HaloFour

using System;
using System.Collections.Generic;
using System.Diagnostics;

public struct CompilerGeneratedArgs3 : IEnumerable<int>
{
    private struct Enumerator : IEnumerator<int>
    {
        private readonly CompilerGeneratedArgs3 args;
        private int index;

HaloFour

.assembly extern mscorlib {
  .publickeytoken = (B7 7A 5C 56 19 34 E0 89 )
  .ver 4:0:0:0
}
.assembly Covariance {
  .ver 1:0:0:0
}

.module Covariance.exe
.subsystem 0x0003

HaloFour

public static class SynchronizationContextExtensions {
    public struct SynchronizationContextAwaiter : INotifyCompletion {
        private readonly SynchronizationContext context;

        public SynchronizationContextAwaiter(SynchronizationContext context) {
            this.context = context;
        }

        public bool IsCompleted {
            get { return (context == null); }

HaloFour

using System;
using System.Diagnostics;

public struct ValueTuple<T1, T2> {
    public T1 Item1;
    public T2 Item2;

    public ValueTuple(T1 item1, T2 item2) {
        this.Item1 = item1;
        this.Item2 = item2;

HaloFour

using System;
using System.Collections.Generic;

/*
 * public data class LoginResource
 * {
 *     public string Username { get; }
 *     public string Password { get; } 
 *     public bool RememberMe { get; } = true;
 * }

HaloFour

using System;
using System.Collections.Generic;

/*
 * public data class LoginResource(string Username, string Password)
 * {
 *     public bool RememberMe { get; } = true;
 * }
 */
public sealed class LoginResource : IEquatable<LoginResource> {

HaloFour

public class LoginResource {
    public struct Builder {
        private byte _assigned;
        
        private string _username;
        private string _password;
        
        public string Username {
            get => _username;
            set {

HaloFour

1. What kind of problem are you trying to solve?
   • How often do you find yourself running into this problem?
2. Is this a problem that you can work around today with existing language features?
   • If so, can you write up a snippet? (link to GitHub code fencing documentation)
3. Can you describe the new language feature and how it addresses this problem?
4. Can you include some sample syntax for what this new language feature might look like?

• If possible, use comments or pseudocode to explain the behavior of the feature

HaloFour

package com.comcast.money.japi;

import com.comcast.money.core.Money$;
import com.comcast.money.core.Note;
import com.comcast.money.core.Result;
import com.comcast.money.core.StringNote;
import com.comcast.money.core.Tracer;

public class JMoneyTracer {
    private static Tracer tracer() {

HaloFour

public class JMoney {
    public static <T, S extends CompletionStage<T>, E extends Exception> S traceAsync(String spanName, CheckedCallable<S, E> callable) throws E {

        Tracer tracer = tracer();
        tracer.startSpan(spanName);

        S stage;
        try {
            stage = callable.call();
        } catch (Exception exception) {