/usr/share/javascript/prettify/lang-go.js is in libjs-prettify 2013.03.04+dfsg-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 | PR.registerLangHandler(PR.createSimpleLexer([["pln",/^[\t\n\r \xA0]+/,null,"\t\n\r \u00a0"],["pln",/^(?:\"(?:[^\"\\]|\\[\s\S])*(?:\"|$)|\'(?:[^\'\\]|\\[\s\S])+(?:\'|$)|`[^`]*(?:`|$))/,null,"\"'"]],[["com",/^(?:\/\/[^\r\n]*|\/\*[\s\S]*?\*\/)/],["pln",/^(?:[^\/\"\'`]|\/(?![\/\*]))+/i]]),["go"]);
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