I have simple function that calls simple functions that return unit or string

but in the end it return unit..

I don't know why the compiler say the function is:

unit-> (string -> unit) -> string -> unit

What exactly that means?

How can I do that the function will be

unit->unit

example:

member this.doStatmentSyntax() =

try

this.varifyToken "do" //string->unit

currentToken<-this.getNextToken() //unit->string

this.varifyToken "indentifier"

currentToken<-this.getNextToken()

this.subroutineCallSyntax() //unit->unit

currentToken<-this.getNextToken()

this.varifyToken ";"

with

|ErrorToken(str)->raise (ErrorDoStatmentSyntax (str+"->DoStatment"))

|ErrorvarifyToken(str)->raise (ErrorDoStatmentSyntax (str+"->doStatment"))

|ErrorSubroutineCallSyntax(str)->raise (ErrorDoStatmentSyntax (str+"->doStatment"))

thank you..