Avoid backtraces on expected failures when built with ghc 8; only use backtraces for unexpected errors.
ghc 8 added backtraces on uncaught errors. This is great, but git-annex was using error in many places for a error message targeted at the user, in some known problem case. A backtrace only confuses such a message, so omit it. Notably, commands like git annex drop that failed due to eg, numcopies, used to use error, so had a backtrace. This commit was sponsored by Ethan Aubin.
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@ -27,5 +27,5 @@ start (ks:us:[]) = do
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then liftIO exitSuccess
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else liftIO exitFailure
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where
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k = fromMaybe (error "bad key") (file2key ks)
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start _ = error "Wrong number of parameters"
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k = fromMaybe (giveup "bad key") (file2key ks)
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start _ = giveup "Wrong number of parameters"
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