From 3c609e2f4a925b3c47bfa2b9185a353295f353b3 Mon Sep 17 00:00:00 2001
From: "Alex Lam S.L" <alexlamsl@gmail.com>
Date: Sat, 19 Sep 2020 18:45:52 +0100
Subject: enhance `unused` (#4129)

---
 lib/compress.js | 7 +++++++
 1 file changed, 7 insertions(+)

(limited to 'lib/compress.js')

diff --git a/lib/compress.js b/lib/compress.js
index 0f9fa6b2..3059c932 100644
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -4747,6 +4747,13 @@ merge(Compressor.prototype, {
                             }));
                         }
                     }
+                } else if (node instanceof AST_UnaryPostfix
+                    && node.expression instanceof AST_SymbolRef
+                    && indexOf_assign(node.expression.definition(), node) < 0) {
+                    return make_node(AST_UnaryPrefix, node, {
+                        operator: "+",
+                        expression: node.expression
+                    });
                 }
             }
             if (node instanceof AST_Call) calls_to_drop_args.push(node);
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