fix corner case in merge_vars (#4104)

fixes #4103
2020-09-15 12:47:12 +01:00
parent d64d0b0bec
commit 335456cf77
2 changed files with 29 additions and 1 deletions
--- a/test/compress/merge_vars.js
+++ b/test/compress/merge_vars.js
@@ -260,3 +260,30 @@ read_before_assign_2: {
    }
    expect_stdout: "PASS"
 }
+
+issue_4103: {
+    options = {
+        merge_vars: true,
+        side_effects: true,
+        toplevel: true,
+    }
+    input: {
+        function f(a) {
+            console.log(a);
+        }
+        var b = 0;
+        var c = f(b++ + (c %= 1 >> console.log(c = 0)));
+        b;
+    }
+    expect: {
+        function f(a) {
+            console.log(a);
+        }
+        var b = 0;
+        var c = f(b++ + (c %= 1 >> console.log(c = 0)));
+    }
+    expect_stdout: [
+        "0",
+        "NaN",
+    ]
+}