Mdx.CramSourceCram tests
The type for cram tests.
command_line t is t's command line. It either adds '\' at the end of each line of t's command or do nothing is t uses the heredoc syntax.
of_lines l parses the commands l.
pp is the pretty-printer for cram tests. pad is the size of the optional whitespace left padding (by default it is 0).
pp_vertical_pad is the pretty printer for the initial padding on the top of Cram tests