remove bounds from vec and linkedlist ExtractIf

since drain-on-drop behavior was removed those bounds
no longer serve a purpose

Author: the8472

library/alloc/src/collections/linked_list.rs

@@ -1939,8 +1939,7 @@ pub struct ExtractIf<
     T: 'a,
     F: 'a,
     #[unstable(feature = "allocator_api", issue = "32838")] A: Allocator = Global,
-> where
-    F: FnMut(&mut T) -> bool,
+>
 {
     list: &'a mut LinkedList<T, A>,
     it: Option<NonNull<Node<T>>>,
@@ -1980,8 +1979,6 @@ where
 
 #[unstable(feature = "extract_if", reason = "recently added", issue = "43244")]
 impl<T: fmt::Debug, F> fmt::Debug for ExtractIf<'_, T, F>
-where
-    F: FnMut(&mut T) -> bool,
 {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         f.debug_tuple("ExtractIf").field(&self.list).finish()

library/alloc/src/vec/extract_if.rs

@@ -24,8 +24,7 @@ pub struct ExtractIf<
     T,
     F,
     #[unstable(feature = "allocator_api", issue = "32838")] A: Allocator = Global,
-> where
-    F: FnMut(&mut T) -> bool,
+>
 {
     pub(super) vec: &'a mut Vec<T, A>,
     /// The index of the item that will be inspected by the next call to `next`.
@@ -41,8 +40,6 @@ pub struct ExtractIf<
 }
 
 impl<'a, T, F, A: Allocator> ExtractIf<'a, T, F, A>
-where
-    F: FnMut(&mut T) -> bool,
 {
     pub(super) fn new<R: RangeBounds<usize>>(vec: &'a mut Vec<T, A>, pred: F, range: R) -> Self {
         let old_len = vec.len();
@@ -101,8 +98,6 @@ where
 
 #[unstable(feature = "extract_if", reason = "recently added", issue = "43244")]
 impl<T, F, A: Allocator> Drop for ExtractIf<'_, T, F, A>
-where
-    F: FnMut(&mut T) -> bool,
 {
     fn drop(&mut self) {
         unsafe {