fix corner case in dead_code (#4304)

2020-11-19 00:34:55 +00:00
parent db87dcf13e
commit 134ef0b1eb
3 changed files with 39 additions and 1 deletions
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -7027,7 +7027,8 @@ merge(Compressor.prototype, {
    OPT(AST_Try, function(self, compressor) {
        self.body = tighten_body(self.body, compressor);
        if (compressor.option("dead_code")) {
-            if (has_declarations_only(self)) {
+            if (has_declarations_only(self)
+                && !(self.bcatch && self.bcatch.argname && !can_drop_symbol(self.bcatch.argname))) {
                var body = [];
                if (self.bcatch) {
                    extract_declarations_from_unreachable_code(compressor, self.bcatch, body);