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
8pt;">$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