A modern programming language that makes developers happier.

kotlinlang

<@U8QM3FD0V> as Mario pointed out Arrow supports both partial application and currying 
<https://github.com/arrow-kt/arrow/blob/master/arrow-syntax/src/main/kotlin/arrow/syntax/function/partials.kt>
<https://github.com/arrow-kt/arrow/blob/master/arrow-syntax/src/main/kotlin/arrow/syntax/function/currying.kt>
I do agree with you that this boilerplate should  not be required and this would be a good lang feature.
While the lang could support both currying and partial application directly I think that a better feature would be abstracting over generics arity in general.