Incorrect module name in .bkp instantiation causes a "Failed to load interface" error
When attempting to compile the following .bkp file:
unit basic where signature Basic where unit mod where module Mod where unit main where dependency basic [ Basic = mod:Nonsense ]
GHC produces the error:
ghc --backpack Error2.bkp [1 of 3] Processing basic [2 of 3] Processing mod Instantiating mod [1 of 1] Compiling Mod ( mod\Mod.hs, mod\Mod.o ) [3 of 3] Processing main Instantiating main [1 of 1] Including basic[Basic=mod:Nonsense] Instantiating basic[Basic=mod:Nonsense] [1 of 1] Compiling Basic[sig] ( basic\Basic.hsig, basic\basic-ER8okxhuIcsFJ32OYv1Qcp\Basic.o ) <no location info>: error: Failed to load interface for `Nonsense' There are files missing in the `mod' package, try running 'ghc-pkg check'. Use -v (or `:set -v` in ghci) to see a list of the files searched for.
It would be better to catch this problem earlier on, and report a proper error message.
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