gistfile1.txt

14:17:33 ~ $ rustc --version
rustc 1.0.0-nightly (44a287e6e 2015-01-08 17:03:40 -0800)
14:17:36 ~ $ cargo --version
cargo 0.0.1-pre-nightly (8c01b6b 2015-01-08 20:52:43 +0000)
14:17:47 ~ $ cd /tmp
14:17:49 /tmp $ cargo new --bin hello-world
14:18:00 /tmp $ cd hello-world/
/tmp/hello-world
14:18:04 /tmp/hello-world [git:master?] $ cargo run
An unknown error occurred

To learn more, run the command again with --verbose.
14:18:09 /tmp/hello-world [git:master?] $ cargo build
An unknown error occurred

To learn more, run the command again with --verbose.
14:18:11 /tmp/hello-world [git:master?] $ cargo test
An unknown error occurred

To learn more, run the command again with --verbose.
14:18:13 /tmp/hello-world [git:master?] $ cargo cult
No such subcommand

	Did you mean `build`?

14:21:58 /tmp/hello-world [git:master?] $ cowsay -f ghostbusters welp
 ______ 
< welp >
 ------ 
          \
           \
            \          __---__
                    _-       /--______
               __--( /     \ )XXXXXXXXXXX\v.
             .-XXX(   O   O  )XXXXXXXXXXXXXXX-
            /XXX(       U     )        XXXXXXX\
          /XXXXX(              )--_  XXXXXXXXXXX\
         /XXXXX/ (      O     )   XXXXXX   \XXXXX\
         XXXXX/   /            XXXXXX   \__ \XXXXX
         XXXXXX__/          XXXXXX         \__---->
 ---___  XXX__/          XXXXXX      \__         /
   \-  --__/   ___/\  XXXXXX            /  ___--/=
    \-\    ___/    XXXXXX              '--- XXXXXX
       \-\/XXX\ XXXXXX                      /XXXXX
         \XXXXXXXXX   \                    /XXXXX/
          \XXXXXX      >                 _/XXXXX/
            \XXXXX--__/              __-- XXXX/
             -XXXXXXXX---------------  XXXXXX-
                \XXXXXXXXXXXXXXXXXXXXXXXXXX/
                  ""VXXXXXXXXXXXXXXXXXXV""

I get that behavior if I unset DYLD_LIBRARY_PATH

$ echo $DYLD_LIBRARY_PATH
/Users/glenn.pratt/opt/rust-dev/lib: