Pass flags to arguments to exec
If you want to have extended and verbose from a command like prove you could pass the verbose -v flag.
$ prove -v
If you however run this command under carton exec
$ carton exec prove -v
You get the version string from carton.
carton v1.0.22
So you have to utilize the -- to terminate command-line argument passing for carton like so:
$ carton exec -- prove -v
And your test output will be as verbose as you are used to.