Silence warnings from SE-0099

Foundation/NSArray.swift

@@ -166,7 +166,7 @@ public class NSArray : NSObject, NSCopying, NSMutableCopying, NSSecureCoding, NS
     }
 
     public override func isEqual(_ object: AnyObject?) -> Bool {
-        guard let otherObject = object where otherObject is NSArray else {
+        guard let otherObject = object, otherObject is NSArray else {
             return false
         }
         let otherArray = otherObject as! NSArray

Foundation/NSData.swift

@@ -198,15 +198,15 @@ public class NSData : NSObject, NSCopying, NSMutableCopying, NSSecureCoding {
         while i < self.length {
             if i > 0 && i % 4 == 0 {
                 // if there's a limit, and we're at the barrier where we'd add the ellipses, don't add a space.
-                if let limit = limit where self.length > limit && i == self.length - (limit / 2) { /* do nothing */ }
+                if let limit = limit, self.length > limit && i == self.length - (limit / 2) { /* do nothing */ }
                 else { s += " " }
             }
             let byte = buffer[i]
             var byteStr = String(byte, radix: 16, uppercase: false)
             if byte <= 0xf { byteStr = "0\(byteStr)" }
             s += byteStr
             // if we've hit the midpoint of the limit, skip to the last (limit / 2) bytes.
-            if let limit = limit where self.length > limit && i == (limit / 2) - 1 {
+            if let limit = limit, self.length > limit && i == (limit / 2) - 1 {
                 s += " ... "
                 i = self.length - (limit / 2)
             } else {
@@ -515,7 +515,7 @@ extension NSData {
     ///
     ///      This method is invoked in a `try` expression and the caller is responsible for handling any errors in the `catch` clauses of a `do` statement, as described in [Error Handling](https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/ErrorHandling.html#//apple_ref/doc/uid/TP40014097-CH42) in [The Swift Programming Language](https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/index.html#//apple_ref/doc/uid/TP40014097) and [Error Handling](https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/BuildingCocoaApps/AdoptingCocoaDesignPatterns.html#//apple_ref/doc/uid/TP40014216-CH7-ID10) in [Using Swift with Cocoa and Objective-C](https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/BuildingCocoaApps/index.html#//apple_ref/doc/uid/TP40014216).
     public func write(to url: URL, options writeOptionsMask: WritingOptions = []) throws {
-        guard let path = url.path where url.isFileURL == true else {
+        guard let path = url.path, url.isFileURL == true else {
             let userInfo = [NSLocalizedDescriptionKey : "The folder at “\(url)” does not exist or is not a file URL.", // NSLocalizedString() not yet available
                             NSURLErrorKey             : url.absoluteString ?? ""] as Dictionary<String, Any>
             throw NSError(domain: NSCocoaErrorDomain, code: 4, userInfo: userInfo)
@@ -846,7 +846,7 @@ extension NSData {
         let appendByteToResult : (UInt8) -> () = {
             result.append($0)
             currentLineCount += 1
-            if let options = lineOptions where currentLineCount == options.lineLength {
+            if let options = lineOptions, currentLineCount == options.lineLength {
                 result.append(contentsOf: options.separator)
                 currentLineCount = 0
             }

Foundation/NSHTTPCookie.swift

@@ -226,8 +226,7 @@ public class HTTPCookie : NSObject {
         _domain = canonicalDomain
 
         if let
-            secureString = properties[NSHTTPCookieSecure] as? String
-            where secureString.characters.count > 0
+            secureString = properties[NSHTTPCookieSecure] as? String, secureString.characters.count > 0
         {
             _secure = true
         } else {
@@ -236,17 +235,15 @@ public class HTTPCookie : NSObject {
 
         let version: Int
         if let
-            versionString = properties[NSHTTPCookieVersion] as? String
-            where versionString == "1"
+            versionString = properties[NSHTTPCookieVersion] as? String, versionString == "1"
         {
             version = 1
         } else {
             version = 0
         }
         _version = version
 
