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You can use the following patch:

$ cat Patch01-temprorary_spec.rb.patch 
--- src/ruby-stud-0.0.23/spec/stud/temporary_spec.rb    2017-07-21 20:26:17.000000000 +0200
+++ src/ruby-stud-0.0.23/spec/stud/temporary_spec.rb.new        2024-10-20 16:19:52.481376624 +0200
@@ -41,7 +41,7 @@
       it "should clean up after the block closes" do
         path = ""
         file { |fd| path = fd.path }
-        reject { File }.exists?(path)
+        reject { File }.exist?(path)
       end
     end # with a block
   end # #file

Use it by adding the following to the PKGBUILD prepare section:

  cd "$srcdir"
  patch -p1 -i Patch01-temprorary_spec.rb.patch

made a temporary fork https://github.com/pato-pan/ruby-stud

It's not a replacement since I don't know anything about Ruby and the creator is still online.

"Class does not respond to the 'exists?' method" is the reason for this error, and I found this that suggests an update to ruby 3.2 broke the package https://github.com/oneclick/rubyinstaller2/issues/331 it uses something that was removed because it was deprecated.

This is probably an issue with the original package rather than the packagebuild. You can easily fix this by editing ./paru/clone/ruby-stud/src/ruby-stud-0.0.23/spec/stud/temporary_spec.rb just so in line 44 it says exist instead.

It's as simple as replacing exists with exist.

using Ruby 3.1 should also fix the issue

Check fails

==> Starting check()...
.................Failed (Expected ["item!"], but got nil). Sleeping for 0.02
Failed (Expected ["item!"], but got nil). Sleeping for 0.04
Failed (Expected ["item!"], but got nil). Sleeping for 0.08
Failed (Expected ["item!"], but got nil). Sleeping for 0.16
Failed (Expected ["item!"], but got nil). Sleeping for 0.32
Failed (Expected ["item!"], but got nil). Sleeping for 0.64
............................F............

Failures:

  1) Stud::Temporary#file with a block should clean up after the block closes
     Failure/Error: reject { File }.exists?(path)

     Insist::Failure:
       Class does not respond to the 'exists?' method
     # ./spec/stud/temporary_spec.rb:44:in `block (4 levels) in <top (required)>'

Finished in 30.05 seconds (files took 0.07119 seconds to load)
58 examples, 1 failure

Failed examples:

rspec ./spec/stud/temporary_spec.rb:41 # Stud::Temporary#file with a block should clean up after the block closes

==> ERROR: A failure occurred in check().
    Aborting...