diff options
Diffstat (limited to '')
| -rw-r--r-- | library/core/src/fmt/mod.rs | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/library/core/src/fmt/mod.rs b/library/core/src/fmt/mod.rs index 905212eb3..c8d285505 100644 --- a/library/core/src/fmt/mod.rs +++ b/library/core/src/fmt/mod.rs @@ -709,12 +709,19 @@ pub use macros::Debug; /// Format trait for an empty format, `{}`. /// +/// Implementing this trait for a type will automatically implement the +/// [`ToString`][tostring] trait for the type, allowing the usage +/// of the [`.to_string()`][tostring_function] method. Prefer implementing +/// the `Display` trait for a type, rather than [`ToString`][tostring]. +/// /// `Display` is similar to [`Debug`], but `Display` is for user-facing /// output, and so cannot be derived. /// /// For more information on formatters, see [the module-level documentation][module]. /// /// [module]: ../../std/fmt/index.html +/// [tostring]: ../../std/string/trait.ToString.html +/// [tostring_function]: ../../std/string/trait.ToString.html#tymethod.to_string /// /// # Examples /// @@ -2603,7 +2610,7 @@ impl Debug for () { #[stable(feature = "rust1", since = "1.0.0")] impl<T: ?Sized> Debug for PhantomData<T> { fn fmt(&self, f: &mut Formatter<'_>) -> Result { - f.debug_struct("PhantomData").finish() + write!(f, "PhantomData<{}>", crate::any::type_name::<T>()) } } |