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Feature #16275

Updated by nobu (Nobuyoshi Nakada) 3 months ago

`obj.:method` obj.:method is introduced at r66667 by #12125 and #13581.
It encourages the functional programming style in Ruby.

But this shorthand syntax is just for methods of `self` without arguments.
It causes another feature requests like #16273 (and lambda compositions like #15428).

Such features will introduce a new view of Ruby but no one illustrates the whole picture yet.
I worried about such patch work may cause a conflict with future expansion of functional programing style or a just a garbage feature.

`.:` .: syntax is introduced introduce in 2.7.0 preview1, not released in production yet.
How about reverting at this time and re-introduce with a big picture.

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