powershell ForEach Reduce Syntax not interpreted as usage

[modellking]

What steps will reproduce the issue?

(1..3) | ForEach-Object {
    $Hashes = ""
} {
    $Hashes += "Some-String "
} {
    $Hashes
}

What is the expected result?

No Issue being detected. $Hashes is read and modified in the loop and is being passed on due to the third bracket. (Yes this is apparently not documented)

What happens instead?

line 2 $Hashes gets marked with "The variable Hashes is assigned but never used."

[ForNeVeR]

This is not a plugin issue but an issue of PSScriptAnalyzer, the analyzer issue we use.

I have reported it upstream: PowerShell/PSScriptAnalyzer#1942.