Remove unused assignment

IPython/core/inputtransformer2.py

@@ -631,7 +631,7 b' class TransformerManager:'
         try:
             with warnings.catch_warnings():
                 warnings.simplefilter('error', SyntaxWarning)
-                res = compile_command(''.join(lines), symbol='exec')
+                compile_command(''.join(lines), symbol='exec')
         except (SyntaxError, OverflowError, ValueError, TypeError,
                 MemoryError, SyntaxWarning):
             return 'invalid', None