Dear semi-lazyweb,

Given a git diff of a C/Rust codebase, how to best determine which functions/defines have been modified between the two versions? Yes, the diff itself sometimes gives hints as to what has changed, but it's not always correct. Think about when it modifies the start of a function, but the diffstat "name" shows the previous function, a correct marking, but not what is needed.

Is the correct answer really going to be "compile the two versions and compare the AST" or something like that? No "diff library" somewhere that "knows" how to parse C (and Rust) that can do this in a faster way? Surely I'm missing something obvious here...