-- main.mcl --
exec "exec0" {
	cmd => "echo whatever",
	shell => "/bin/bash",
}

file "/tmp/command-output" {
	state => $const.res.file.state.exists,
}

# this is an error because the shell send key doesn't exist in exec
Exec["exec0"].shell -> File["/tmp/command-output"].content
-- OUTPUT --
# err: errUnify: cannot send/recv from exec[exec0].shell to file[/tmp/command-output].content: key not found in send struct