If one had a database of code snippets, then, given a specific code snippet it would be possible to find "similar" code in the database: code that had been chan

If one had a database of code snippets, then, given a specific code snippet it would be possible to find "similar" code in the database: code that had been changed or improved from some original version. One could even create an evolutionary tree for each snippet, if one were so inclined. The pertinent algorithms are already in heavy use in bioinformatics.