Merge pull request #1106 from bubski/warnings

Author: swift-ci

Foundation/Data.swift

@@ -1514,7 +1514,6 @@ public struct Data : ReferenceConvertible, Equatable, Hashable, RandomAccessColl
     @inline(__always)
     public func subdata(in range: Range<Index>) -> Data {
         _validateRange(range)
-        let length = count
         if count == 0 {
             return Data()
         }

TestFoundation/HTTPServer.swift

@@ -106,7 +106,7 @@ class _TCPSocket {
     }
 
     func writeRawData(_ data: Data) throws {
-        let x = try data.withUnsafeBytes { ptr in
+        _ = try data.withUnsafeBytes { ptr in
             try attempt("write", valid: isNotNegative, CInt(write(connectionSocket, ptr, data.count)))
         }
     }

TestFoundation/TestNSIndexPath.swift

@@ -277,8 +277,10 @@ class TestNSIndexPath: XCTestCase {
         let ip2: IndexPath = [1, 1, 1]
 
         XCTAssertNotEqual(ip1.hashValue, ip2.hashValue)
-        
-        IndexPath(indexes: [Int.max >> 8, 2, Int.max >> 36]).hashValue // this should not cause an overflow crash
+
+        // this should not cause an overflow crash
+        let hash: Int? = IndexPath(indexes: [Int.max >> 8, 2, Int.max >> 36]).hashValue
+        XCTAssertNotNil(hash)
     }
 
     func testEquality() {