const P = require("parsimmon");
const both = (parser1, parser2) => P.lookahead(parser1).then(parser2);
const p1 = P.string("q").many();
const p2 = P.fail("p2");
const p3 = both(p1, p2);
const s = "q";
p1.parse(s)
p2.parse(s)
p3.parse(s)
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