[ruby-core:98574] [Ruby master Bug#16522] Ruby 2.7 logs deprecation warning when Warning[:deprecated] is set to false.

Issue #16522 has been updated by jeremyevans0 (Jeremy Evans).

Backport changed from 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN to 2.5: DONTNEED, 2.6: DONTNEED, 2.7: REQUIRED
Status changed from Open to Closed
File scan-args-deprecated-warn-16522.patch added

I took another look at this and I think we can silence the deprecation warnings with `-W:no-deprecated` even if we can't deduplicate the warnings.  Attached is a patch that implements this.  I'm not sure if the approach in ruby.h is acceptable (rb_scan_args has both an unoptimized version in class.c and an optimized version in ruby.h).

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Bug #16522: Ruby 2.7 logs deprecation warning when Warning[:deprecated] is set to false.  
https://bugs.ruby-lang.org/issues/16522#change-85871

* Author: [e-mail] (Sneha Somwanshi)
* Status: Closed
* Priority: Normal
* ruby -v: 2.7
* Backport: 2.5: DONTNEED, 2.6: DONTNEED, 2.7: REQUIRED
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Hi 

While upgrading our monolithic app to ruby 2.7, we realised that ruby 2.7 is not suppressing all deprecation warnings. 

Here is the test case:

```
~/dev/freeagent (ruby_2_7_0 *%) $ ruby -W:no-deprecated -e 'require "json"; JSON::Ext::Parser.new("hello", {})'
-e:1: warning: Using the last argument as keyword parameters is deprecated
```

The warning is originating from https://github.com/ruby/ruby/blob/647ee6f091eafcce70ffb75ddf7e121e192ab217/class.c#L2054 and setting  `Warning[:deprecated] = false` or `RUBYOPT=-W:no-deprecated -W:no-experimental` does not suppress this warning.

---Files--------------------------------
scan-args-deprecated-warn-16522.patch (6.79 KB)


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