Is there a way I can get Hadrian to build the documentation for just that module?

Here's more detail about what I'm facing. I'm trying to fine-tune the Haddock documentation of a module that I intend to put into an MR for GHC Central. This means I need to be able to re-run Haddock so I can look at the output, with a sensible turnaround time. I've tried ``` ./hadrian/build _build/docs/html/libraries/ghc/GHC-Driver-Backend.html ``` But this attempt results in no action, even when the source code has changed. I've also tried ``` haddock -o /tmp/zzz -h compiler/GHC/Driver/Backend.hs ``` But this attempt results in a slew of error messages, all similar, of which a representative sample looks like this: ``` compiler/GHC/Driver/Backend.hs:104:1: error: Could not load module ‘GHC.Prelude’ It is a member of the hidden package ‘ghc-9.2.2’. You can run ‘:set -package ghc’ to expose it. (Note: this unloads all the modules in the current scope.) Use -v (or `:set -v` in ghci) to see a list of the files searched for. | 104 | import GHC.Prelude | ^^^^^^^^^^^^^^^^^^ ``` Finally, I have had some success with ``` ./hadrian/build -j _build/docs/html/index.html ``` This attempt does rebuild the documentation, but I am sorry to say that the first run took 19 minutes, and subsequent runs take about 3 minutes. On a nice, beefy machine with 8 cores. If it takes 3 minutes to visualize every change in the documentation, I think I will not have the patience to make any more changes. Help? Norman