Implement Copy, Clone, PartialEq and Eq for core::fmt::Alignment
Alignment is a fieldless exhaustive enum, so it is already possible to
clone and compare it by matching, but it is inconvenient to do so. For
example, if one would like to create a struct describing a formatter
configuration and provide a clone implementation:
```rust
pub struct Format {
fill: char,
width: Option<usize>,
align: fmt::Alignment,
}
impl Clone for Format {
fn clone(&self) -> Self {
Format {
align: match self.align {
fmt::Alignment::Left => fmt::Alignment::Left,
fmt::Alignment::Right => fmt::Alignment::Right,
fmt::Alignment::Center => fmt::Alignment::Center,
},
.. *self
}
}
}
```
Derive Copy, Clone, PartialEq, and Eq for Alignment for convenience.
#[stable(feature = "fmt_flags_align", since = "1.28.0")]
#[cfg_attr(not(test), rustc_diagnostic_item = "Alignment")]
/// Possible alignments returned by `Formatter::align`
-#[derive(Debug)]
+#[derive(Copy, Clone, Debug, PartialEq, Eq)]
pub enum Alignment {
#[stable(feature = "fmt_flags_align", since = "1.28.0")]
/// Indication that contents should be left-aligned.