25 Aug
2011
25 Aug
'11
6:25 p.m.
On 11-08-25 10:42 AM, Bertram Felgenhauer wrote:
(or rebuild Cabal / cabal-install starting with 'cabal unpack Cabal; cabal unpack cabal-install')
Replacing Cabal will break bin-package-db. Breaking bin-package-db will break ghc (the GHC API). "Break" means you likely don't run into problems right now, but several weeks later, you try to "cabal install" a package that depends on some of the above, and you get a nonsensical error message, and you don't even suspect it all started with replacing a package several weeks ago (you likely even forget that you did it). See my http://www.vex.net/~trebla/haskell/sicp.xhtml , in particular the "pigeon drop con" scenerio.