: Span,
    item_ident: Ident,
    kind: &'static str,
) -> Ty<'tcx>