aster 0.14.0

A libsyntax ast builder
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pub trait Invoke<A> {
    type Result;

    fn invoke(self, arg: A) -> Self::Result;
}

//////////////////////////////////////////////////////////////////////////////

#[derive(Copy, Clone)]
pub struct Identity;

impl<A> Invoke<A> for Identity {
    type Result = A;

    fn invoke(self, arg: A) -> A { arg }
}