fix corner case in `unsafe_math` (#3677)

fixes #3676

1 files changed, 32 insertions, 0 deletions

diff --git a/test/compress/numbers.js b/test/compress/numbers.js
index f49996a4..c40ca09d 100644
--- a/test/compress/numbers.js
+++ b/test/compress/numbers.js
@@ -1135,3 +1135,35 @@ issue_3655: {
         "0",
     ]
 }
+
+issue_3676_1: {
+    options = {
+        evaluate: true,
+        unsafe_math: true,
+    }
+    input: {
+        var a = [];
+        console.log(false - (a - (a[1] = 42)));
+    }
+    expect: {
+        var a = [];
+        console.log(false - (a - (a[1] = 42)));
+    }
+    expect_stdout: "NaN"
+}
+
+issue_3676_2: {
+    options = {
+        evaluate: true,
+        unsafe_math: true,
+    }
+    input: {
+        var a;
+        console.log(false - ((a = []) - (a[1] = 42)));
+    }
+    expect: {
+        var a;
+        console.log(false - ((a = []) - (a[1] = 42)));
+    }
+    expect_stdout: "NaN"
+}