Parameters.jl dynamically created macros confuse Pluto

[klaff]

Given the following example:

### A Pluto.jl notebook ###
# v0.12.18

using Markdown
using InteractiveUtils

# ╔═╡ bae82490-5443-11eb-33db-21137c0c6206
begin
	import Pkg
	Pkg.activate(mktempdir())
	Pkg.add("Parameters"); using Parameters
end

# ╔═╡ fb8743a0-5443-11eb-0606-f36d8925eacc
function f(p)
	@unpack_MyParams p
	a
end

# ╔═╡ daf1bdf0-5443-11eb-108a-3fa87ce15727
@with_kw mutable struct MyParams
	a::Int = 1
end

# ╔═╡ ef3aeb10-5443-11eb-189c-154c0b7693bd
p = MyParams()

# ╔═╡ 17fc92b0-5444-11eb-360e-0b7eaade4abf
f(p)

# ╔═╡ Cell order:
# ╠═fb8743a0-5443-11eb-0606-f36d8925eacc
# ╠═daf1bdf0-5443-11eb-108a-3fa87ce15727
# ╠═ef3aeb10-5443-11eb-189c-154c0b7693bd
# ╠═17fc92b0-5444-11eb-360e-0b7eaade4abf
# ╠═bae82490-5443-11eb-33db-21137c0c6206

When the file is first loaded, the function f(p) cell will fail with LoadError: UndefVarError: @unpack_MyParams not defined because the @unpack_MyParams macro won't be created until the @with_kw macro runs. The workaround is to manually rerun the function f(p) cell.

[EDIT] A better workaround is to add a MyParams line in any cell using @unpack_MyParams which gives Pluto enough info to get the order right.

# ╔═╡ fb8743a0-5443-11eb-0606-f36d8925eacc
function f(p)
	MyParams # makes cell dependency explicit for Pluto
	@unpack_MyParams p
	a
end

[fonsp]

This can only be solved by fully supporting macros. For that, see #196

[klaff]

Yes, I just wanted to get this macro in the list.