Macrocall with Expr

New to Julia
1

I’m in Julia v0.7.

using JuMP
m = Model()
@variable(m, x)

#1
@NLconstraint(m, x == 0)

#2
e2 = :(@NLconstraint(m, x == 0))
eval(e2)

#3
e3 = Expr(:macrocall, Symbol("@NLconstraint"), :m, :(x==0))
eval(e3)

#4
sub_e = Expr(:call, :(==), :x, 0)
e4 = Expr(:macrocall, Symbol("@NLconstraint"), :m, sub_e)
eval(e4)

In the above, #1 and #2 produce the same result, but #3 creates an error. As I examined

julia> e2.args
4-element Array{Any,1}:
 Symbol("@NLconstraint")
 :(#= REPL[124]:2 =#)   
 :m                     
 :(x == 0)

I see :(#= REPL[124]:2 =#). What is this? How should I modify #3? Can I make #4 also work?

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