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kotlinlang

I'm confused by a paragraph in the <https://kotlinlang.org/docs/fun-interfaces.html#migration-from-an-interface-with-constructor-function-to-a-functional-interface|documentation on functional interfaces>:
&gt; 
&gt; ```fun interface Printer {
&gt;     fun print()
&gt; }```
&gt; 
&gt; Its constructor will be created implicitly, and any code using the `::Printer` function reference will compile. For example:
&gt; ```documentsStorage.addPrinter(::Printer)```
&gt; 
On this page, the `addPrinter` function is not mentioned anywhere. What would its parameter type be, and how would it be used?

probably:
```fun DocumentsStorage.addPrinter(printer: (() -&gt; Unit) -&gt; Printer)```
Not sure how useful it really is to be honest.

For type-related questions btw, you can write some of the code in Idea, and then Ctrl+Shift+P on it to see its type

given that the code above it has
```fun Printer(block: () -&gt; Unit): Printer```
that is the declaration `::Printer` was referencing previously, and the docs say that works with `fun interface` and no additional function instead