Passing members as closures.

[ddrcoder]

I can't seem to figure out how to pass member functions as closures. I can do this:

fn my_unwrap<T>(o: Option<T>) -> T { o.unwrap() }

// name non-member function
let vals = opts.map(my_unwrap);
// take value, call member
let vals = opts.map(|o| o.unwrap());
// pass member function...?
let vals = opts.map(Option::unwrap); // doesn't compile

But I see no way to pass the actual member function within std::Option. Perhaps I missed something in the documentation?

[ddrcoder]

This particular case could be done with filter_map, I know, but the general question remains.

[alexcrichton]

This will be enabled with something we call "uniform function call syntax", closing as a dupe of #11938

For now, this is not possible, sadly.