improve switch case compression (#2547)

2 files changed, 29 insertions, 2 deletions

diff --git a/test/compress/issue-1750.js b/test/compress/issue-1750.js
index d18bc49f..970cea12 100644
--- a/test/compress/issue-1750.js
+++ b/test/compress/issue-1750.js
@@ -7,7 +7,7 @@ case_1: {
     input: {
         var a = 0, b = 1;
         switch (true) {
-          case a, true:
+          case a || true:
           default:
             b = 2;
           case true:
@@ -17,7 +17,7 @@ case_1: {
     expect: {
         var a = 0, b = 1;
         switch (true) {
-          case a, true:
+          case a || true:
             b = 2;
         }
         console.log(a, b);
diff --git a/test/compress/switch.js b/test/compress/switch.js
index b763d741..fbb86eda 100644
--- a/test/compress/switch.js
+++ b/test/compress/switch.js
@@ -833,7 +833,34 @@ issue_2535: {
     }
     expect: {
         w(), 42;
+        42;
         y();
         z();
     }
 }
+
+issue_1750: {
+    options = {
+        dead_code: true,
+        evaluate: true,
+        switches: true,
+    }
+    input: {
+        var a = 0, b = 1;
+        switch (true) {
+          case a, true:
+          default:
+            b = 2;
+          case true:
+        }
+        console.log(a, b);
+    }
+    expect: {
+        var a = 0, b = 1;
+        true;
+        a, true;
+        b = 2;
+        console.log(a, b);
+    }
+    expect_stdout: "0 2"
+}