```
[] ~/projects/jruby $ rvm ruby-2.6.5 do ruby -e "str = 'Dz'; Object.const_set(str, 1)"

[] ~/projects/jruby $ jruby -e "str = 'Dz'; Object.const_set(str, 1)"
NameError: wrong constant name Dz
  const_set at org/jruby/RubyModule.java:3758
     <main> at -e:1
```