Add missing example for Display::fmt

[GuillaumeGomez]

r? @frewsxcv

[frewsxcv]

This is slightly confusing because it looks like a Debug representation. How do you feel about getting rid of the Foo:: in the outputted string?

[GuillaumeGomez]

I always add the enum's name first in case you have multiple wrappings:

enumFoo{A,}enumX{A(Foo),}enumY{A(X),}

[frewsxcv]

I think you're mixing up Debug and Display. Display is for user-facing output. Users shouldn't care about enum namespacing. We don't want to encourage Rust developers to implement Display if their types aren't mean to be displayed to end-users.
How about this as the example:

structPosition{longitude:f32,latitude:f32,}impl fmt::DisplayforPosition{fnfmt(&self,f:&mut fmt::Formatter) -> fmt::Result{write!(f,"({}, {})",self.longitude,self.latitude)}}

This seems a little more realistic than Foo and Bar and Stack ;)

[GuillaumeGomez]

Why so cruel? :O

[GuillaumeGomez]

Updated.

[frewsxcv]

@bors r+ rollup

[bors]

📌 Commit a5a3981 has been approved by frewsxcv