RB_DYNAMIC_SYM_P  375 include/ruby/ruby.h #define RB_SYMBOL_P(x) (RB_STATIC_SYM_P(x)||RB_DYNAMIC_SYM_P(x))
RB_DYNAMIC_SYM_P  379 include/ruby/ruby.h #define DYNAMIC_SYM_P(x) RB_DYNAMIC_SYM_P(x)