Fixes Issue #15798 - subprocess.Popen() no longer fails if file

descriptor 0, 1 or 2 is closed.

diff --cc Lib/subprocess.py
Simple merge

diff --cc Lib/test/test_subprocess.py
Simple merge

diff --cc Misc/NEWS
index 7bfce3ff77cc8d2fdcba48ff97446b9d5bebf4aa,4742b9b1c70ca38ebf13c4c1e8286a7070d6d267..7308f893e23a6abe64e96b76a7232030d197e2a8
--- 1/Misc/NEWS
--- 2/Misc/NEWS
+++ b/Misc/NEWS
@@@ -18,12 -18,9 +18,15 @@@ Core and Builtin
  Library
  -------
  
+ - Issue #15798: Fixed subprocess.Popen() to no longer fail if file
+   descriptor 0, 1 or 2 is closed.
+ 
 +- Issue #17897: Optimized unpickle prefetching.
 +
 +- Issue #3693: Make the error message more helpful when the array.array()
 +  constructor is given a str. Move the array module typecode documentation to
 +  the docstring of the constructor.
 +
  - Issue #19088: Fixed incorrect caching of the copyreg module in
    object.__reduce__() and object.__reduce_ex__().
  

diff --cc Modules/_posixsubprocess.c
Simple merge