/usr/lib/nodejs/acorn/loose/parseutil.js is in node-acorn 5.4.1+ds1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | "use strict";
exports.isDummy = isDummy;
function isDummy(node) { return node.name == "✖" }
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