[ruby-core:90444] [Ruby trunk Bug#15403] Some methods of Date available in Ruby 2.5 are not available since r66329

Issue #15403 has been updated by shevegen (Robert A. Heiler).


> This seems incompatible changes. Is it not possible to make it deprecate
> rather than remove?

You are probably right there. I assume it may not have been intentional
for 2.6.x; perhaps not even to deprecate it but most certainly not for
removal.

In the last developer meeting a few hours ago, for example, matz approved
of Feature #10771 "An easy way to get the source location of a constant"
but it will come in 2.7 or later, not in 2.6:

https://docs.google.com/document/d/1q22gVRNbCIYOQw2djH4UPmT0gxVoBKvjvs0MqX5ILcU/edit

So I assume a similar reasoning applies to the change that you mentioned
here too; otherwise I assume the incompatibility would have been mentioned
in NEWS.

X-mas ruby releases also tend to be for stability; in particular nobu has
been fixing a lot of bugs lately, so I guess the situation here will also
probably be resolved before x-mas. :)

----------------------------------------
Bug #15403: Some methods of Date available in Ruby 2.5 are not available since r66329
https://bugs.ruby-lang.org/issues/15403#change-75602

* Author: y-yagi (Yuji Yaginuma)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 2.6.0dev (2018-12-12 trunk 66357) [x86_64-linux] 
* Backport: 2.4: UNKNOWN, 2.5: UNKNOWN
----------------------------------------
In r66329, some methods were moved to DateTime from Date. 
This makes it not available to use methods that were available in Ruby 2.5, like `hour`.  

It may not have been intentional that these methods could be used in Date. But Rails uses those methods in Date class. 

https://github.com/rails/rails/blob/c4f37cc8c5a3b1de5746146a0f65b22d418cfef4/activesupport/lib/active_support/core_ext/date/calculations.rb#L11
https://github.com/rails/rails/blob/c4f37cc8c5a3b1de5746146a0f65b22d418cfef4/activesupport/lib/active_support/core_ext/date_and_time/calculations.rb#L378  
(CI result: https://travis-ci.org/rails/rails/jobs/466863428#L6781-L6845 ) 

This affect to an old version of Rails too. 
This seems incompatible changes. Is it not possible to make it deprecate rather than remove?




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