RSTRING_LEN        50 ext/json/ext/generator/unicode.h #define RSTRING_LEN(string) RSTRING(string)->len
RSTRING_LEN        55 ext/json/ext/parser/unicode.h #define RSTRING_LEN(string) RSTRING(string)->len
RSTRING_LEN       595 include/ruby/ruby.h #define RSTRING_LEN(str) \