Function tryParse

test/fixtures/snapshot/typescript.js:32081–32083

Invokes the provided callback. If the callback returns something falsy, then it restores * the parser to the state it was in immediately prior to invoking the callback. If the * callback returns something truthy, then the parser state is not rolled back. The result * of

(callback)

         * of invoking the callback is returned from this function.
         */
        function tryParse(callback) {
            return speculationHelper(callback, 0 /* SpeculationKind.TryParse */);
        }
        function isBindingIdentifier() {
            if (token() === 79 /* SyntaxKind.Identifier */) {
                return true;