# cabal sandbox init
Writing a default package environment file to <ROOT>/sandbox.dist/cabal.sandbox.config
Creating a new sandbox at <ROOT>/sandbox.dist/sandbox
# cabal install
Resolving dependencies...
Configuring Cabal-99998...
Preprocessing library for Cabal-99998..
Building library for Cabal-99998..
Installing library in <PATH>
Installed Cabal-99998
# cabal sandbox add-source
# cabal install
Warning: custom-setup/custom-setup.cabal: This package requires at least Cabal version 99999
Resolving dependencies...
Configuring Cabal-99999...
Preprocessing library for Cabal-99999..
Building library for Cabal-99999..
Installing library in <PATH>
Installed Cabal-99999
Failed to install custom-setup-1.0
cabal: Error: some packages failed to install:
custom-setup-1.0-92JpsxIMpiQHysxYdDtEVq failed during the configure step. The exception was:
  ExitFailure 1
