Pretty generation produces incorrect indentation with 2.11.x

[Bo98]

Using:

ruby 3.4.3 (2025-04-14 revision d0b7e5b6a0) +PRISM [arm64-darwin23]

Test script:

require "json"
require "uri"

test = {
  a: {
    b: URI("https://example.com"),
  },
  c: "d",
}
puts JSON.pretty_generate(test)

Output with 2.10.2:

$ cat Gemfile
source "https://rubygems.org"

gem "json", "=2.10.2"
$ bundle exec ruby test.rb
{
  "a": {
    "b": "https://example.com"
  },
  "c": "d"
}

Output with 2.11.2:

$ cat Gemfile             
source "https://rubygems.org"

gem "json", "=2.11.2"
$ bundle exec ruby test.rb
{
  "a": {
    "b": "https://example.com"
  },
    "c": "d"
}

---

Above example was trying to give a real-world use case (URIs). A simpler example for an rspec would be something like:

require "json"

class A
  def to_s = "value"
end
   
test = {
  a: {  
    b: A.new,
  },
  c: "d",
}
puts JSON.pretty_generate(test)

$ bundle exec ruby test.rb
{
  "a": {
    "b": "value"
  },
    "c": "d"
}

[byroot]

Thanks you for the report. I'm able to reproduce, I'll figure out a fix.

[byroot]

2.11.3 is out with the fix.