RUBY_ENCODING_SHIFT   36 include/ruby/encoding.h #define ENCODING_SHIFT RUBY_ENCODING_SHIFT
RUBY_ENCODING_SHIFT   41 include/ruby/encoding.h     RBASIC(obj)->flags |= (VALUE)(i) << RUBY_ENCODING_SHIFT;\
RUBY_ENCODING_SHIFT   46 include/ruby/encoding.h     (int)((RBASIC(obj)->flags & RUBY_ENCODING_MASK)>>RUBY_ENCODING_SHIFT)