我们从Fabric / Crashlytics获得的一些日志如下所示，我们知道它是由超出范围引起的 std :: map＆lt;＆gt;，但这没有多大帮助，所有的原始信息都丢失了，有什么方法可以找到 抛出异常？
#0. Crashed: com.twitter.crashlytics.ios.exception
0 Foo Bar 0x102874c04 CLSProcessRecordAllThreads + 4577168
1 Foo Bar 0x102874c04 CLSProcessRecordAllThreads + 4577168
2 Foo Bar 0x102874ac0 CLSProcessRecordAllThreads + 4576844
3 Foo Bar 0x102864810 CLSHandler + 4510620
4 Foo Bar 0x102872c1c __CLSExceptionRecord_block_invoke + 4569000
5 libdispatch.dylib 0x1807ed048 _dispatch_client_callout + 16
6 libdispatch.dylib 0x1807f5ae8 _dispatch_queue_barrier_sync_invoke_and_complete + 56
7 Foo Bar 0x1028726b0 CLSExceptionRecord + 4567612
8 Foo Bar 0x1028721c0 CLSTerminateHandler() + 4566348
9 libc++abi.dylib 0x1800a754c std::__terminate(void (*)()) + 16
10 libc++abi.dylib 0x1800a75b8 std::terminate() + 60
11 libobjc.A.dylib 0x1800b876c _destroyAltHandlerList + 10
12 libdispatch.dylib 0x1807ed05c _dispatch_client_callout + 36
13 libdispatch.dylib 0x1807f46c8 _dispatch_block_invoke_direct$VARIANT$mp + 288
14 FrontBoardServices 0x1835499f4 __FBSSERIALQUEUE_IS_CALLING_OUT_TO_A_BLOCK__ + 36
15 FrontBoardServices 0x183549698 -[FBSSerialQueue _performNext] + 404
16 FrontBoardServices 0x183549c34 -[FBSSerialQueue _performNextFromRunLoopSource] + 56
17 CoreFoundation 0x180e122e8 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 24
18 CoreFoundation 0x180e12268 __CFRunLoopDoSource0 + 88
19 CoreFoundation 0x180e11af0 __CFRunLoopDoSources0 + 204
20 CoreFoundation 0x180e0f6c8 __CFRunLoopRun + 1048
21 CoreFoundation 0x180d2ffb8 CFRunLoopRunSpecific + 436
22 GraphicsServices 0x182bc7f84 GSEventRunModal + 100
23 UIKit 0x18a3042f4 UIApplicationMain + 208
24 Foo Bar 0x1021c916c main (main.m:6)
25 libdyld.dylib 0x18085256c start + 4
--
Fatal Exception: std::out_of_range: map::at: key not found