Stabilize mem::take (mem_take)

Tracking issue: https://github.com/rust-lang/rust/issues/61129

src/liballoc/lib.rs

@@ -121,7 +121,6 @@
 #![feature(maybe_uninit_extra, maybe_uninit_slice)]
 #![feature(alloc_layout_extra)]
 #![feature(try_trait)]
-#![feature(mem_take)]
 #![feature(associated_type_bounds)]
 
 // Allow testing this library

src/libcore/lib.rs

@@ -127,7 +127,6 @@
 #![feature(adx_target_feature)]
 #![feature(maybe_uninit_slice)]
 #![feature(external_doc)]
-#![feature(mem_take)]
 #![feature(associated_type_bounds)]
 
 #[prelude_import]

src/libcore/mem/mod.rs

@@ -520,8 +520,6 @@ pub fn swap<T>(x: &mut T, y: &mut T) {
 /// A simple example:
 ///
 /// ```
-/// #![feature(mem_take)]
-///
 /// use std::mem;
 ///
 /// let mut v: Vec<i32> = vec![1, 2];
@@ -552,8 +550,6 @@ pub fn swap<T>(x: &mut T, y: &mut T) {
 /// `self`, allowing it to be returned:
 ///
 /// ```
-/// #![feature(mem_take)]
-///
 /// use std::mem;
 ///
 /// # struct Buffer<T> { buf: Vec<T> }
@@ -572,7 +568,7 @@ pub fn swap<T>(x: &mut T, y: &mut T) {
 ///
 /// [`Clone`]: ../../std/clone/trait.Clone.html
 #[inline]
-#[unstable(feature = "mem_take", issue = "61129")]
+#[stable(feature = "mem_take", since = "1.40.0")]
 pub fn take<T: Default>(dest: &mut T) -> T {
     replace(dest, T::default())
 }

src/libproc_macro/lib.rs

@@ -25,7 +25,6 @@
 #![feature(extern_types)]
 #![feature(in_band_lifetimes)]
 #![feature(optin_builtin_traits)]
-#![feature(mem_take)]
 #![feature(non_exhaustive)]
 #![feature(rustc_attrs)]
 #![feature(specialization)]

src/librustc/lib.rs

@@ -58,7 +58,6 @@
 #![feature(crate_visibility_modifier)]
 #![feature(proc_macro_hygiene)]
 #![feature(log_syntax)]
-#![feature(mem_take)]
 #![feature(associated_type_bounds)]
 #![feature(rustc_attrs)]
 

src/librustc_codegen_llvm/lib.rs

@@ -19,7 +19,6 @@
 #![feature(link_args)]
 #![feature(static_nobundle)]
 #![feature(trusted_len)]
-#![feature(mem_take)]
 
 use back::write::{create_target_machine, create_informational_target_machine};
 use syntax_pos::symbol::Symbol;

src/librustc_codegen_ssa/lib.rs

@@ -10,7 +10,6 @@
 #![feature(in_band_lifetimes)]
 #![feature(nll)]
 #![feature(trusted_len)]
-#![feature(mem_take)]
 #![feature(associated_type_bounds)]
 
 #![recursion_limit="256"]

src/librustc_mir/lib.rs

@@ -22,7 +22,6 @@ Rust MIR: a lowered representation of Rust. Also: an experiment!
 #![feature(slice_concat_ext)]
 #![feature(trusted_len)]
 #![feature(try_blocks)]
-#![feature(mem_take)]
 #![feature(associated_type_bounds)]
 #![feature(range_is_empty)]
 #![feature(stmt_expr_attributes)]

src/librustc_resolve/lib.rs

@@ -11,7 +11,6 @@
 
 #![feature(crate_visibility_modifier)]
 #![feature(label_break_value)]
-#![feature(mem_take)]
 #![feature(nll)]
 
 #![recursion_limit="256"]

src/librustc_typeck/lib.rs

@@ -67,7 +67,6 @@ This API is completely unstable and subject to change.
 #![feature(nll)]
 #![feature(slice_patterns)]
 #![feature(never_type)]
-#![feature(mem_take)]
 
 #![recursion_limit="256"]
 

src/librustdoc/lib.rs

@@ -15,7 +15,6 @@
 #![feature(const_fn)]
 #![feature(drain_filter)]
 #![feature(never_type)]
-#![feature(mem_take)]
 #![feature(unicode_internals)]
 
 #![recursion_limit="256"]

src/libstd/lib.rs

@@ -277,7 +277,6 @@
 #![feature(log_syntax)]
 #![feature(maybe_uninit_ref)]
 #![feature(maybe_uninit_slice)]
-#![feature(mem_take)]
 #![feature(needs_panic_runtime)]
 #![feature(never_type)]
 #![feature(nll)]

src/libsyntax/lib.rs

@@ -12,7 +12,6 @@
 #![feature(const_transmute)]
 #![feature(crate_visibility_modifier)]
 #![feature(label_break_value)]
-#![feature(mem_take)]
 #![feature(nll)]
 #![feature(proc_macro_diagnostic)]
 #![feature(proc_macro_internals)]

src/libsyntax_ext/lib.rs

@@ -5,7 +5,6 @@
 
 #![feature(crate_visibility_modifier)]
 #![feature(decl_macro)]
-#![feature(mem_take)]
 #![feature(nll)]
 #![feature(proc_macro_internals)]
 #![feature(proc_macro_quote)]