LLDB : how to print string, and pretty print instances

Hi all ! First time using lldb with Crystal, I can set a breakpoint and examine some variables

But I don’t understand how I can print the content of a String
When I use
p *self.scope.name
I get only (String) (bytesize = 17, length = 0, c = 'a')

And is there a way to pretty print a class instance ?
I tried po *self.scope which displays nothing

My program is well built with the --debug flag