sandbox.out

# cabal v1-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 v1-sandbox add-source
# cabal v1-install
Resolving dependencies...
Configuring q-1.0...
Preprocessing library for q-1.0..
Building library for q-1.0..
Installing library in <PATH>
Completed    q-1.0
# cabal v1-run
message
# cabal v1-run
message updated