$ ruby
/usr/local/lib/ruby/2.6.0/x86_64-linux/enc/encdb.so: warning: rb_define_const: invalid name `�k' for constant
/usr/local/lib/ruby/2.6.0/x86_64-linux/enc/encdb.so: warning: rb_define_const: invalid name `�k' for constant
/usr/local/lib/ruby/2.6.0/x86_64-linux/enc/encdb.so: warning: rb_define_const: invalid name `l' for constant
/usr/local/lib/ruby/2.6.0/x86_64-linux/enc/encdb.so: warning: rb_define_const: invalid name `�m' for constant
/usr/local/lib/ruby/2.6.0/x86_64-linux/enc/encdb.so: warning: rb_define_const: invalid name `�m' for constant
/usr/local/lib/ruby/2.6.0/x86_64-linux/enc/encdb.so: warning: rb_define_const: invalid name `n' for constant
/usr/local/lib/ruby/2.6.0/x86_64-linux/enc/encdb.so: warning: rb_define_const: invalid name `?n' for constant
/usr/local/lib/ruby/2.6.0/x86_64-linux/enc/encdb.so: warning: rb_define_const: invalid name `_n' for constant
/usr/local/lib/ruby/2.6.0/x86_64-linux/enc/encdb.so: warning: rb_define_const: invalid name `n' for constant
/usr/local/lib/ruby/2.6.0/x86_64-linux/enc/encdb.so: warning: rb_define_const: invalid name `�n' for constant
/usr/local/lib/ruby/2.6.0/x86_64-linux/enc/encdb.so: warning: rb_define_const: invalid name `�n' for constant
/usr/local/lib/ruby/2.6.0/x86_64-linux/enc/encdb.so: warning: rb_define_const: invalid name `�p' for constant