purr 0.9.0

Primitives for reading and writing the SMILES language in Rust.
Documentation 
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/// An error resulting from depth-first traversal of a graph
/// representation.
#[derive(Debug,PartialEq)]
pub enum Error {
    HalfBond(usize, usize),
    DuplicateBond(usize, usize),
    UnknownTarget(usize, usize),
    IncompatibleBond(usize, usize),
    Loop(usize)
}