CODEWITHSUNDEEP
rubytypesrbssteep
Paul W
Paul W

Reputation: 123

RBS optional block handling

I'm trying to add RBS information to a ruby gem and am wondering if there is a way to make this work. Take this code:

def some_method(&block)
   if block
      foo = block.call
   end
end

and this signature:

def some_method: () ?{ () -> String } -> void

When I run it through steep check I get an error message like this:

[error] Type `nil` does not have method `call`
│ Diagnostic ID: Ruby::NoMethod
│
└           foo = block.call
                       ~~~~

Is there a good way to resolve this? I need &block to be optional, and at that point in the code I already know block can't be nil, but I don't know how tell RBS about that.

EDIT: I know I could just change the code to be foo = block&.call but ideally I'd like to be able to keep the code the same.

Upvotes: 0

Views: 91

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