fix corner case in `--reduce-test` (#3819)

1 files changed, 4 insertions, 1 deletions

diff --git a/bin/uglifyjs b/bin/uglifyjs
index 2b02df03..e5124b06 100755
--- a/bin/uglifyjs
+++ b/bin/uglifyjs
@@ -237,7 +237,10 @@ function run() {
         // load on demand - assumes dev tree checked out
         var reduce_test = require("../test/reduce");
         var testcase = files[0] || files[Object.keys(files)[0]];
-        var result = reduce_test(testcase, options, {verbose: true});
+        var result = reduce_test(testcase, options, {
+            log: print_error,
+            verbose: true,
+        });
     }
     else {
         var result = UglifyJS.minify(files, options);