Rollup merge of rust-lang#49575 - tmccombs:option-filter-stabilize, r=withoutboats

Stabilize `Option::filter`.

Fixes rust-lang#45860

Author: kennytm

src/libcore/option.rs

@@ -628,8 +628,6 @@ impl<T> Option<T> {
     /// # Examples
     ///
     /// ```rust
-    /// #![feature(option_filter)]
-    ///
     /// fn is_even(n: &i32) -> bool {
     ///     n % 2 == 0
     /// }
@@ -639,7 +637,7 @@ impl<T> Option<T> {
     /// assert_eq!(Some(4).filter(is_even), Some(4));
     /// ```
     #[inline]
-    #[unstable(feature = "option_filter", issue = "45860")]
+    #[stable(feature = "option_filter", since = "1.27.0")]
     pub fn filter<P: FnOnce(&T) -> bool>(self, predicate: P) -> Self {
         if let Some(x) = self {
             if predicate(&x) {

src/librustc_typeck/lib.rs

@@ -76,7 +76,6 @@ This API is completely unstable and subject to change.
 #![feature(crate_visibility_modifier)]
 #![feature(from_ref)]
 #![feature(exhaustive_patterns)]
-#![feature(option_filter)]
 #![feature(quote)]
 #![feature(refcell_replace_swap)]
 #![feature(rustc_diagnostic_macros)]