Programmer - In Scala, why can't I partially apply a function without explicitly specifying its argument types?

Programmer Question

This produces an anonymous function as expected (f is a function with three arguments):

f(_, _, _)

What I don't understand is why this doesn't compile, instead giving a "missing parameter type" error:

f(_, _, 27)

I need to specify the types of the underscores explicitly. Shouldn't Scala be able to infer their types given that the parameter types of the function f are known?

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