Очевидно човек може да прави така:
> ruby --dump insns -e '$10'
== disasm: <RubyVM::InstructionSequence:<main>@-e>======================
0000 trace 1 ( 1)
0002 getspecial 1, 20
0005 leave
> ruby --dump parsetree_with_comment -e '$10'
###########################################################
## Do NOT use this node dump for any purpose other than ##
## debug and research. Compatibility is not guaranteed. ##
###########################################################
# @ NODE_SCOPE (line: 1)
# | # new scope
# | # format: [nd_tbl]: local table, [nd_args]: arguments, [nd_body]: body
# +- nd_tbl (local table): (empty)
# +- nd_args (arguments):
# | (null node)
# +- nd_body (body):
# @ NODE_NTH_REF (line: 1)
# | # nth special variable reference
# | # format: $[nd_nth]
# | # example: $1, $2, ..
# +- nd_nth (variable): $10