From 051e32cb96c0ab992a0c49f355aaedb51343f5ca Mon Sep 17 00:00:00 2001
From: Eric Traut <erictr@microsoft.com>
Date: Thu, 18 Jul 2019 22:52:56 -0700
Subject: [PATCH] Expressions in "del" statements should be marked as accessed.

---
 server/src/analyzer/typeAnalyzer.ts | 1 +
 1 file changed, 1 insertion(+)

diff --git a/server/src/analyzer/typeAnalyzer.ts b/server/src/analyzer/typeAnalyzer.ts
index 63c0a4e3e70..31d83fd8c6b 100644
--- a/server/src/analyzer/typeAnalyzer.ts
+++ b/server/src/analyzer/typeAnalyzer.ts
@@ -1139,6 +1139,7 @@ export class TypeAnalyzer extends ParseTreeWalker {
 
     visitDel(node: DelNode) {
         node.expressions.forEach(expr => {
+            this._markExpressionAccessed(expr);
             this._evaluateExpressionForDeletion(expr);
 
             if (expr instanceof NameNode) {