How to exploit ./hadrian/ghci to find errors quickly?

Norman Ramsey nr at
Tue Feb 1 19:46:48 UTC 2022

 > The Binary runGet issue usually means that your build tree is out of date.
 > It's probably worth deleting and building from scratch again.

For those who may come after me: if ./hadrian/ghci barfs with a Binary
runGet issue, the build tree that needs to be deleted is
`.hadrian_ghci`, not `_build`.


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