Issue #16522 has been reported by snehasomwanshi / gmail.com (Sneha Somwanshi).

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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

* Author: snehasomwanshi / gmail.com (Sneha Somwanshi)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: 2.7
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN
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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 `RUBY_OPT=-W:no-deprecated -W:no-experimental` does not suppress this warning.



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