From 5561d3e7f3252837ac3b85401f2403937860da46 Mon Sep 17 00:00:00 2001
From: "Alex Lam S.L" <alexlamsl@gmail.com>
Date: Mon, 8 Jun 2020 17:09:21 +0100
Subject: fix corner case in `collapse_vars` (#3972)

fixes #3971
---
 test/compress/collapse_vars.js | 55 +++++++++++++++++++++++++++++++++++++++---
 1 file changed, 51 insertions(+), 4 deletions(-)

(limited to 'test/compress')

diff --git a/test/compress/collapse_vars.js b/test/compress/collapse_vars.js
index f99e0124..71c3a147 100644
--- a/test/compress/collapse_vars.js
+++ b/test/compress/collapse_vars.js
@@ -7977,7 +7977,7 @@ mangleable_var: {
     expect_stdout: "PASS"
 }
 
-issue_3884: {
+issue_3884_1: {
     options = {
         collapse_vars: true,
         evaluate: true,
@@ -7995,9 +7995,33 @@ issue_3884: {
         console.log(a, b);
     }
     expect: {
-        var a = 100;
-        ++a;
-        console.log(a, 32);
+        var a = 100, b = 1;
+        b <<= ++a;
+        console.log(a, b);
+    }
+    expect_stdout: "101 32"
+}
+
+issue_3884_2: {
+    options = {
+        collapse_vars: true,
+        evaluate: true,
+        passes: 3,
+        reduce_vars: true,
+        side_effects: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        var a = 100, b = 1;
+        {
+            a++ + a || a;
+            b <<= a;
+        }
+        console.log(a, b);
+    }
+    expect: {
+        console.log(101, 32);
     }
     expect_stdout: "101 32"
 }
@@ -8195,3 +8219,26 @@ operator_in: {
     }
     expect_stdout: "PASS"
 }
+
+issue_3971: {
+    options = {
+        collapse_vars: true,
+        evaluate: true,
+        reduce_vars: true,
+        side_effects: true,
+        toplevel: true,
+    }
+    input: {
+        var a = 0 == typeof f, b = 0;
+        {
+            var a = void (a++ + (b |= a));
+        }
+        console.log(b);
+    }
+    expect: {
+        var a = 0 == typeof f, b = 0;
+        var a = void (b |= ++a);
+        console.log(b);
+    }
+    expect_stdout: "1"
+}
-- 
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