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Duncan Coutts authored
Fixes issue #3495 This also adds a stub where we can add more detailed failure reporting, but this starts with nothing more than the exit code. Unlike the existing "cabal install" failure reporting, we don't need or want "build" failure reporting to be quite so noisy in common cases like the one local package failing to build, since ghc reports its own errors and there's enough context to see what's going on.
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