fix cascade of `evaluate` optimisation (#1654)

Operator has changed, so break out from rest of the rules.

fixes #1649

1 files changed, 2 insertions, 0 deletions

diff --git a/lib/compress.js b/lib/compress.js
index 3804a932..e13985ee 100644
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -3292,6 +3292,7 @@ merge(Compressor.prototype, {
                         left: self.left,
                         right: self.right.expression
                     });
+                    break;
                 }
                 // -a + b => b - a
                 if (self.left instanceof AST_UnaryPrefix
@@ -3303,6 +3304,7 @@ merge(Compressor.prototype, {
                         left: self.right,
                         right: self.left.expression
                     });
+                    break;
                 }
               case "*":
                 associative = compressor.option("unsafe_math");