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-rw-r--r--tools/js-optimizer.js2
1 files changed, 1 insertions, 1 deletions
diff --git a/tools/js-optimizer.js b/tools/js-optimizer.js
index ed9aa46d..8874dc88 100644
--- a/tools/js-optimizer.js
+++ b/tools/js-optimizer.js
@@ -895,7 +895,7 @@ var NO_SIDE_EFFECTS = set('num', 'name');
function hasSideEffects(node) { // this is 99% incomplete!
if (node[0] in NO_SIDE_EFFECTS) return false;
- if (node[0] == 'unary-prefix' && node[1] == '!') return hasSideEffects(node[2]);
+ if (node[0] == 'unary-prefix') return hasSideEffects(node[2]);
if (node[0] == 'binary') return hasSideEffects(node[2]) || hasSideEffects(node[3]);
return true;
}