Macro error with Crystal version 1.16

[russ]

I created a minimal example to show the error.
https://github.com/russ/shrine-failure-example/tree/master

Seems to be something with the plugin macros?

require "shrine"
require "shrine/plugins/determine_mime_type"

module Uploads
  class Uploader < Shrine
    load_plugin(
      Shrine::Plugins::DetermineMimeType,
      analyzer: Shrine::Plugins::DetermineMimeType::Tools::File
    )

    finalize_plugins!

    def generate_location(_io : IO | UploadedFile, metadata, **options)
      "/tmp/example"
    end
  end
end

file = File.open("shard.yml")
Uploads::Uploader.upload(file, "store")

❯ crystal example.cr 
Showing last frame. Use --error-trace for full trace.

In lib/shrine/src/shrine.cr:141:30

 141 | {% for plugin in @type.constant(:PLUGINS) %}
                              ^-------
Error: `for` expression must be an array, hash, tuple, named tuple or a range literal, not NilLiteral:

nil