Merge pull request #510 from simon-engledew/patch-1

Add an example query for catching cases where defer is used in a loop.

ql/examples/snippets/deferinloop.ql

@@ -0,0 +1,14 @@
+/**
+ * @name Defer in loop
+ * @description A deferred statement in a loop will not execute until the end of the function.
+ *              This can lead to unintentionally holding resources open like file handles or database transactions.
+ * @id go/examples/deferinloop
+ * @tags defer
+ *       nesting
+ */
+
+import go
+
+from LoopStmt loop, DeferStmt defer
+where loop.getBody().getAChildStmt+() = defer
+select defer, "This defer statement is in a $@.", loop, "loop"