include filename and line number in SyntaxError

Lib/test/test_syntax.py

@@ -5,7 +5,7 @@ Here's an example of the sort of thing that is tested.
 >>> def f(x):
 ...     global x
 Traceback (most recent call last):
-SyntaxError: name 'x' is local and global
+SyntaxError: name 'x' is local and global (<doctest test.test_syntax[0]>, line 1)
 
 The tests are all raise SyntaxErrors.  They were created by checking
 each C call that raises SyntaxError.  There are several modules that

Python/symtable.c

@@ -373,6 +373,9 @@ analyze_name(PySTEntryObject *ste, PyObject *dict, PyObject *name, long flags,
 			PyErr_Format(PyExc_SyntaxError,
 				     "name '%s' is local and global",
 				     PyString_AS_STRING(name));
+			PyErr_SyntaxLocation(ste->ste_table->st_filename,
+					     ste->ste_lineno);
+			
 			return 0;
 		}
 		SET_SCOPE(dict, name, GLOBAL_EXPLICIT);