I dabbled a little bit in #lean and found the "tactic" concept to be a very intuitive interface to types metaprogramming.
I'm currently tinkering with my blog generated by #hakyll and as usual the hardest in programming is not writing the code, but discovering interfaces.
Given how good the typing is in #haskell, I thought... Hang on, I'm writing all these definitions, surely the LSP could be smart enough to just let me discover the relevant functions right? Something like a tactic but for Haskell.
One search after, I'm discovering Wingman [1], a tactic metaprogramming plugin for HLS which used to work back in GHC<9. Apparently the upgrade cost was too high and the plugin got dropped unfortunately...


