Function build_fixed_size_array_di_node 

fn build_fixed_size_array_di_node<'ll, 'tcx>(
    cx: &GenericCx<'ll, FullCx<'ll, 'tcx>>,
    unique_type_id: UniqueTypeId<'tcx>,
    array_type: Ty<'tcx>,
    span: Span,
) -> DINodeCreationResult<'ll>

Creates debuginfo for a fixed size array (e.g. [u64; 123]). For slices (that is, “arrays” of unknown size) use build_slice_type_di_node.