E123 when referring to function argument

Hello.

I want to peek into a lambda so I can evaluate it in a new Vim process. Why do I get 'E123: Undefined function: Op' when I source this script?

vim9script
def! g:LambdaText(Op: func(): number): void
    func Op
enddef

def! g:TestRun(): void
    g:LambdaText(() => 2 * 4)
enddef

g:TestRun()

Matan

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