Thank you! Just one minor nit: please rebase this on top of the staging branch instead of master. This will introduce a delay (few days to ~2 weeks, IME) before you'll see 1.2.1 in master, but will save people a lot of grief by avoiding a lot of rebuilds. That's because re2c has some pretty deep transitive dependencies across the source tree, including stdenv.

A good rule of thumb (for me) is that if you're looking at ~1000 rebuilds, you might want to ask someone -- a lot of the decision can depend on the changes in question. But at ~2000 rebuilds or more in total, it should definitely go to staging. Our bot @GrahamcOfBorg will add some tags indicating how many rebuilds it estimates will happen, so you can get an idea of where it should go.

This change otherwise looks just fine -- thanks! (I'm only asking for 'request changes' to ensure someone doesn't accidentally hit the merge button before this is rebased.)