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use std::error;
use std::fmt;

/// Returned when borrowing fails.
#[derive(Debug)]
pub struct InvalidThreadAccess;

impl fmt::Display for InvalidThreadAccess {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, "fragile value accessed from foreign thread")
    }
}

impl error::Error for InvalidThreadAccess {}