[ruby-core:118864] [Ruby master Bug#20679] Rails CI errors since abc04e898b627ab37fa9dd5e330f239768778d8b

Issue #20679 has been updated by jeremyevans0 (Jeremy Evans).


Thanks for the report.  I will revert and then try to work on a fix.

----------------------------------------
Bug #20679: Rails CI errors since abc04e898b627ab37fa9dd5e330f239768778d8b
https://bugs.ruby-lang.org/issues/20679#change-109438

* Author: yahonda (Yasuo Honda)
* Status: Open
* Assignee: jeremyevans0 (Jeremy Evans)
* ruby -v: ruby 3.4.0dev (2024-08-15T18:33:13Z :detached: 2c6e16eb51) [x86_64-linux]
* Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN
----------------------------------------
Rails CI against Ruby master branch gets failed since abc04e898b627ab37fa9dd5e330f239768778d8b

### Steps to reproduce

```
git clone https://github.com/rails/rails
cd rails/railties
bundle install
bin/test test/application/rendering_test.rb:39
```

### Expected behavior

It should pass as 2c6e16eb51 does.

```
$ ruby -v
ruby 3.4.0dev (2024-08-15T18:33:13Z :detached: 2c6e16eb51) [x86_64-linux]
$ bin/test test/application/rendering_test.rb:39
/home/yahonda/.rbenv/versions/trunk/lib/ruby/gems/3.4.0+0/gems/json-2.7.1/lib/json/common.rb:3: warning: ostruct was loaded from the standard library, but will no longer be part of the default gems starting from Ruby 3.5.0.
You can add ostruct to your Gemfile or gemspec to silence this warning.
/home/yahonda/.rbenv/versions/trunk/lib/ruby/gems/3.4.0+0/gems/json-2.7.1/lib/json/common.rb:3: warning: ostruct was loaded from the standard library, but will no longer be part of the default gems starting from Ruby 3.5.0.
You can add ostruct to your Gemfile or gemspec to silence this warning.
Run options: --seed 50444

# Running:

.

Finished in 1.554218s, 0.6434 runs/s, 1.2868 assertions/s.
1 runs, 2 assertions, 0 failures, 0 errors, 0 skips
$
```

### Actual behavior
It gets `NoMethodError: undefined method '[]' for nil`.

```
$ ruby -v
ruby 3.4.0dev (2024-08-15T20:00:09Z :detached: abc04e898b) [x86_64-linux]
$ bin/test test/application/rendering_test.rb:39
/home/yahonda/.rbenv/versions/trunk/lib/ruby/gems/3.4.0+0/gems/json-2.7.1/lib/json/common.rb:3: warning: ostruct was loaded from the standard library, but will no longer be part of the default gems starting from Ruby 3.5.0.
You can add ostruct to your Gemfile or gemspec to silence this warning.
/home/yahonda/.rbenv/versions/trunk/lib/ruby/gems/3.4.0+0/gems/json-2.7.1/lib/json/common.rb:3: warning: ostruct was loaded from the standard library, but will no longer be part of the default gems starting from Ruby 3.5.0.
You can add ostruct to your Gemfile or gemspec to silence this warning.
Run options: --seed 53551

# Running:

E

Error:
ApplicationTests::RenderingTest#test_Unknown_format_falls_back_to_HTML_template:
NoMethodError: undefined method '[]' for nil
    /home/yahonda/.rbenv/versions/trunk/lib/ruby/gems/3.4.0+0/gems/rack-test-2.1.0/lib/rack/test.rb:275:in 'Rack::Test::Session#parse_uri'
    /home/yahonda/.rbenv/versions/trunk/lib/ruby/gems/3.4.0+0/gems/rack-test-2.1.0/lib/rack/test.rb:161:in 'Rack::Test::Session#custom_request'
    /home/yahonda/.rbenv/versions/trunk/lib/ruby/gems/3.4.0+0/gems/rack-test-2.1.0/lib/rack/test.rb:112:in 'Rack::Test::Session#get'
    /home/yahonda/.rbenv/versions/trunk/lib/ruby/3.4.0+0/forwardable.rb:240:in 'Rack::Test::Methods#get'
    test/application/rendering_test.rb:39:in 'block in <class:RenderingTest>'


bin/test test/application/rendering_test.rb:19



Finished in 1.499265s, 0.6670 runs/s, 0.0000 assertions/s.
1 runs, 0 assertions, 0 failures, 1 errors, 0 skips
$
```



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