cabal
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Contents of haddock-prologue are not output even with -v3
I have no idea what are its contents, and as there is no way to preserve temporary files (see #11234) debugging haddock invocations is unnecessarily more difficult.
Is this still relevant after #11234 was closed?
Yes. I still have no idea what are the contents of the prologue. -v3 ought to print that too if it prints e.g. contents of response files.