Finally clause can be canceled with CTRL + C

Steps to reproduce

try { } finally {
    Write-Host Press ctrl c now
    Start-Sleep 5
    Write-Host You`'ll never see this one
}

Evaluate the above script and press <kbd>CTRL</kbd> + <kbd>C</kbd> after the message is displayed.

Expected behavior

The entire finally block to complete.

Actual behavior

The finally block is cancelled when <kbd>CTRL</kbd> + <kbd>C</kbd> is pressed.

Environment data

Name                           Value
----                           -----
PSVersion                      7.0.0-preview.3
PSEdition                      Core
GitCommitId                    7.0.0-preview.3
OS                             Microsoft Windows 10.0.18362
Platform                       Win32NT
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0…}
PSRemotingProtocolVersion      2.3
SerializationVersion           1.1.0.1
WSManStackVersion              3.0

This also occurs on Windows PowerShell 5.1

Notes

If <kbd>CTRL</kbd> + <kbd>C</kbd> is pressed in the try block, additional key presses in the finally block will be correctly ignored. e.g.

try {
    Write-Host Press ctrl c now
    Start-Sleep 5
} finally {
    Write-Host Try pressing it a bunch, won`'t do anything
    Start-Sleep 5
    Write-Host You`'ll actually see this one
}

[vexx32]

From a user perspective, that might make sense.

From a module author’s perspective, that stance could be really dangerous. Sure, it might be what the user wants, but usually the things you put in a finally block are pretty important. Cancelling a finally block can lead to corrupted data, memory leaks (objects can’t be disposed properly), among a host of other problems.

This should be fixed.

[vexx32]

@SteveL-MSFT @daxian-dbw this is… fairly serious, no? Being able to cancel a finally block seems super not a good thing. 😦