blocks should be a slice of IBlockData.

the File.Blocks.

the File.ChangeDetail.

the File.Funcs.

first line excluded.

the Func.Changed.

the Func.Code.Comments.

the Func.Code.Excluded.

the Func.CoverageLabels.

the Line.ExecLabels.

the Line.ExecLabels.

the Line.BlockID.

the Line.Changed.

the Line.LineChanges.

the Line.Code.Excluded.

the Line.CoverageLabels.

the Line.Empty.

the Line.ExecLabels.

the Line.BlockID.

the Line.Labels.

the Line.OldLine.

the Line.Remark.

the Line.Uncoverable.

clone impl.

Block can be used as a unique key across one file.

FuncID and BlockID are globally unique within a file and a commit.