Julia metaprogramming: "ERROR: unsupported or misplaced expression $"

Question

Why am I getting the error message below? (I'm fairly new to metaprogramming in Julia.) Thanks.

julia> d = :e
:e

julia> macroexpand(:(b.$d))
:(b.e)

julia> macroexpand(:($d.c))
:(e.c)

julia> macroexpand(:(b.$d.c))
ERROR: unsupported or misplaced expression $

julia> macroexpand(:(b.$(d).c))
ERROR: unsupported or misplaced expression $

Answer 1

This was a bug, issue filed here:

https://github.com/JuliaLang/julia/issues/10997

It has been fixed since. As indicated in the comments on the question, there are some hacky workarounds if you're stuck on an unfixed Julia version, but hopefully you can upgrade.