I was able to reproduce a crash, not sure if it was the crash. This is happening on the macOS desktop embedder when running in debug mode

flutter run
Building macOS application...                                           
../../third_party/dart/runtime/vm/object.cc: 3716: error: Unable to use class Library:'dart:ui' Class: TextRange which is not loaded yet.
version=2.7.0 (Wed Nov 6 22:44:33 2019 +0000) on "macos_x64"
thread=39179, isolate=main(0x7ff0528b1000)
  pc 0x000000010b818155 fp 0x00007000036f6350 dart::Profiler::DumpStackTrace(void*)
  pc 0x000000010b6b1a92 fp 0x00007000036f6430 dart::Assert::Fail(char const*, ...)
  pc 0x000000010b7a8c21 fp 0x00007000036f6460 dart::Class::EnsureDeclarationLoaded() const
  pc 0x000000010b6faafe fp 0x00007000036f64d0 dart::ClassFinalizer::FinalizeTypesInClass(dart::Class const&)
  pc 0x000000010b6fab6e fp 0x00007000036f6540 dart::ClassFinalizer::FinalizeTypesInClass(dart::Class const&)
  pc 0x000000010b6fa92e fp 0x00007000036f66c0 dart::ClassFinalizer::ProcessPendingClasses()
  pc 0x000000010bab78be fp 0x00007000036f66f0 dart::Api::CheckAndFinalizePendingClasses(dart::Thread*)
  pc 0x000000010bad24ce fp 0x00007000036f6830 Dart_FinalizeLoading
  pc 0x000000010b6a226e fp 0x00007000036f6870 flutter::DartIsolate::LoadKernel(std::__1::shared_ptr<fml::Mapping const>, bool)
  pc 0x000000010b6a2359 fp 0x00007000036f6920 flutter::DartIsolate::PrepareForRunningFromKernel(std::__1::shared_ptr<fml::Mapping const>, bool)
  pc 0x000000010b46b45e fp 0x00007000036f6960 flutter::KernelIsolateConfiguration::DoPrepareIsolate(flutter::DartIsolate&)
  pc 0x000000010b4643c8 fp 0x00007000036f6b40 flutter::Engine::PrepareAndLaunchIsolate(flutter::RunConfiguration)
  pc 0x000000010b463e93 fp 0x00007000036f6d60 flutter::Engine::Run(flutter::RunConfiguration)
  pc 0x000000010b4814cb fp 0x00007000036f6f00 std::__1::__function::__func<fml::internal::CopyableLambda<flutter::Shell::RunEngine(flutter::RunConfiguration, std::__1::function<void (flutter::Engine::RunStatus)>)::$_7>, std::__1::allocator<fml::internal::CopyableLambda<flutter::Shell::RunEngine(flutter::RunConfiguration, std::__1::function<void (flutter::Engine::RunStatus)>)::$_7> >, void ()>::operator()()
  pc 0x000000010b00a783 fp 0x00007000036f6f80 fml::MessageLoopImpl::FlushTasks(fml::FlushType)
  pc 0x000000010b01338c fp 0x00007000036f6fb0 fml::MessageLoopDarwin::OnTimerFire(__CFRunLoopTimer*, fml::MessageLoopDarwin*)
  pc 0x00007fff37d85060 fp 0x00007000036f6fc0 __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__
  pc 0x00007fff37d84c0c fp 0x00007000036f8070 __CFRunLoopDoTimer
  pc 0x00007fff37d84752 fp 0x00007000036f80d0 __CFRunLoopDoTimers
  pc 0x00007fff37d65962 fp 0x00007000036f8de0 __CFRunLoopRun
  pc 0x00007fff37d64ebe fp 0x00007000036f8e70 CFRunLoopRunSpecific
  pc 0x000000010b0135bd fp 0x00007000036f8eb0 fml::MessageLoopDarwin::Run()
  pc 0x000000010b00a624 fp 0x00007000036f8ed0 fml::MessageLoopImpl::DoRun()
  pc 0x000000010b0120f8 fp 0x00007000036f8f10 void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, fml::Thread::Thread(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&)::$_0> >(void*)
  pc 0x00007fff63ed12eb fp 0x00007000036f8f30 _pthread_body
  pc 0x00007fff63ed4249 fp 0x00007000036f8f50 _pthread_start
  pc 0x00007fff63ed040d fp 0x00007000036f8f78 thread_start

I noticed that TextRange doesn't have an entrypoint annotation (should it?), but I did not think this mattered in debug mode.

cc @a-siva @alexmarkov

Hot reload crashes the mac os desktop embedder #44724

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