Here is a list of all documented variables with links to the struct/union documentation for each field:

A

B

C

D

E

F

G

H

I

K

L

M

N

O

P

Q

R

S

T

U

V

W

_

- m -

• magic_comment_list : pm_parser
• main_script : pm_options
• mark : rb_ractor_local_storage_type
• match : parse_regular_expression_named_capture_data_t
• maxfd : rb_fdset_t
• maximum : pm_numbered_parameters_node
• message : pm_diagnostic_data_t, pm_diagnostic_t
• message_loc : pm_call_and_write_node, pm_call_node, pm_call_operator_write_node, pm_call_or_write_node, pm_call_target_node
• mode : pm_lex_mode, rb_io
• module_keyword_loc : pm_module_node
• module_subclass_entry : rb_classext_struct
• multibyte : pm_encoding_t