closes #123892 by adding errors=replace when encoding unicode strings

1      * #123285: apply pragmas for warnings attached to lines to physical source
2        code lines
3 
4      * #123259: do not emit E0105 for yield expressions inside lambdas
5 
6 +    * #123892: don't crash when attempting to show source code line that can't
7 +      be encoded with the current locale settings
8 +
9      * Simplify checks for dangerous default values by unifying tests for all
10        different mutable compound literals.
11 
12      * Improve the description for E1124[redundant-keyword-arg]
13 

14              if not isinstance(string, unicode):
15                  return string
16              encoding = (getattr(self.out, 'encoding', None) or
17                          locale.getdefaultlocale()[1] or
18                          sys.getdefaultencoding())
19 -            return string.encode(encoding)
20 +            # errors=replace, we don't want to crash when attempting to show
21 +            # source code line that can't be encoded with the current locale
22 +            # settings
23 +            return string.encode(encoding, 'replace')
24          self.encode = encode
25 
26      def writeln(self, string=''):
27          """write a line in the output buffer"""
28          print >> self.out, self.encode(string)