rust/tests/target/trailing_commas.rs

// rustfmt-match_block_trailing_comma: true
// rustfmt-trailing_comma: Always

fn main() {
    match foo {
        x => {},
        y => {
            foo();
        },
        _ => x,
    }
}

fn f<
    S, T,
>(
    x: T,
    y: S,
) -> T
where
    T: P,
    S: Q,
{
    x
}

impl Trait for T
where
    T: P,
{
    fn f(x: T) -> T
    where
        T: Q + R,
    {
        x
    }
}

struct Pair<
    S, T,
> where
    T: P,
    S: P + Q,
{
    a: T,
    b: S,
}

struct TupPair<
    S, T,
>(S, T,)
where
    T: P,
    S: P + Q;

enum E<
    S, T,
> where
    S: P,
    T: P,
{
    A { a: T, },
}

type Double<
    T,
> where
    T: P,
    T: Q = Pair<
    T, T,
>;

extern "C" {
    fn f<
        S, T,
    >(
        x: T,
        y: S,
    ) -> T
    where
        T: P,
        S: Q;
}

trait Q<
    S, T,
> where
    T: P,
    S: R,
{
    fn f<
        U, V,
    >(
        self,
        x: T,
        y: S,
        z: U,
    ) -> Self
    where
        U: P,
        V: P;
}