it's safe to negate expression in !EXP only in boolean context

#kendo

diff --git a/lib/compress.js b/lib/compress.js
index 04fb785..5ceef20 100644 (file)
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -1446,9 +1446,9 @@ merge(Compressor.prototype, {
                 compressor.warn("Boolean expression always true [{file}:{line},{col}]", self.start);
                 return make_node(AST_True, self);
             }
-        }
-        if (e instanceof AST_Binary && self.operator == "!") {
-            self = best_of(self, e.negate(compressor));
+            if (e instanceof AST_Binary && self.operator == "!") {
+                self = best_of(self, e.negate(compressor));
+            }
         }
         return self.evaluate(compressor)[0];
     });