* Now the source encoding declaration on the second line isn't effective if
the first line contains anything except a comment. This affects compile(),
eval() and exec() too.
* IDLE now ignores the source encoding declaration on the second line if the
first line contains anything except a comment.
* 2to3 and the findnocoding.py script now ignore the source encoding
declaration on the second line if the first line contains anything except
a comment.