@which not found in my module

General Usage
2

If it is from a script you can try loading InteractiveUtils.

Or you can try using the function which results from the macro, for example, these two are equivalent:

julia> @which sum(2)
sum(a; kw...) in Base at reduce.jl:557

julia> InteractiveUtils.which(sum,(Base.typesof)(2))
sum(a; kw...) in Base at reduce.jl:557
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