Remove unused sys import from generate-deriving-span-tests

Author: KamilaBorowska

src/etc/generate-deriving-span-tests.py

@@ -18,7 +18,7 @@
 sample usage: src/etc/generate-deriving-span-tests.py
 """
 
-import sys, os, datetime, stat, re
+import os, datetime, stat, re
 
 TEST_DIR = os.path.abspath(
     os.path.join(os.path.dirname(__file__), '../test/compile-fail'))