According to Powershell "about quoting rules":
A here-string is a single-quoted or double-quoted string in which quotation marks are interpreted literally.
However the following here-string results in a TerminatorExpectedAtEndOfString exception in Powershell version 5.0 (build 10586, revision 117). In a Powershell version 2.0 it works as expected:
$herestr=@" '"' "@ Write-Host $herestr
If I quote the last single quote with a backtick (`) the here-string works as expected in both version 2.0 and 5.0.
$herestr=@" '"`' "@ Write-Host $herestr
Why do I need to escape the last single quote in a here-string?