For comparison, Nemo gives an error.

    $ julia
                   _
       _       _ _(_)_     |  A fresh approach to technical computing
      (_)     | (_) (_)    |  Documentation: https://docs.julialang.org
       _ _   _| |_  __ _   |  Type "?help" for help.
      | | | | | | |/ _` |  |
      | | |_| | | | (_| |  |  Version 0.6.2 (2017-12-13 18:08 UTC)
     _/ |\__'_|_|_|\__'_|  |  Official http://julialang.org/ release
    |__/                   |  x86_64-pc-linux-gnu
     
    julia> using Nemo
     
    Welcome to Nemo version 0.7.3
     
    Nemo comes with absolutely no warranty whatsoever
     
     
    julia> R = ResidueRing(ZZ, 6)
    Integers modulo 6
     
    julia> a = R(5)
    5
     
    julia> b = R(4)
    4
     
    julia> c = a * b
    2
     
    julia> c / a
    ERROR: MethodError: no method matching /(::Nemo.nmod, ::Nemo.nmod)
     
    julia> c / b
    ERROR: MethodError: no method matching /(::Nemo.nmod, ::Nemo.nmod)
     
    julia>  

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