Re: E123 when referring to function argument

> 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()

The argument of the "func" command is a function name, not an
expression. You are passing a variable, which is an expression.

There is a trick you can use: Assign the function reference to a global
variable. Function names exist in the global namespace where the global
variable can also be found:

def g:LambdaText(Op: func(): number): void
g:ThatFunction = Op
func g:ThatFunction
unlet g:ThatFunction
enddef


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