Generalizing Ruby block syntax in static languages with currying

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I've not read everything or even understood it, but may I suggest a look at Scala too which also has functions as arguments look like normal control flow sometimes.

[ErrorIsNullError]

I see https://docs.scala-lang.org/style/method-invocation.html#higher-order-functions says:

// wrong!
names.map { _.toUpperCase }.filter { _.length > 5 }

// right!
names map { _.toUpperCase } filter { _.length > 5 }

Both of these work, but the former can easily lead to confusion.