Fix warnings

Author: jberkel

Sources/SQLite/Core/Connection.swift

@@ -579,7 +579,7 @@ public final class Connection {
             } else if result == nil {
                 sqlite3_result_null(context)
             } else {
-                fatalError("unsupported result type: \(result)")
+                fatalError("unsupported result type: \(String(describing: result))")
             }
         }
         var flags = SQLITE_UTF8

Sources/SQLite/Extensions/FTS4.swift

@@ -145,13 +145,14 @@ extension Tokenizer : CustomStringConvertible {
 extension Connection {
 
     public func registerTokenizer(_ submoduleName: String, next: @escaping (String) -> (String, Range<String.Index>)?) throws {
-        try check(_SQLiteRegisterTokenizer(handle, Tokenizer.moduleName, submoduleName) { input, offset, length in
+        try check(_SQLiteRegisterTokenizer(handle, Tokenizer.moduleName, submoduleName) { (
+                input: UnsafePointer<Int8>, offset: UnsafeMutablePointer<Int32>, length: UnsafeMutablePointer<Int32>) in
             let string = String(cString: input)
 
             guard let (token, range) = next(string) else { return nil }
 
             let view = string.utf8
-            offset.pointee += string.substring(to: range.lowerBound).utf8.count
+            offset.pointee += Int32(string.substring(to: range.lowerBound).utf8.count)
             length.pointee = Int32(view.distance(from: range.lowerBound.samePosition(in: view), to: range.upperBound.samePosition(in: view)))
             return token
         })

Tests/SQLiteTests/ConnectionTests.swift

@@ -337,7 +337,7 @@ class ConnectionTests : SQLiteTestCase {
         try! stmt.run()
 
         let deadline = DispatchTime.now() + Double(Int64(10 * NSEC_PER_MSEC)) / Double(NSEC_PER_SEC)
-        _ = DispatchQueue.global(priority: .background).asyncAfter(deadline: deadline, execute: db.interrupt)
+        _ = DispatchQueue(label: "queue", qos: .background).asyncAfter(deadline: deadline, execute: db.interrupt)
         AssertThrows(try stmt.run())
     }