Revert count(where:)

(cherry picked from commit 779ea19)

Author: airspeedswift

benchmark/CMakeLists.txt

@@ -56,7 +56,6 @@ set(SWIFT_BENCH_MODULES
     single-source/Chars
     single-source/ClassArrayGetter
     single-source/Combos
-    single-source/CountAlgo
     single-source/DataBenchmarks
     single-source/DeadArray
     single-source/DictOfArraysToArrayOfDicts

benchmark/single-source/CountAlgo.swift

@@ -44,7 +44,6 @@ import CharacterProperties
 import Chars
 import ClassArrayGetter
 import Combos
-import CountAlgo
 import DataBenchmarks
 import DeadArray
 import DictOfArraysToArrayOfDicts
@@ -213,7 +212,6 @@ registerBenchmark(CharacterPropertiesStashedMemo)
 registerBenchmark(CharacterPropertiesPrecomputed)
 registerBenchmark(Chars)
 registerBenchmark(Combos)
-registerBenchmark(CountAlgo)
 registerBenchmark(ClassArrayGetter)
 registerBenchmark(DataBenchmarks)
 registerBenchmark(DeadArray)

benchmark/utils/main.swift

@@ -572,50 +572,6 @@ extension Sequence where Element : Equatable {
   }
 }
 
-//===----------------------------------------------------------------------===//
-// count(where:)
-//===----------------------------------------------------------------------===//
-
-extension Sequence {
-  /// Returns the number of elements in the sequence that satisfy the given
-  /// predicate.
-  ///
-  /// You can use this method to count the number of elements that pass a test.
-  /// The following example finds the number of names that are fewer than
-  /// five characters long:
-  ///
-  ///     let names = ["Jacqueline", "Ian", "Amy", "Juan", "Soroush", "Tiffany"]
-  ///     let shortNameCount = names.count(where: { $0.count < 5 })
-  ///     // shortNameCount == 3
-  ///
-  /// To find the number of times a specific element appears in the sequence,
-  /// use the equal to operator (`==`) in the closure to test for a match.
-  ///
-  ///     let birds = ["duck", "duck", "duck", "duck", "goose"]
-  ///     let duckCount = birds.count(where: { $0 == "duck" })
-  ///     // duckCount == 4
-  ///
-  /// The sequence must be finite.
-  ///
-  /// - Parameter predicate: A closure that takes each element of the sequence
-  ///   as its argument and returns a Boolean value indicating whether
-  ///   the element should be included in the count.
-  /// - Returns: The number of elements in the sequence that satisfy the given
-  ///   predicate.
-  @inlinable
-  public func count(
-    where predicate: (Element) throws -> Bool
-  ) rethrows -> Int {
-    var count = 0
-    for e in self {
-      if try predicate(e) {
-        count += 1
-      }
-    }
-    return count
-  }
-}
-
 //===----------------------------------------------------------------------===//
 // reduce()
 //===----------------------------------------------------------------------===//

stdlib/public/core/SequenceAlgorithms.swift

@@ -148,3 +148,5 @@ Subscript String.UnicodeScalarView.subscript(_:) has been removed
 Subscript Substring.subscript(_:) has been removed
 
 Func Collection.makeIterator() has self access kind changing from NonMutating to __Consuming
+
+Func Sequence.count(where:) has been removed

test/api-digester/Outputs/stability-stdlib-abi.swift.expected

@@ -4,3 +4,5 @@ Protocol SIMD has added inherited protocol Decodable
 Protocol SIMD has added inherited protocol Encodable
 Protocol SIMD has generic signature change from <Self : CustomStringConvertible, Self : ExpressibleByArrayLiteral, Self : Hashable, Self : SIMDStorage, Self.MaskStorage : SIMD, Self.MaskStorage.Scalar : FixedWidthInteger, Self.MaskStorage.Scalar : SignedInteger> to <Self : CustomStringConvertible, Self : Decodable, Self : Encodable, Self : ExpressibleByArrayLiteral, Self : Hashable, Self : SIMDStorage, Self.MaskStorage : SIMD, Self.MaskStorage.Scalar : FixedWidthInteger, Self.MaskStorage.Scalar : SignedInteger>
 Protocol SIMDStorage has generic signature change from <Self.Scalar : Hashable> to <Self.Scalar : Decodable, Self.Scalar : Encodable, Self.Scalar : Hashable>
+
+Func Sequence.count(where:) has been removed

test/api-digester/Outputs/stability-stdlib-source.swift.expected

@@ -628,21 +628,6 @@ SequenceTypeTests.test("allSatisfy/Predicate") {
   }
 }
 
-//===----------------------------------------------------------------------===//
-// count(where:)
-//===----------------------------------------------------------------------===//
-
-SequenceTypeTests.test("count/Predicate") {
-  for test in predicateCountTests {
-    let s = MinimalSequence<OpaqueValue<Int>>(
-      elements: test.sequence.map { OpaqueValue($0) })
-    expectEqual(
-      test.expected,
-      s.count(where: { test.includeElement($0.value) }),
-      stackTrace: SourceLocStack().with(test.loc))
-  }
-}
-
 //===----------------------------------------------------------------------===//
 // reduce()
 //===----------------------------------------------------------------------===//