[ruby-core:118401] [Ruby master Bug#20599] TypeError: #<BaseMailer:0x00000000008070> is not a symbol nor a string since 4cbc41d5e5cb6793174d5964975fdb4470323ca1 with YJIT enabled

Issue #20599 has been reported by yahonda (Yasuo Honda).

----------------------------------------
Bug #20599: TypeError: #<BaseMailer:0x00000000008070> is not a symbol nor a string since 4cbc41d5e5cb6793174d5964975fdb4470323ca1 with YJIT enabled
https://bugs.ruby-lang.org/issues/20599

* Author: yahonda (Yasuo Honda)
* Status: Open
* ruby -v: ruby 3.4.0dev (2024-06-26T20:01:26Z :detached: 4cbc41d5e5) [x86_64-linux]
* Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN
----------------------------------------

https://buildkite.com/rails/rails-nightly/builds/711#01905b80-6b82-460c-908d-c8bc7e69293a/1213-1221

### Steps to reproduce
```
git clone https://github.com/rails/rails
cd rails/actionmailer
bundle install
RUBY_YJIT_ENABLE=1 bin/test test/base_test.rb --seed 51482
```

### Expected behavior 
It should pass.

### Actual behavior
It raises `TypeError: #<BaseMailer:0x00000000006cc0> is not a symbol nor a string` as follows.

```ruby
```
$ RUBY_YJIT_ENABLE=1 bin/test test/base_test.rb --seed 51482
Run options: --seed 51482

# Running:

.............................E

Error:
BaseTest#test_explicit_multipart_with_one_template_has_the_expected_format:
TypeError: #<BaseMailer:0x00000000006cc0> is not a symbol nor a string
    /home/yahonda/src/github.com/rails/rails/actionpack/lib/abstract_controller/base.rb:226:in 'AbstractController::Base#process_action'
    /home/yahonda/src/github.com/rails/rails/actionpack/lib/abstract_controller/callbacks.rb:261:in 'block in AbstractController::Callbacks#process_action'
    /home/yahonda/src/github.com/rails/rails/activesupport/lib/active_support/callbacks.rb:101:in 'ActiveSupport::Callbacks#run_callbacks'
    /home/yahonda/src/github.com/rails/rails/actionpack/lib/abstract_controller/callbacks.rb:260:in 'AbstractController::Callbacks#process_action'
    /home/yahonda/src/github.com/rails/rails/actionpack/lib/abstract_controller/base.rb:163:in 'AbstractController::Base#process'
    lib/action_mailer/rescuable.rb:29:in 'block in ActionMailer::Rescuable#process'
    lib/action_mailer/rescuable.rb:21:in 'ActionMailer::Rescuable#handle_exceptions'
    lib/action_mailer/rescuable.rb:28:in 'ActionMailer::Rescuable#process'
    /home/yahonda/src/github.com/rails/rails/actionview/lib/action_view/rendering.rb:40:in 'ActionView::Rendering#process'
    lib/action_mailer/base.rb:657:in 'block in ActionMailer::Base#process'
    /home/yahonda/src/github.com/rails/rails/activesupport/lib/active_support/notifications.rb:212:in 'ActiveSupport::Notifications.instrument'
    lib/action_mailer/base.rb:656:in 'ActionMailer::Base#process'
    lib/action_mailer/message_delivery.rb:136:in 'block in ActionMailer::MessageDelivery#processed_mailer'
    <internal:kernel>:91:in 'Kernel#tap'
    lib/action_mailer/message_delivery.rb:135:in 'ActionMailer::MessageDelivery#processed_mailer'
    lib/action_mailer/message_delivery.rb:32:in 'ActionMailer::MessageDelivery#__getobj__'
    /home/yahonda/.rbenv/versions/trunk/lib/ruby/3.4.0+0/delegate.rb:84:in 'Delegator#method_missing'
    test/base_test.rb:538:in 'block in <class:BaseTest>'


bin/test test/base_test.rb:536

E

Error:
BaseTest#test_explicit_multipart:
TypeError: #<BaseMailer:0x00000000006d10> is not a symbol nor a string
    /home/yahonda/src/github.com/rails/rails/actionpack/lib/abstract_controller/base.rb:226:in 'AbstractController::Base#process_action'
    /home/yahonda/src/github.com/rails/rails/actionpack/lib/abstract_controller/callbacks.rb:261:in 'block in AbstractController::Callbacks#process_action'
    /home/yahonda/src/github.com/rails/rails/activesupport/lib/active_support/callbacks.rb:101:in 'ActiveSupport::Callbacks#run_callbacks'
    /home/yahonda/src/github.com/rails/rails/actionpack/lib/abstract_controller/callbacks.rb:260:in 'AbstractController::Callbacks#process_action'
    /home/yahonda/src/github.com/rails/rails/actionpack/lib/abstract_controller/base.rb:163:in 'AbstractController::Base#process'
    lib/action_mailer/rescuable.rb:29:in 'block in ActionMailer::Rescuable#process'
    lib/action_mailer/rescuable.rb:21:in 'ActionMailer::Rescuable#handle_exceptions'
    lib/action_mailer/rescuable.rb:28:in 'ActionMailer::Rescuable#process'
    /home/yahonda/src/github.com/rails/rails/actionview/lib/action_view/rendering.rb:40:in 'ActionView::Rendering#process'
    lib/action_mailer/base.rb:657:in 'block in ActionMailer::Base#process'
    /home/yahonda/src/github.com/rails/rails/activesupport/lib/active_support/notifications.rb:212:in 'ActiveSupport::Notifications.instrument'
    lib/action_mailer/base.rb:656:in 'ActionMailer::Base#process'
    lib/action_mailer/message_delivery.rb:136:in 'block in ActionMailer::MessageDelivery#processed_mailer'
    <internal:kernel>:91:in 'Kernel#tap'
    lib/action_mailer/message_delivery.rb:135:in 'ActionMailer::MessageDelivery#processed_mailer'
    lib/action_mailer/message_delivery.rb:32:in 'ActionMailer::MessageDelivery#__getobj__'
    /home/yahonda/.rbenv/versions/trunk/lib/ruby/3.4.0+0/delegate.rb:84:in 'Delegator#method_missing'
    test/base_test.rb:468:in 'block in <class:BaseTest>'


bin/test test/base_test.rb:466

.E


... snip ...
100 runs, 119 assertions, 1 failures, 52 errors, 0 skips
```

According to git bisect, this type error reported since 4cbc41d5e5cb6793174d5964975fdb4470323ca1
It does not reproduce without YJIT enabled like `$ bin/test test/base_test.rb --seed 51482`




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