fix corner case in evaluate (#3559)

fixes #3558
2019-11-01 00:01:25 +08:00
parent 3797458365
commit 1e9b576ee9
2 changed files with 25 additions and 4 deletions
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -2862,10 +2862,10 @@ merge(Compressor.prototype, {
              case "+": return +v;
              case "++":
              case "--":
-                if (e instanceof AST_SymbolRef) {
-                    var refs = e.definition().references;
-                    if (refs[refs.length - 1] === e) return v;
-                }
+                if (!(e instanceof AST_SymbolRef)) return this;
+                var refs = e.definition().references;
+                if (refs[refs.length - 1] !== e) return this;
+                return HOP(e, "_eval") ? +(this.operator[0] + 1) + +v : v;
            }
            return this;
        });