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Avoid backtraces on expected failures when built with ghc 8; only use backtraces for unexpected errors.

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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.
This commit is contained in:
Joey Hess 2016-11-15 21:29:54 -04:00
parent 69915c6c9b
commit 0a4479b8ec
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116 changed files with 287 additions and 270 deletions
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Command/VFilter.hs
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@ -26,5 +26,5 @@ start params = do
let view' = filterView view $
map parseViewParam $ reverse params
next $ next $ if visibleViewSize view' > visibleViewSize view
then error "That would add an additional level of directory structure to the view, rather than filtering it. If you want to do that, use vadd instead of vfilter."
then giveup "That would add an additional level of directory structure to the view, rather than filtering it. If you want to do that, use vadd instead of vfilter."
else checkoutViewBranch view' narrowView