Cool. My long-term vision for software development would be to make a new programming environment that structures code in ASTs and stores it in a database rather than file based. However, that will have to come later. First this :)
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You should check Unison language. Each Unison definition is identified by a hash of its syntax tree. So if two unrelated functions have identical AST this means they that from language perspective it's the same function.
a friend/old coworker of mine played with that idea in datalog and wrote about it. https://petevilter.me/post/datalog-typechecking/ it had some pretty cool implications.
Sometimes I daydream that we moved beyond text files and had a format with a UUID per line.
Version control could reliably track movement between files, we could identify copy and paste (and prompt when refactoring), and code coverage changes would be accurate.