Index: lib/Fuzzer/FuzzerDriver.cpp
===================================================================
--- lib/Fuzzer/FuzzerDriver.cpp
+++ lib/Fuzzer/FuzzerDriver.cpp
@@ -277,6 +277,7 @@
       return 1;
   if (Flags.verbosity > 0 && !Options.Dictionary.empty())
     Printf("Dictionary: %zd entries\n", Options.Dictionary.size());
+  Options.WriteCrash = !Flags.test_single_input;
 
   Fuzzer F(USF, Options);
 
Index: lib/Fuzzer/FuzzerInternal.h
===================================================================
--- lib/Fuzzer/FuzzerInternal.h
+++ lib/Fuzzer/FuzzerInternal.h
@@ -93,6 +93,7 @@
     std::string ArtifactPrefix = "./";
     std::vector<std::string> Tokens;
     std::vector<Unit> Dictionary;
+    bool WriteCrash = true;
   };
   Fuzzer(UserSuppliedFuzzer &USF, FuzzingOptions Options);
   void AddToCorpus(const Unit &U) { Corpus.push_back(U); }
Index: lib/Fuzzer/FuzzerLoop.cpp
===================================================================
--- lib/Fuzzer/FuzzerLoop.cpp
+++ lib/Fuzzer/FuzzerLoop.cpp
@@ -52,7 +52,8 @@
     Print(CurrentUnit, "\n");
     PrintUnitInASCIIOrTokens(CurrentUnit, "\n");
   }
-  WriteUnitToFileWithPrefix(CurrentUnit, "crash-");
+  if (Options.WriteCrash)
+    WriteUnitToFileWithPrefix(CurrentUnit, "crash-");
 }
 
 void Fuzzer::StaticAlarmCallback() {
Index: lib/Fuzzer/test/fuzzer.test
===================================================================
--- lib/Fuzzer/test/fuzzer.test
+++ lib/Fuzzer/test/fuzzer.test
@@ -1,7 +1,8 @@
 CHECK: BINGO
 
 RUN: LLVMFuzzer-SimpleTest 2>&1 | FileCheck %s
-RUN: LLVMFuzzer-SimpleTest -test_single_input=%S/hi.txt 2>&1 | FileCheck %s 
+RUN: not LLVMFuzzer-NullDerefTest -test_single_input=%S/hi.txt 2>&1 | FileCheck %s --check-prefix=SingleInput
+SingleInput-NOT: Test unit written to ./crash-
 
 RUN: not LLVMFuzzer-InfiniteTest -timeout=2 2>&1 | FileCheck %s --check-prefix=InfiniteTest
 InfiniteTest: ALARM: working on the last Unit for