Rebuild go from source quickly

I would like to rebuild go from source in a directory where it has already been built. I’ve built it more than once from scratch with no problems and found I can use make.bash from src/ but that still takes a minute for the build to complete each time. Is there a way of using the dist tool, if I keep it from being removed, that would let me just run the last step of building from source, given a working go binary already to save some time?