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Remove FnArg::Ignored variant #644

@dtolnay

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@dtolnay
trait Trait {
    fn f(u8);
    //   ^^
}

This syntax has been removed in the 2018 edition. If someone still has this syntax in their code, there is a clear way to transition to syntax that work in both editions by prepending _: so we no longer need Syn to parse the old syntax.

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