nameof operator doesn't work

[Guest JohnyL]

I'm learning F#. Here's the code:

 

let f x =

let m = nameof x

m

 

[<EntryPoint>]

let main argv =

let x = f "z"

0

 

However, I get the following error: The value or constructor 'nameof' is not defined.

 

What I'm doing wrong?

 

 

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