bet 1.1.0

Helps parsing and evaluating binary expression trees
Documentation 
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use crate::*;

/// One of the children of a node
///
/// You probably don't need to use this struct unless
/// you want to inspect the binary expression tree.
#[derive(Debug, Clone, Copy, PartialEq)]
pub enum Child {
    None,
    Node(NodeId),
    Atom(AtomId),
}
impl Child {
    pub fn is_none(self) -> bool {
        matches!(self, Self::None)
    }
    pub fn is_some(self) -> bool {
        !self.is_none()
    }
}