How about we don't use actively terrible julia code as a common demo?

[oxinabox]

I fixed it from being the worst by putting it in a function.
Though I wonder if better would have been to fix it with const + making loss(m) = (x,y)->... etc.

[tk3369]

I think it's best to promote good practice. I imagine that people would take a template from model zoo and start manipulating it into their own use cases.

[oxinabox]

People do.
E.g, i see very similar code is now in:
JuliaLogging/TensorBoardLogger.jl#60

[jamblejoe]

This was suggested for the examples in Flux.jl as well, see FluxML/Flux.jl#1085.
I find it easiest to suround critical parts in let ... end blocks.