docs for str::find say closure but don't use a closuer

[steveklabnik]

https://doc.rust-lang.org/stable/std/primitive.str.html#examples-21

More complex patterns with closures:

... but it uses point-free style, not closures.

We should probably show both.

[pvdrz]

I'd like to take care of this one

[steveklabnik]

@christianpoveda that'd be great! Do you know what needs to be done, or do you need some help/advice?

[pvdrz]

If I understand, you want to change s.find(char::foo) by s.find(|x| x.foo()), right?

[LeopoldArkham]

It would be nice to have both so people still know they can use UFCS syntax (as long as it takes a char and returns a boolean) which is cleaner in trivial cases.
Perhaps add an example that looks for a delimiter symbol (-/_.)

[steveklabnik]

If I understand, you want to change s.find(char::foo) by s.find(|x| x.foo()), right?

I'd say "add" rather than change, it's nice to show both.

@LeopoldArkham just so you know, it's not UFCS anymore, but fully qualified syntax.

[LeopoldArkham]

TIL; Thank you steve!