HaloFour

using BenchmarkDotNet.Attributes;
using BenchmarkDotNet.Running;
using System;

namespace BenchmarkVTPattern
{
    [CoreJob]
    [MemoryDiagnoser]
    public class Benchmark
    {

HaloFour

/*
 * Copyright 2012 Comcast Cable Communications Management, LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software

HaloFour

using BenchmarkDotNet.Attributes;
using BenchmarkDotNet.Running;
using System;

/*
BenchmarkDotNet=v0.11.3, OS=Windows 10.0.17763.55 (1809/October2018Update/Redstone5)
Intel Xeon CPU E5405 2.00GHz, 1 CPU, 4 logical and 4 physical cores
.NET Core SDK=2.1.500
  [Host] : .NET Core 2.1.6 (CoreCLR 4.6.27019.06, CoreFX 4.6.27019.05), 64bit RyuJIT
  Core   : .NET Core 2.1.6 (CoreCLR 4.6.27019.06, CoreFX 4.6.27019.05), 64bit RyuJIT

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) {

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

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

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

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

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.Diagnostics;

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

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