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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@ -25,7 +25,7 @@ start (name:description) = do
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showStart "describe" name
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u <- Remote.nameToUUID name
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next $ perform u $ unwords description
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start _ = error "Specify a repository and a description."
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start _ = giveup "Specify a repository and a description."
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perform :: UUID -> String -> CommandPerform
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perform u description = do
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