From: "kddnewton (Kevin Newton) via ruby-core" <ruby-core@...>
Date: 2025-01-06T00:57:02+00:00
Subject: [ruby-core:120491] [Ruby master Bug#21001] unexpected nil result from proc with ensure and next

Issue #21001 has been updated by kddnewton (Kevin Newton).

Assignee set to prism

----------------------------------------
Bug #21001: unexpected nil result from proc with ensure and next
https://bugs.ruby-lang.org/issues/21001#change-111275

* Author: aharpervc (Andrew Harper)
* Status: Open
* Assignee: prism
* ruby -v: ruby 3.4.1 (2024-12-25 revision 48d4efcb85) +PRISM [x86_64-linux]
* Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN
----------------------------------------
Hello,

I have noticed a different program behavior in Ruby 3.4 compared to previous versions. This is a simplified example for debugging that returns the expected result in Ruby 3.3 but nil in Ruby 3.4

Here is the example program:

``` ruby
puts "Ruby: #{RUBY_VERSION}"

# okay all versions
# RUN_ARRAY = [1]

# fails ruby 3.4 only
RUN_ARRAY = [1,2]

MAP_PROC = Proc.new do |&blk|
  block_results = []
  RUN_ARRAY.each do |value|
    block_value = blk.call(value)
    block_results.push block_value
  end
  block_results
ensure
  next block_results
end

test_fn_results = MAP_PROC.call do |value|
  break if value > 1
  next value
end

puts test_fn_results.inspect

```

For Ruby 3.3.6 the output is:

```
Ruby: 3.3.6
[1]
```

For Ruby 3.4.1 the output is:

```
Ruby: 3.4.1
nil
```

I am expecting the Ruby 3.3 output even for Ruby 3.4. This appears to be a bug, since the program implementation is unchanged. Perhaps there is a bug in the code that is now only showing up with Ruby 3.4, but that seemed unlikely since it's working as expected in other versions.

Thank you



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