pub static mut rb_cThread: VALUE;

pub static mut rb_cTrueClass: VALUE;

pub fn ruby_init();

pub fn ruby_init_stack(addr: *mut ::std::os::raw::c_void);

pub fn rb_define_class(name: *const ::std::os::raw::c_char, super_: VALUE) -> VALUE;

pub fn rb_obj_class(obj: VALUE) -> VALUE;