Nothing more than a tidbit to remind myself:
This should spit out something like this in v3:(get-help about_Automatic_Variables) -split "`n" | where {$_ -match ^ $}
$$$?$^$_$Args$ConsoleFileName$Error$EventArgs$EventSubscriber$ExecutionContext$False$ForEach$Home$Host$Input$LastExitCode$Matches$MyInvocation$NestedPromptLevel$NULL$PID$Profile$PSBoundParameters$PsCmdlet$PSCommandPath$PsCulture$PSDebugContext$PsHome$PSScriptRoot$PSSenderInfo$PsUICulture$PsVersionTable$Pwd$ReportErrorShowExceptionClass$ReportErrorShowInnerException$ReportErrorShowSource$ReportErrorShowStackTrace$Sender$ShellID$StackTrace$This$True