-        if let portString = properties[NSHTTPCookiePort] as? String
-        where _version == 1 {
+        if let portString = properties[NSHTTPCookiePort] as? String, _version == 1 {
             _portList = portString.characters
                 .split(separator: ",")
                 .flatMap { Int(String($0)) }
@@ -271,8 +268,7 @@ public class HTTPCookie : NSObject {
             }
         } else if
             let maximumAge = properties[NSHTTPCookieMaximumAge] as? String,
-            let secondsFromNow = Int(maximumAge)
-            where _version == 1 {
+            let secondsFromNow = Int(maximumAge), _version == 1 {
             _expiresDate = Date(timeIntervalSinceNow: Double(secondsFromNow))
         } else {
             _expiresDate = nil

Foundation/NSJSONSerialization.swift

@@ -483,7 +483,7 @@ private struct JSONReader {
 
     func consumeWhitespace(_ input: Index) -> Index? {
         var index = input
-        while let (char, nextIndex) = source.takeASCII(index) where JSONReader.whitespaceASCII.contains(char) {
+        while let (char, nextIndex) = source.takeASCII(index), JSONReader.whitespaceASCII.contains(char) {
             index = nextIndex
         }
         return index
@@ -521,7 +521,7 @@ private struct JSONReader {
 
     func takeMatching(_ match: (UInt8) -> Bool) -> ([Character], Index) -> ([Character], Index)? {
         return { input, index in
-            guard let (byte, index) = self.source.takeASCII(index) where match(byte) else {
+            guard let (byte, index) = self.source.takeASCII(index), match(byte) else {
                 return nil
             }
             return (input + [Character(UnicodeScalar(byte))], index)
@@ -601,7 +601,7 @@ private struct JSONReader {
             return (String(UnicodeScalar(codeUnit)), index)
         }
 
-        guard let (trailCodeUnit, finalIndex) = try consumeASCIISequence("\\u", input: index).flatMap(parseCodeUnit) where UTF16.isTrailSurrogate(trailCodeUnit) else {
+        guard let (trailCodeUnit, finalIndex) = try consumeASCIISequence("\\u", input: index).flatMap(parseCodeUnit) , UTF16.isTrailSurrogate(trailCodeUnit) else {
             throw NSError(domain: NSCocoaErrorDomain, code: NSCocoaError.PropertyListReadCorruptError.rawValue, userInfo: [
                 "NSDebugDescription" : "Unable to convert unicode escape sequence (no low-surrogate code point) to UTF8-encoded character at position \(source.distanceFromStart(input))"
             ])
@@ -670,7 +670,7 @@ private struct JSONReader {
         else {
             var numberCharacters = [UInt8]()
             var index = input
-            while let (ascii, nextIndex) = source.takeASCII(index) where JSONReader.numberCodePoints.contains(ascii) {
+            while let (ascii, nextIndex) = source.takeASCII(index), JSONReader.numberCodePoints.contains(ascii) {
                 numberCharacters.append(ascii)
                 index = nextIndex
             }

Foundation/NSOrderedSet.swift

@@ -301,7 +301,7 @@ extension NSOrderedSet {
     public convenience init(array set: [AnyObject], range: NSRange, copyItems flag: Bool) {
         var objects = set
 
-        if let range = range.toRange() where range.count != set.count || flag {
+        if let range = range.toRange(), range.count != set.count || flag {
             objects = [AnyObject]()
             for index in range.indices {
                 let object = set[index] as! NSObject

Foundation/NSSet.swift

@@ -86,7 +86,7 @@ public class NSSet : NSObject, NSCopying, NSMutableCopying, NSSecureCoding, NSCo
             NSRequiresConcreteImplementation()
         }
 
-        guard let obj = object as? NSObject where _storage.contains(obj) else {
+        guard let obj = object as? NSObject, _storage.contains(obj) else {
             return nil
         }
 
@@ -189,7 +189,7 @@ public class NSSet : NSObject, NSCopying, NSMutableCopying, NSSecureCoding, NSCo
     }
 
     public override func isEqual(_ object: AnyObject?) -> Bool {
-        guard let otherObject = object where otherObject is NSSet else {
+        guard let otherObject = object, otherObject is NSSet else {
             return false
         }
         let otherSet = otherObject as! NSSet