Rollup merge of rust-lang#113469 - JohnTitor:rm-default-free-fn, r=Amanieu

Remove `default_free_fn` feature

Closes rust-lang#73014
r? `@Amanieu`

Author: matthiaskrgr

library/core/src/default.rs

@@ -133,51 +133,6 @@ pub trait Default: Sized {
     fn default() -> Self;
 }
 
-/// Return the default value of a type according to the `Default` trait.
-///
-/// The type to return is inferred from context; this is equivalent to
-/// `Default::default()` but shorter to type.
-///
-/// For example:
-/// ```
-/// #![feature(default_free_fn)]
-///
-/// use std::default::default;
-///
-/// #[derive(Default)]
-/// struct AppConfig {
-///     foo: FooConfig,
-///     bar: BarConfig,
-/// }
-///
-/// #[derive(Default)]
-/// struct FooConfig {
-///     foo: i32,
-/// }
-///
-/// #[derive(Default)]
-/// struct BarConfig {
-///     bar: f32,
-///     baz: u8,
-/// }
-///
-/// fn main() {
-///     let options = AppConfig {
-///         foo: default(),
-///         bar: BarConfig {
-///             bar: 10.1,
-///             ..default()
-///         },
-///     };
-/// }
-/// ```
-#[unstable(feature = "default_free_fn", issue = "73014")]
-#[must_use]
-#[inline]
-pub fn default<T: Default>() -> T {
-    Default::default()
-}
-
 /// Derive macro generating an impl of the trait `Default`.
 #[rustc_builtin_macro(Default, attributes(default))]
 #[stable(feature = "builtin_macro_prelude", since = "1.38.0")]

src/doc/unstable-book/src/library-features/default-free-fn.md

@@ -1,18 +1,3 @@
-error[E0425]: cannot find function `default` in this scope
-  --> $DIR/issue-2356.rs:31:5
-   |
-LL |     default();
-   |     ^^^^^^^
-   |
-help: you might have meant to call the associated function
-   |
-LL |     Self::default();
-   |     ~~~~~~~~~~~~~
-help: consider importing this function
-   |
-LL + use std::default::default;
-   |
-
 error[E0425]: cannot find value `whiskers` in this scope
   --> $DIR/issue-2356.rs:39:5
    |
@@ -64,6 +49,12 @@ error[E0425]: cannot find function `clone` in this scope
 LL |     clone();
    |     ^^^^^ help: you might have meant to call the method: `self.clone`
 
+error[E0425]: cannot find function `default` in this scope
+  --> $DIR/issue-2356.rs:31:5
+   |
+LL |     default();
+   |     ^^^^^^^ help: you might have meant to call the associated function: `Self::default`
+
 error[E0425]: cannot find function `shave` in this scope
   --> $DIR/issue-2356.rs:41:5
    |