fix corner case in unused (#4145)

fixes #4144
2020-09-22 07:03:27 +01:00
parent 3cca0d6249
commit 6d4c0fa6fa
2 changed files with 21 additions and 1 deletions
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -6474,7 +6474,7 @@ merge(Compressor.prototype, {
                    side_effects.push(node);
                    args[pos++] = make_sequence(call, side_effects);
                    side_effects = [];
-                } else if (!trim) {
+                } else if (!trim && fn.argnames[i].__unused) {
                    if (side_effects.length) {
                        node = make_sequence(call, side_effects);
                        side_effects = [];