function say_hello()
    println("Hello")
end
A = [1, 2, 3]
B = 2 .+ A
Idx = 1
C = A[Idx]

names(Main) 
# 10-element Vector{Symbol}:
#  :A
#  :B
#  :Base
#  :C
#  :Core
#  :Idx
#  :InteractiveUtils
#  :Main
#  :ans
#  :say_hello