rect.jl fails on Julia
```jl
ERROR: LoadError: type Rectangle has no field is_square
Stacktrace:
 [1] getproperty(x::Rectangle, f::Symbol)
   @ Base ./Base.jl:33
 [2] show()
   @ Main ~/python/py2many/tests/cases/rect.jl:13
 [3] main()
   @ Main ~/python/py2many/tests/cases/rect.jl:23
 [4] top-level scope
   @ ~/python/py2many/tests/cases/rect.jl:26
```