fix corner case in side_effects (#3514)

fixes #3512
2019-10-23 01:04:00 +08:00
parent 02308a7b56
commit a53ab99378
2 changed files with 31 additions and 1 deletions
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -4196,7 +4196,7 @@ merge(Compressor.prototype, {
            var left = this.left;
            if (left instanceof AST_PropAccess) {
                var expr = left.expression;
-                if (expr instanceof AST_Assign && !expr.may_throw_on_access(compressor)) {
+                if (expr instanceof AST_Assign && expr.operator == "=" && !expr.may_throw_on_access(compressor)) {
                    expr.write_only = "p";
                }
                if (compressor.has_directive("use strict") && expr.is_constant()) return this;