public override Maybe<Result> VisitAnd_expr(QueryParser.And_exprContext context) =>
context.not_expr().Select(Visit).Aggregate((a, b) => a.Zip(b).Bind(tuple =>
tuple.Item1
.And(tuple.Item2)
.Just()));
/// <summary>
/// Visit a parse tree produced by <see cref="QueryParser.and_expr"/>.
/// <para>
/// The default implementation returns the result of calling <see cref="AbstractParseTreeVisitor{Result}.VisitChildren(IRuleNode)"/>
/// on <paramref name="context"/>.
/// </para>
/// </summary>
/// <param name="context">The parse tree.</param>
/// <return>The visitor result.</return>
public virtual Result VisitAnd_expr([NotNull] QueryParser.And_exprContext context)
{
return(VisitChildren(context));
}
