Function peg$c20

parser.js:174–177

(op, s)

          return [s].concat(ss.map(function (s) { return s[3]; }));
        },
        peg$c20 = function(op, s) {
            if (!op) return s;
            return { type: op, left: { type: 'exactNode' }, right: s };
          },
        peg$c21 = function(a, ops) {
            return ops.reduce(function (memo, rhs) {
              return { type: rhs[0], left: memo, right: rhs[1] };