class TestClass {
    [string] hidden $prop

    [string]Prop() {
        return $this.prop
    }
}

$obj = [TestClass]::new()

PS C:\EDICore> $obj | Get-Member


   TypeName: TestClass

Name        MemberType Definition
----        ---------- ----------
Equals      Method     bool Equals(System.Object obj)
GetHashCode Method     int GetHashCode()
GetType     Method     type GetType()
Prop        Method     string Prop()
ToString    Method     string ToString()


PS C:\EDICore> $obj.Prop()
Method invocation failed because [TestClass] does not contain a method named 'Prop'.
At line:1 char:1
+ $obj.Prop()
+ ~~~~~~~~~~~
+ CategoryInfo          : InvalidOperation: (:) [], RuntimeException
+ FullyQualifiedErrorId : MethodNotFound

> $PSVersionTable
Name                           Value
----                           -----
PSVersion                      6.1.0
PSEdition                      Core
GitCommitId                    6.1.0
OS                             Microsoft Windows 6.1.7601 S
Platform                       Win32NT
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0...}
PSRemotingProtocolVersion      2.3
SerializationVersion           1.1.0.1
WSManStackVersion              3.0