Understanding scope of functions in powershell workflow

Copy and paste the following into a new Powershell ISE script and hit F5:

workflow workflow1{
    "in workflow1"
    func1
}
function func1 {
    "in func1"
    func2
}
function func2 {
    "in func2"
}
workflow1

the error I get is:

The term 'func2' is not recognized as the name of a cmdlet, function, script file, or operable program

I don't understand this. Why would func1 be in scope but not func2? Any help much appreciated. TIA.

Think of Workflows as short-sighted programming elements.

A Workflow cannot see beyond what's immediately available in the scope. So nested functions are not working with a single workflow, because it cannot see them.

The fix is to nest workflows along with nested functions. Such as this:

workflow workflow1
{
    function func1 
    {
        "in func1"
        workflow workflow2
        {
            function func2 
            {
                "in func2"
            }
            func2
        }
        "in workflow2"
        workflow2
    }
    "in workflow1"
    func1
}
workflow1

Then it sees the nested functions:

in workflow1
in func1
in workflow2
in func2

More about it here