When running "darcs add" on a path that doesn't (currently) exist:

# darcs add apt/apt.conf.d/10apt-listbugs.distrib
darcs: apt/apt.conf.d/10apt-listbugs.distrib: getSymbolicLinkStatus: does not exist (No such file or directory)

# darcs --version
2.4 (+ 142 patches)
# darcs --exact-version | sed -n /Compiled.with/,\$p | fmt
Compiled with:

HTTP-4000.0.6 array-0.3.0.0 base-4.2.0.0 bytestring-0.9.1.5
containers-0.3.0.0 directory-1.0.1.0 extensible-exceptions-0.1.1.1
filepath-1.1.0.3 hashed-storage-0.4.10 haskeline-0.6.2.2 html-1.0.1.2
mmap-0.4.1 mtl-1.1.0.2 network-2.2.1.7 old-time-1.0.0.3 parsec-2.1.0.1
process-1.0.1.2 random-1.0.0.2 regex-compat-0.92 tar-0.3.1.0
terminfo-0.3.0.2 text-0.7.1.0 unix-2.4.0.0 zlib-0.5.2.0

I could have sworn this was already in the bug tracker, but we have a
general problem with this unfriendly error message (I guess the problem
is that getSymbolicLinkStatus looks like gobbledygook or exposes too
much implementation detail).

We it should just something simpler like darcs:
apt/apt.conf.d/10apt-listbugs.distrib: No such file or directory

or better!

The following patch sent by Eric Kow <kowey@darcs.net> updated issue issue1804 with
status=resolved;resolvedin=2.8.0 HEAD

* Resolve issue1804: friendlier message when adding missing files. 
Ignore-this: b221e137f9e958d62b4c57738af7828e

Instead of
  darcs: foo: getSymbolicLinkStatus: does not exist (No such file or directory)
We now have
  File foo does not exist!