Anonymous functions don't work in generators

[timholy]

First noticed in #17968 (comment).

julia> d = Dict(:a=>"abc", :b=>"def")
Dict{Symbol,String} with 2 entries:
  :a => "abc"
  :b => "def"

julia> a = ["abc", "def"]
2-element Array{String,1}:
 "abc"
 "def"

julia> second(p) = p.second
second (generic function with 1 method)

julia> collect((second(p) for p in d))
2-element Array{String,1}:
 "abc"
 "def"

julia> collect((p->p.second for p in d))
2-element Array{##2#4,1}:
 #2
 #2

julia> collect((first(x) for x in a))
2-element Array{Char,1}:
 'a'
 'd'

julia> collect((x->x[1] for x in a))
2-element Array{##6#8,1}:
 #6
 #6

If this is the same as #15276, feel free to close.

[JeffBezanson]

The expression evaluates to a function, so you get an array of functions. Looks to me like it is working.

[timholy]

Duh, right. 🐑