Increase the chance of printing a useful error when bootstrapping fails

src/isolate.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <stdlib.h>
 
 #include <fstream>  // NOLINT(readability/streams)
 #include <sstream>
 
 #include "src/v8.h"
@@ skipping 919 matching lines @@
     base::OS::PrintError(
         "Extension or internal compilation error: %s in %s at line %d.\n",
         String::cast(*exception)->ToCString().get(),
         String::cast(location->script()->name())->ToCString().get(),
         line_number);
   } else if (location->script()->name()->IsString()) {
     base::OS::PrintError(
         "Extension or internal compilation error in %s at line %d.\n",
         String::cast(location->script()->name())->ToCString().get(),
         line_number);
+  } else if (exception->IsString()) {
+    base::OS::PrintError("Extension or internal compilation error: %s.\n",
+                         String::cast(*exception)->ToCString().get());
   } else {
     base::OS::PrintError("Extension or internal compilation error.\n");
   }
 #ifdef OBJECT_PRINT
   // Since comments and empty lines have been stripped from the source of
   // builtins, print the actual source here so that line numbers match.
   if (location->script()->source()->IsString()) {
     Handle<String> src(String::cast(location->script()->source()));
     PrintF("Failing script:\n");
     int len = src->length();
@@ skipping 1841 matching lines @@
   // Then check whether this scope intercepts.
   if ((flag & intercept_mask_)) {
     intercepted_flags_ |= flag;
     return true;
   }
   return false;
 }
 
 }  // namespace internal
 }  // namespace v8