Pass warn in FromNameLoader.

Library/Homebrew/formulary.rb

@@ -779,7 +779,7 @@ module Formulary
 
       name = ref
 
-      loaders = Tap.map { |tap| super("#{tap}/#{name}") }
+      loaders = Tap.map { |tap| super("#{tap}/#{name}", warn: warn) }
                    .compact
                    .select { _1.path.exist? }
 

Library/Homebrew/test/formulary_spec.rb

@@ -550,6 +550,7 @@ RSpec.describe Formulary do
         before do
           old_tap.path.mkpath
           (old_tap.path/"tap_migrations.json").write tap_migrations.to_json
+          FileUtils.touch default_tap.formula_dir/"foo.rb"
         end
 
         it "does not warn when loading the short token" do