> When I worked daily on the Rust compiler, it was common for me to have at least three copies of the repository on the computer, hacking on one while all the others were building and testing. I would start building workspace 1, switch terminals, remember what's going on over here in workspace 2, hack on that for a while, start building in workspace 2, switch terminals, etc. Little flow, constant context switching.

And you didn't see the problem!?

When Prof. Wirth was making the Oberon compiler he had a heuristic that any language feature which made the compiler slower at compiling itself was reworked or discarded.