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//- // Copyright 2017, 2018 The proptest developers // // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your // option. This file may not be copied, modified, or distributed // except according to those terms. use crate::std_facade::{fmt, Box, Cow, String}; /// The reason for why something, such as a generated value, was rejected. /// /// Currently this is merely a wrapper around a message, but more properties /// may be added in the future. /// /// This is constructed via `.into()` on a `String`, `&'static str`, or /// `Box<str>`. #[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)] pub struct Reason(Cow<'static, str>); impl Reason { /// Return the message for this `Reason`. /// /// The message is intended for human consumption, and is not guaranteed to /// have any format in particular. pub fn message(&self) -> &str { &*self.0 } } impl From<&'static str> for Reason { fn from(s: &'static str) -> Self { Reason(s.into()) } } impl From<String> for Reason { fn from(s: String) -> Self { Reason(s.into()) } } impl From<Box<str>> for Reason { fn from(s: Box<str>) -> Self { Reason(String::from(s).into()) } } impl fmt::Display for Reason { fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { fmt::Display::fmt(self.message(), f) } }