let rec fun x 5 + x printfn (fun 3)
Standard input is empty
/home/HKkrhk/prog.fs(1,9): error FS0010: Unexpected keyword 'fun' in binding
/home/HKkrhk/prog.fs(4,15): error FS0010: Incomplete structured construct at or before this point in lambda expression. Expected '->' or other token.
/home/HKkrhk/prog.fs(4,9): error FS0583: Unmatched '('
Standard output is empty