fix is_number() on += (#1714)

fixes #1710
mishoo · Mar 28, 2017 · f71f490 · f71f490
1 parent fb177a6
commit f71f490
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Showing 2 changed files with 17 additions and 2 deletions.
diff --git a/lib/compress.js b/lib/compress.js
@@ -1167,9 +1167,9 @@ merge(Compressor.prototype, {
                 && this.left.is_number(compressor)
                 && this.right.is_number(compressor);
         });
-        var assign = makePredicate("-= *= /= %= &= |= ^= <<= >>= >>>=");
         def(AST_Assign, function(compressor){
-            return assign(this.operator) || this.right.is_number(compressor);
+            return binary(this.operator.slice(0, -1))
+                || this.operator == "=" && this.right.is_number(compressor);
         });
         def(AST_Seq, function(compressor){
             return this.cdr.is_number(compressor);

diff --git a/test/compress/numbers.js b/test/compress/numbers.js
@@ -153,3 +153,18 @@ evaluate_4: {
         );
     }
 }
+
+issue_1710: {
+    options = {
+        evaluate: true,
+    }
+    input: {
+        var x = {};
+        console.log((x += 1) + -x);
+    }
+    expect: {
+        var x = {};
+        console.log((x += 1) + -x);
+    }
+    expect_stdout: true
+}