Bug #16856: Structs accepting keyword arguments issue a warning with Ruby 2.7

• Status: Closed
• Assignee: -
• Target version: -
• ruby -v: ruby 2.7.1p83 (2020-03-31 revision a0c7c23c9c) [x86_64-linux]
• Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN

[iGEL (Johannes Barre)]

This code is issuing a warning with Ruby 2.7, but should not:

class NotFine < Struct.new(:x)
  def initialize(x, arg:)
  end
end

class Fine
  def initialize(x, arg:)
  end
end

NotFine.new(1, arg: 1) # This is causing the warning
Fine.new(1, arg: 1)    # This is not

$ ruby test.rb
test.rb:11: warning: Using the last argument as keyword parameters is deprecated; maybe ** should be added to the call
test.rb:2: warning: The called method `initialize' is defined here

[jeremyevans0 (Jeremy Evans)]

• Status changed from Open to Closed

I believe this was fixed in #16801, which is already marked as required for backport to 2.7. With the master branch, there is no warning for the code.