fix corner case in `collapse_vars` (#4946)

2 files changed, 35 insertions, 1 deletions

diff --git a/test/compress/collapse_vars.js b/test/compress/collapse_vars.js
index 83eccdf1..d2f27299 100644
--- a/test/compress/collapse_vars.js
+++ b/test/compress/collapse_vars.js
@@ -9245,3 +9245,37 @@ issue_4935: {
     }
     expect_stdout: "1 0"
 }
+
+inline_throw: {
+    options = {
+        collapse_vars: true,
+        inline: true,
+        keep_fargs: false,
+        unused: true,
+    }
+    input: {
+        try {
+            (function() {
+                return function(a) {
+                    return function(b) {
+                        throw b;
+                    }(a);
+                };
+            })()("PASS");
+        } catch (e) {
+            console.log(e);
+        }
+    }
+    expect: {
+        try {
+            (function(a) {
+                return function() {
+                    throw a;
+                }();
+            })("PASS");
+        } catch (e) {
+            console.log(e);
+        }
+    }
+    expect_stdout: "PASS"
+}
diff --git a/test/reduce.js b/test/reduce.js
index 3f154fa7..15f869e5 100644
--- a/test/reduce.js
+++ b/test/reduce.js
@@ -46,7 +46,7 @@ module.exports = function reduce_test(testcase, minify_options, reduce_options)
     if (verbose) {
         log("// Node.js " + process.version + " on " + os.platform() + " " + os.arch());
     }
-    if (differs.error && [ "DefaultsError", "SyntaxError" ].indexOf(differs.error.name) < 0) {
+    if (differs && differs.error && [ "DefaultsError", "SyntaxError" ].indexOf(differs.error.name) < 0) {
         test_for_diff = test_minify;
         differs = test_for_diff(testcase, minify_options, result_cache, max_timeout);
     }