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-rw-r--r--prolog/common.py3
1 files changed, 3 insertions, 0 deletions
diff --git a/prolog/common.py b/prolog/common.py
index 8e3d91d..e591e0b 100644
--- a/prolog/common.py
+++ b/prolog/common.py
@@ -1,4 +1,6 @@
import operator
+import socket
+
import prolog.engine
from prolog.util import tokenize
from server.hints import Hint, HintPopup
@@ -22,6 +24,7 @@ hint_type = {
# Check program for syntax errors.
def check_syntax(code, aux_code):
+ engine_id = None
try:
engine_id, output = prolog.engine.create(code=code+aux_code, timeout=1.0)
if 'error' in map(operator.itemgetter(0), output):