bowling 0.0.1

A crate to deal with bowling scoring.
Documentation 
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use std::str::FromStr;
use failure::Error;

#[derive(Debug, Fail)]
enum ThrowParseError {
    #[fail(display = "invalid pin amount: {}", pins)]
    InvalidPinAmount { pins: usize },
}

#[derive(Clone, Debug, Eq, PartialEq)]
pub enum ThrowType {
    Regular,
    Strike,
    Spare,
}

#[derive(Clone, Debug, Eq, PartialEq)]
pub struct Throw {
    throw_type: ThrowType,
    pin_count: u8,
    pin_state: Vec<bool>,
}

impl Throw {
    pub fn try_from_str(line: &str) -> Result<Throw, Error> {
        let mut pin_count = 0;
        let pin_state = line.split_whitespace()
            .map(|s| {
                let num = u8::from_str(s)?;
                if num > 0 {
                    pin_count += 1;
                }
                Ok(num > 0)
            })
            .collect::<Result<Vec<_>, _>>();

        if pin_state.is_err() {
            Err(pin_state.unwrap_err())
        } else if pin_state.as_ref().unwrap().len() != 10 {
            Err(ThrowParseError::InvalidPinAmount { pins: pin_state.unwrap().len() }.into())
        } else {
            Ok(Throw {
                throw_type: ThrowType::Regular,
                pin_count: pin_count,
                pin_state: pin_state.unwrap(),
            })
        }
    }

    pub fn set_throw_type(&mut self, throw_type: ThrowType) {
        self.throw_type = throw_type;
    }

    pub fn throw_type(&self) -> &ThrowType {
        &self.throw_type
    }

    pub fn pin_count(&self) -> u8 {
        self.pin_count
    }
}