A malformed type literal passed to the -is or -as operator is quietly ignored at the prompt #11428
Description
Note that the problem only surfaces at the interactive prompt, whether or not PSReadLine is loaded.
In a script / script block, an error occurs, as expected.
This is a regression from v6.2.3 / WinPS.
Steps to reproduce
Submit at the prompt:
'foo' -is [string
'foo' -as [string Expected behavior
A statement-terminating error with message:
Missing ] at end of attribute or type literal.
Actual behavior
Both commands fail quietly, and $? even contains $true.
Environment data
PowerShell Core 7.0.0-rc.1