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Pranit Bauva authored
The new-configure blows away the old `cabal.project.local`, even if you've tweaked it by hand and it has some sort of substantial changes. To prevents accidents like this from happening, we should store the old local file as backup (`cabal.project.local~`) if we overwrite it. Signed-off-by: Pranit Bauva <pranit.bauva@gmail.com>
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