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16 changes: 16 additions & 0 deletions src/libcore/fmt/mod.rs
Original file line number Diff line number Diff line change
Expand Up @@ -81,6 +81,22 @@ pub type Result = result::Result<(), Error>;
/// This type does not support transmission of an error other than that an error
/// occurred. Any extra information must be arranged to be transmitted through
/// some other means.
///
/// An important thing to remember is that the type `fmt::Error` should not be
/// confused with `std::io::Error` or `std::error::Error`, which you may also
/// have in scope.
///
/// # Examples
///
/// ```rust
/// use std::fmt::{self, write};
///
/// let mut output = String::new();
/// match write(&mut output, format_args!("Hello {}!", "world")) {
/// Err(fmt::Error) => panic!("An error occurred"),
/// _ => (),
/// }
/// ```
#[stable(feature = "rust1", since = "1.0.0")]
#[derive(Copy, Clone, Debug, Default, Eq, Hash, Ord, PartialEq, PartialOrd)]
pub struct Error;
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