RGENGC_WB_PROTECTED_STRING  767 include/ruby/ruby.h #ifndef RGENGC_WB_PROTECTED_STRING
RGENGC_WB_PROTECTED_STRING  674 string.c           NEWOBJ_OF(str, struct RString, klass, T_STRING | (RGENGC_WB_PROTECTED_STRING ? FL_WB_PROTECTED : 0));