What's new in C# 10 and 11

```csharp
/*   _  __    ___                     _        ____ ____  _                          __ __     __            _                 _  ___                 _ _  __ __
    (_)/ _|  / / | __ _ _ __   __ _  (_)___   / ___/ ___|| |__   __ _ _ __ _ __     / / \ \   / /__ _ __ ___(_) ___  _ __  _  / |/ _ \    ___  _ __  / / | \ \\ \
    | | |_  | || |/ _` | '_ \ / _` | | / __| | |   \___ \| '_ \ / _` | '__| '_ \   | |   \ \ / / _ \ '__/ __| |/ _ \| '_ \(_) | | | | |  / _ \| '__| | | |  | || |
    | |  _| | || | (_| | | | | (_| | | \__ \ | |___ ___) | | | | (_| | |  | |_) | < <     \ V /  __/ |  \__ \ | (_) | | | |_  | | |_| | | (_) | |    | | |   > > |
    |_|_|   | ||_|\__,_|_| |_|\__, | |_|___/  \____|____/|_| |_|\__,_|_|  | .__/   | |     \_/ \___|_|  |___/_|\___/|_| |_(_) |_|\___/   \___/|_|    |_|_|  | || |
             \_\              |___/                                       |_|       \_\                                                                    /_//_/
             ____                      _    __        __    _ _       _     _             ___ ___        ___           _   _       _   _               ___ _ ___
            / ___|___  _ __  ___  ___ | | __\ \      / / __(_) |_ ___| |   (_)_ __   ___ / ( | ) \      / / |__   __ _| |_( )___  | \ | | _____      _|__ ( | ) \
           | |   / _ \| '_ \/ __|/ _ \| |/ _ \ \ /\ / / '__| | __/ _ \ |   | | '_ \ / _ \ | V V \ \ /\ / /| '_ \ / _` | __|// __| |  \| |/ _ \ \ /\ / / / /V V | |
           | |__| (_) | | | \__ \ (_) | |  __/\ V  V /| |  | | ||  __/ |___| | | | |  __/ |      \ V  V / | | | | (_| | |_  \__ \ | |\  |  __/\ V  V / |_|     | |
            \____\___/|_| |_|___/\___/|_|\___(_)_/\_/ |_|  |_|\__\___|_____|_|_| |_|\___| |       \_/\_/  |_| |_|\__,_|\__| |___/ |_| \_|\___| \_/\_/  (_)     | |
                                                                                         \_\                                                                  /_/
*/

// 10.1. Extended Property Pattern
// 10.2. Record Structs
// 10.3. Constant Interpolated Strings
// 10.4.a. Lambda Improvements - Inferred Types
// 10.4.b. Lambda Improvements - Return Types
// 10.4.c. Lambda Improvements - Attributes
// 10.5. Interpolated String Handler
// 10.6. Parameterless Struct Constructors
// 10.7. Caller Expression Attributes

// 11.1. Extended `nameof` Scope
// 11.2. Newlines in String Interpolation Expressions
// 11.3. Raw String Literals
// 11.4. UTF-8 Literals
// 11.5. Pattern Matching on Span<char>
// 11.6. List Patterns
// 11.7. Improve Method Group Conversion to Delegate
// 11.8. Numeric IntPtr and UIntPtr
// 11.9. Required Members
// 11.10. Auto-Default Struct
// 11.11. File-Scoped Types
// 11.12. Generic Attributes
// 11.13. Unsigned Right Shift
// 11.14. Relaxed Shift Operator Requirements
// 11.15. Checked User-Defined Operators
// 11.16. Static Abstract Interfaces (Generic Math)

// Next.1. Semi-Auto-Properties (`field`)
// Next.2. Attributes on Main for Top-Level Programs
// Next.3. Primary Constructors
// Next.4. `params Span<T>`
// Next.5. `nameof` Accessing Instance Members
// Next.6. Lambda Default Parameters
// Next 7. Allow `default` in Deconstruction

Console.WriteLine("Hello, C# 10 and 11.");

record Person(string Name, int Age, Address Address);
record Address(string City);

[AttributeUsage(AttributeTargets.Method)]
class MyAttribute : Attribute
{
}
```