/usr/share/javascript/prettify/lang-mumps.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 2 | PR.registerLangHandler(PR.createSimpleLexer([["pln",/^[\t\n\r \xA0]+/,null,"\t\n\r \u00a0"],["str",/^(?:"(?:[^"]|\\.)*")/,null,'"']],[["com",/^;[^\r\n]*/,null,";"],["dec",RegExp("^(?:\\$(?:D|DEVICE|EC|ECODE|ES|ESTACK|ET|ETRAP|H|HOROLOG|I|IO|J|JOB|K|KEY|P|PRINCIPAL|Q|QUIT|ST|STACK|S|STORAGE|SY|SYSTEM|T|TEST|TL|TLEVEL|TR|TRESTART|X|Y|Z[A-Z]*|A|ASCII|C|CHAR|D|DATA|E|EXTRACT|F|FIND|FN|FNUMBER|G|GET|J|JUSTIFY|L|LENGTH|NA|NAME|O|ORDER|P|PIECE|QL|QLENGTH|QS|QSUBSCRIPT|Q|QUERY|R|RANDOM|RE|REVERSE|S|SELECT|ST|STACK|T|TEXT|TR|TRANSLATE|NaN))\\b",
"i"),null],["kwd",RegExp("^(?:[^\\$]B|BREAK|C|CLOSE|D|DO|E|ELSE|F|FOR|G|GOTO|H|HALT|H|HANG|I|IF|J|JOB|K|KILL|L|LOCK|M|MERGE|N|NEW|O|OPEN|Q|QUIT|R|READ|S|SET|TC|TCOMMIT|TRE|TRESTART|TRO|TROLLBACK|TS|TSTART|U|USE|V|VIEW|W|WRITE|X|XECUTE)\\b","i"),null],["lit",/^[+-]?(?:(?:\.\d+|\d+(?:\.\d*)?)(?:E[+\-]?\d+)?)/i],["pln",/^[a-z][a-zA-Z0-9]*/i],["pun",/^[^\w\t\n\r\xA0\"\$;%\^]|_/]]),["mumps"]);
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