INT2FIX           231 include/ruby/ruby.h #define INT2FIX(i) (((VALUE)(i))<<1 | RUBY_FIXNUM_FLAG)
INT2FIX           148 iseq.h         CATCH_TYPE_RESCUE = INT2FIX(1),
INT2FIX           149 iseq.h         CATCH_TYPE_ENSURE = INT2FIX(2),
INT2FIX           150 iseq.h         CATCH_TYPE_RETRY  = INT2FIX(3),
INT2FIX           151 iseq.h         CATCH_TYPE_BREAK  = INT2FIX(4),
INT2FIX           152 iseq.h         CATCH_TYPE_REDO   = INT2FIX(5),
INT2FIX           153 iseq.h         CATCH_TYPE_NEXT   = INT2FIX(6)