Manipulating expressions with macros

General Usage
2

I did it! The macro I sought was:

macro newrule(expr)
	quote $(Expr(:quote, expr)) end
end

Now we have, as desired:

julia> [@newrule $op(a, 0) => a for op ∈ (+, -)]
2-element Array{Expr,1}:
 :((+)(a, 0) => a)
 :((-)(a, 0) => a)

QuoteNode(expr) was a red herring. I thought this played the role of Expr(:quote, expr), but it does not, and I wasn’t exactly sure what QuoteNode was meant for until I read this issue.

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