1,7: Redef Error: `A` is an imported class. Add the `redef` keyword to refine it.
	class A
	      ^
1,1--3: Error: method or variable `foo` unknown in `Sys`.
	foo
	^
1,20--26: Error: method `to_json` does not exists in `Array[Int]`.
	print([0..10[.to_a.to_json)
	                   ^
-->7
-->-->......0
1
2
3
4
-->-->..................1225
-->-->............-->hello
-->-->...	end
	^: Syntax Error: unexpected keyword 'end'.
-->...-->......-->Bye
-->-->-->......-->I'm sys
-->-->......-->-->5
-->-->-->-->[0,1,2,3,4,5,6,7,8,9]
-->-->	%$^&
	^: Syntax Error: unexpected operator '%'.
-->