statement effect inspection adjusted for tuples (PY-3143)

python/src/com/jetbrains/python/inspections/PyStatementEffectInspection.java

@@ -128,6 +128,14 @@ public class PyStatementEffectInspection extends PyInspection {
           }
         }
       }
+      else if (expression instanceof PyTupleExpression) {
+        PyExpression[] elements = ((PyTupleExpression)expression).getElements();
+        for (PyExpression element : elements) {
+          if (hasEffect(element)) {
+            return true;
+          }
+        }
+      }
       return false;
     }
   }

python/testData/inspections/PyStatementEffectInspection/test.py

@@ -20,3 +20,5 @@ cout << "Hello, world" # must not be reported
 len(x) if True else len(y)
 
 (foo())
+
+foo(),