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Seattle.rb style no longer valid in Ruby 2.4.2 when curly braces are used. #4793

danielpclark opened this issue Sep 25, 2017 · 1 comment


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@danielpclark danielpclark commented Sep 25, 2017

As of Ruby 2.4.2 there is a breaking change for any Ruby code that doesn't use parenthesis on a literal before curly braces.

This is no longer allowed:

define_method :some_method_name { "asdf" }

This must now be either:

define_method(:some_method_name) { "asdf" }


define_method :some_method_name do "asdf" end

According to Ruby Bug reports and this is the way it has to be.

A brace block has higher precedence and is bound to the previous expression, and a literal cannot be a method call and have a block. - Nobuyoshi Nakada

Expected behavior

When Rubocop finds any literal followed by curly braces suggest wrapping the literal in parenthesis as a parameter or substituting the curly braces for do and end.

Anyone planning to upgrade their project to Ruby 2.4.2 or higher may want to have this pointed out with a cop.


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@bbatsov bbatsov commented Sep 18, 2018

I'm closing this ticket due to no recent activity. Feel free to re-open it if you ever come back to it.

@bbatsov bbatsov closed this Sep 18, 2018
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