fix corner cases in `merge_vars` & with `exports` (#4762)

fixes #4761

2 files changed, 27 insertions, 0 deletions

diff --git a/test/compress/exports.js b/test/compress/exports.js
index 3aaae4ae..33059bca 100644
--- a/test/compress/exports.js
+++ b/test/compress/exports.js
@@ -457,3 +457,10 @@ issue_4742_unused_2: {
         a = "bar";
     }
 }
+
+issue_4761: {
+    input: {
+        export default "function" == 42;
+    }
+    expect_exact: 'export default"function"==42;'
+}
diff --git a/test/compress/merge_vars.js b/test/compress/merge_vars.js
index a26c0dd8..0494acfb 100644
--- a/test/compress/merge_vars.js
+++ b/test/compress/merge_vars.js
@@ -3281,3 +3281,23 @@ issue_4759: {
     }
     expect_stdout: "undefined"
 }
+
+issue_4761: {
+    options = {
+        merge_vars: true,
+        toplevel: true,
+    }
+    input: {
+        var a = "FAIL", b;
+        try {
+            !a && --a && (b = 0)[console] || console.log(b);
+        } catch (e) {}
+    }
+    expect: {
+        var a = "FAIL", b;
+        try {
+            !a && --a && (b = 0)[console] || console.log(b);
+        } catch (e) {}
+    }
+    expect_stdout: "undefined"
+}