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diff --git a/Firebase/Messaging/FIRMessagingDefines.h b/Firebase/Messaging/FIRMessagingDefines.h
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+/*
+ * Copyright 2017 Google
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef FIRMessaging_xcodeproj_FIRMessagingDefines_h
+#define FIRMessaging_xcodeproj_FIRMessagingDefines_h
+
+#define _FIRMessaging_VERBOSE_LOGGING 1
+
+// Verbose Logging
+#if (_FIRMessaging_VERBOSE_LOGGING)
+#define FIRMessaging_DEV_VERBOSE_LOG(...) NSLog(__VA_ARGS__)
+#else
+#define FIRMessaging_DEV_VERBOSE_LOG(...) do { } while (0)
+#endif // FIRMessaging_VERBOSE_LOGGING
+
+
+// FIRMessaging_FAIL
+#ifdef DEBUG
+#define FIRMessaging_FAIL(format, ...) \
+do { \
+  NSLog(format, ##__VA_ARGS__); \
+  __builtin_trap(); \
+} while (false)
+#else
+#define FIRMessaging_FAIL(...) do { } while (0)
+#endif
+
+
+// WEAKIFY & STRONGIFY
+// Helper macro.
+#define _FIRMessaging_WEAKNAME(VAR) VAR ## _weak_
+
+#define FIRMessaging_WEAKIFY(VAR) __weak __typeof__(VAR) _FIRMessaging_WEAKNAME(VAR) = (VAR);
+
+#define FIRMessaging_STRONGIFY(VAR) \
+_Pragma("clang diagnostic push") \
+_Pragma("clang diagnostic ignored \"-Wshadow\"") \
+__strong __typeof__(VAR) VAR = _FIRMessaging_WEAKNAME(VAR); \
+_Pragma("clang diagnostic pop")
+
+
+// Type Conversions (used for NSInteger etc)
+#ifndef _FIRMessaging_L
+#define _FIRMessaging_L(v) (long)(v)
+#endif
+
+#ifndef _FIRMessaging_UL
+#define _FIRMessaging_UL(v) (unsigned long)(v)
+#endif
+
+#endif
+
+// Debug Assert
+#ifndef _FIRMessagingDevAssert
+// we directly invoke the NSAssert handler so we can pass on the varargs
+// (NSAssert doesn't have a macro we can use that takes varargs)
+#if !defined(NS_BLOCK_ASSERTIONS)
+#define _FIRMessagingDevAssert(condition, ...)                                       \
+  do {                                                                      \
+    if (!(condition)) {                                                     \
+      [[NSAssertionHandler currentHandler]                                  \
+          handleFailureInFunction:(NSString *)                              \
+                                      [NSString stringWithUTF8String:__PRETTY_FUNCTION__] \
+                             file:(NSString *)[NSString stringWithUTF8String:__FILE__]  \
+                       lineNumber:__LINE__                                  \
+                      description:__VA_ARGS__];                             \
+    }                                                                       \
+  } while(0)
+#else // !defined(NS_BLOCK_ASSERTIONS)
+#define _FIRMessagingDevAssert(condition, ...) do { } while (0)
+#endif // !defined(NS_BLOCK_ASSERTIONS)
+
+#endif // _FIRMessagingDevAssert
+
+// Invalidates the initializer from which it's called.
+#ifndef FIRMessagingInvalidateInitializer
+#define FIRMessagingInvalidateInitializer() \
+  do { \
+    [self class]; /* Avoid warning of dead store to |self|. */ \
+    _FIRMessagingDevAssert(NO, @"Invalid initializer."); \
+    return nil; \
+  } while (0)
+#endif