fn parentOutput(parent_block: []const u8, key: [8]u32, flags: Flags) Output
fn parentOutput(parent_block: []const u8, key: [8]u32, flags: Flags) Output { var block: [Blake3.block_length]u8 = undefined; @memcpy(&block, parent_block[0..Blake3.block_length]); return Output{ .input_cv = key, .block = block, .block_len = Blake3.block_length, .counter = 0, .flags = flags.with(.{ .parent = true }), }; }