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$ rm -rf d
$ mkdir -p d/patches
$ cd d
$ echo a > a
$ echo b > b
$ diff -u a b > patches/patch
$ echo patch -p0 > patches/series
$ rm -f b
$ quilt push -q
> Applying patch patches/patch
> Now at patch patches/patch
$ quilt pop -q
> Removing patch patches/patch
> No patches applied
$ patch -s -p0 < patches/patch
$ quilt push -q
> Applying patch patches/patch
> 1 out of 1 hunk FAILED
> Patch patches/patch can be reverse-applied
$ echo patch -p0 -R > patches/series
$ quilt push -q
> Applying patch patches/patch
> Now at patch patches/patch
$ quilt pop -q
> Removing patch patches/patch
> No patches applied
$ patch -s -p0 -R < patches/patch
$ quilt push -q
> Applying patch patches/patch
> 1 out of 1 hunk FAILED
> Patch patches/patch can be reverse-applied
$ cd ..
$ rm -rf d
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