fix corner case in hoist_vars (#4518)

fixes #4517
2021-01-07 07:05:48 +00:00
parent c3d358a5b8
commit cf1b0165af
2 changed files with 34 additions and 2 deletions
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -7700,6 +7700,7 @@ merge(Compressor.prototype, {
                def.references.push(name);
            }
            def.eliminated++;
+            def.single_use = false;
            return a;
        }, []);
        if (assignments.length == 0) return null;
@@ -9702,7 +9703,8 @@ merge(Compressor.prototype, {
                        }
                    }));
                } else {
-                    value = fixed.optimize(compressor).transform(new TreeTransformer(function(node, descend) {
+                    value = fixed.optimize(compressor);
+                    if (value === fixed) value = value.transform(new TreeTransformer(function(node, descend) {
                        if (node instanceof AST_Scope) return node;
                        node = node.clone();
                        descend(node, this);