dart:io | Make FileStat.stat throw an exception when the file does not exist, or cannot be accessed.

runtime/bin/file_macos.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "platform/globals.h"
 #if defined(TARGET_OS_MACOS)
 
 #include "bin/file.h"
 
 #include <errno.h>  // NOLINT
@@ skipping 205 matching lines @@
     } else {
       data[kType] = kDoesNotExist;
     }
     data[kCreatedTime] = st.st_ctime;
     data[kModifiedTime] = st.st_mtime;
     data[kAccessedTime] = st.st_atime;
     data[kMode] = st.st_mode;
     data[kSize] = st.st_size;
   } else {
     data[kType] = kDoesNotExist;
-    data[kCreatedTime] = 0;
-    data[kModifiedTime] = 0;
-    data[kAccessedTime] = 0;
-    data[kMode] = 0;
-    data[kSize] = 0;
   }
 }
 
 
 time_t File::LastModified(const char* name) {
   struct stat st;
   if (TEMP_FAILURE_RETRY(stat(name, &st)) == 0) {
     return st.st_mtime;
   }
   return -1;
@@ skipping 93 matching lines @@
   return (file_1_info.st_ino == file_2_info.st_ino &&
           file_1_info.st_dev == file_2_info.st_dev) ?
       File::kIdentical :
       File::kDifferent;
 }
 
 }  // namespace bin
 }  // namespace dart
 
 #endif  // defined(TARGET_OS_MACOS)