rustfmt-nightly 1.0.2

Tool to find and fix Rust formatting issues
Documentation 
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// Existential type.

#![feature(existential_type)]

pub existential type Adder<F, T>
where
    T: Clone,
    F: Copy,
: Fn(T) -> T;

pub existential type Adderrr<T>: Fn(T) -> T;

impl Foo for Bar {
    existential type E: Trait;
}