From: "jeremyevans0 (Jeremy Evans) via ruby-core" <ruby-core@...>
Date: 2024-04-22T06:20:19+00:00
Subject: [ruby-core:117641] [Ruby master Bug#20442] Printing class variable inconsistent when using nested hashes

Issue #20442 has been updated by jeremyevans0 (Jeremy Evans).

Status changed from Open to Rejected

Not a bug. For the behavior you want, in `Mock4`

```ruby
  @val = Hash.new{|h, k| h[k] = Hash.new(0)}
```

With `@val = Hash.new(Hash.new(0))`, the `@val['a']` expression returns the `Hash.new(0)` default value, but does not set a value in `@val`.

----------------------------------------
Bug #20442: Printing class variable inconsistent when using nested hashes
https://bugs.ruby-lang.org/issues/20442#change-108052

* Author: k776 (Kieran Pilkington)
* Status: Rejected
* ruby -v: 3.3.0
* Backport: 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN
----------------------------------------
See attached test.rb. I have a class with a class variable. The idea is simple, increment the value and then print out the resulting class var.

```
Mock1
0
1

Mock2
{}
{"a"=>1}

Mock3
{}
{"a"=>1}

Mock4
{}
{}
```

Mock1 through Mock3 are working as expected. But Mock4 does not, it outputs a blank hash, rather than the expected: `{"a"=>{"a"=>1}}`

The value is being set. If I replace the print method with `@val['a']['a']` is outputs the number 1 as expected.

---Files--------------------------------
test.rb (820 Bytes)


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