# HG changeset patch
# User Paul Boddie <paul@boddie.org.uk>
# Date 1481668194 -3600
# Node ID 18c564471d4a7df9674ac32ea5eba8aba5e0aaad
# Parent  9e1d8b186e5c7710895ba1e9b0b02f26b8c0f0b0
Support encoding to streams using the original encoding of Unicode objects if
no stream encoding is set.

diff -r 9e1d8b186e5c -r 18c564471d4a lib/__builtins__/file.py
--- a/lib/__builtins__/file.py	Tue Dec 13 23:28:09 2016 +0100
+++ b/lib/__builtins__/file.py	Tue Dec 13 23:29:54 2016 +0100
@@ -76,9 +76,10 @@
 
         check_string(s)
 
-        # Encode text as bytes if necessary.
+        # Encode text as bytes if necessary. When the encoding is not set, any
+        # original encoding of the text will be applied.
 
-        if self.encoding and _isinstance(s, utf8string):
+        if _isinstance(s, utf8string):
             s = s.encode(self.encoding)
 
         fwrite(self.__data__, s)