[ruby-core:117227] [Ruby master Bug#20348] Memory leak with method kwargs in ERB template

["davidtaylorhq (David Taylor) via ruby-core" <ruby-core@ml.ruby-lang.org>]

Issue #20348 has been reported by davidtaylorhq (David Taylor).

----------------------------------------
Bug #20348: Memory leak with method kwargs in ERB template
https://bugs.ruby-lang.org/issues/20348

* Author: davidtaylorhq (David Taylor)
* Status: Open
* ruby -v: ruby 3.3.0 (2023-12-25 revision 5124f9ac75) [arm64-darwin23]
* Backport: 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN
----------------------------------------
Evaluating ERB templates with kwarg method calls leads to unbounded growth in memory use.

Example script:

```ruby
require "erb"

def noop(kwarg1:); end

template = ERB.new("<%= noop kwarg1: false %>")

50.times do
  10_000.times do
    template.result(binding)
  end
  GC.start;
  puts "Object Count: #{ObjectSpace.count_objects[:TOTAL]}"
end
```

When run, this script will print something like:

```
Object Count: 53825
Object Count: 80432
Object Count: 105811
Object Count: 137331
Object Count: 179491
Object Count: 179491
Object Count: 236389
...
```

This issue does not occur when the keyword argument is replaced with a positional argument.

I can reproduce the issue using Ruby 3.0.6, 3.1.4, 3.2.3 and 3.3.0.

The issue does not reproduce using Ruby 2.7.8.



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