I see what you mean. As the sibling noted, I think you're using "sharp edges" in an unconventional way, but Rust definitely has a sort of unpredictable developer experience. Some things go really fast and the programmer finds themselves thinking, "wow! this is as easy as Python/Go/whatever!" and other times something that seems to be easy fails to compile and you get a compiler error that says you need to fix one seemingly small thing, so you try and fix that small thing and you get another seemingly-easy-to-fix compiler error and you just keep pulling on that thread until you've forgotten the problem you were originally setting out to solve. (:

I don't think this is a "sharp edge" (maybe "indeterminately long threads to pull") but it definitely is an unpleasant experience. If anyone knows of any good names for this category of frustration, I'd be happy to hear them!