From 29e24a4cbe0589f9c06ce8f41316a22c2e4ea3f1 Mon Sep 17 00:00:00 2001
From: Sebastian McKenzie <sebmck@gmail.com>
Date: Sat, 30 May 2015 19:07:58 -0400
Subject: [PATCH] don't evaluate non-referenced identifiers

---
 .../transformers/minification/inline-expressions.js           | 4 ----
 src/babel/traversal/path/evaluation.js                        | 2 +-
 2 files changed, 1 insertion(+), 5 deletions(-)

diff --git a/src/babel/transformation/transformers/minification/inline-expressions.js b/src/babel/transformation/transformers/minification/inline-expressions.js
index 06671a3db9..a208767889 100644
--- a/src/babel/transformation/transformers/minification/inline-expressions.js
+++ b/src/babel/transformation/transformers/minification/inline-expressions.js
@@ -11,7 +11,3 @@ export var Expression = {
     if (res.confident) return t.valueToNode(res.value);
   }
 };
-
-export function Identifier() {
-  // override Expression
-}
diff --git a/src/babel/traversal/path/evaluation.js b/src/babel/traversal/path/evaluation.js
index 3da68b2e26..fbdc2935c6 100644
--- a/src/babel/traversal/path/evaluation.js
+++ b/src/babel/traversal/path/evaluation.js
@@ -78,7 +78,7 @@ export function evaluate(): { confident: boolean; value: any } {
       return undefined;
     }
 
-    if (path.isIdentifier() || path.isMemberExpression()) {
+    if ((path.isIdentifier() || path.isMemberExpression()) && path.isReferenced()) {
       path = path.resolve();
       if (path) {
         return evaluate(path);