My experience of software development is that just having the source is close to worthless unless you also have some way of building and running it. Many old l

My experience of software development is that just having the source is close to worthless unless you also have some way of building and running it. Many old languages could be preserved by implementing AST based interpreters, even non-dynamic languages. Better than having the source and building and running it, is the ability to powerfully debug, monkey patch, and query the runtime.