Lib\lib2to3\tests\data\py2_test_grammar.py, in test_with_statement, requires a variant of the with statement (multiple targets) that is not available in Python 2.6.  Compiling py2_test_grammar.py raises a SyntaxError.  This makes the 2.6.5 installer exit with an error message when asked to pre-compile all .pyc files, as reported in issue6716.

The fix is simply to remove the last three 'with' statements in function test_with_statement, around line 923 in Lib\lib2to3\tests\data\py2_test_grammar.py, as this is invalid code for this Python version.