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SpecialForms["const"] = (args, env) => { if (args[0].type !== "word") { throw new SyntaxError("Bad number of arguments"); } const value = SpecialForms["define"](args, env); // Variable name const name = args[0].name; // Add const attribute to the symbol table env["__symbol__"].addAttribute("const", true, name); return value; }; SpecialForms["define_wrapped"] = SpecialForms["define"]; SpecialForms["def"] = SpecialForms["define"] = SpecialForms[":="] = (args, env) => { if (args.length !== 2 || args[0].type !== "word") { throw new SyntaxError("Bad use of define"); } // Variable name let valName = args[0].name; if (env["__symbol__"].checkAttribute("const", valName)) { throw new ReferenceError(`Trying to change 'const' variable ${args[0].name}`); } return SpecialForms["define_wrapped"](args, env); }; [Number, String, Boolean].forEach(type => { TopEnv[String(type.name).toLowerCase()] = x => { return type(x); }; }); </code></pre> </div> <footer class="footer"> Generated by <a href="https://esdoc.org">ESDoc(1.1.0)<img src="./image/esdoc-logo-mini-black.png"></a> </footer> <script src="script/search_index.js"></script> <script src="script/search.js"></script> <script src="script/pretty-print.js"></script> <script src="script/inherited-summary.js"></script> <script src="script/test-summary.js"></script> <script src="script/inner-link.js"></script> <script src="script/patch-for-local.js"></script> </body> </html>