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Description
JuliaDiff/ChainRules.jl#223 manually implements a nograd. Once someone has gotten around to sorting JuliaDiff/ChainRulesCore.jl#150 we'll be able to nograd loads of things really easily, at which point it starts to make sense to want to have a simple way to test that things have been successfully nograd-ed and regressions don't happen.
The tests I had to implement in JuliaDiff/ChainRules.jl#223 are quite verbose and boilerplate-y, so it would be good to have a one-liner that covers both frules and rrules.