Why doesn't the FParsec example run?

Question

So I'm running the following code from the FParsec sample, but it doesn't seem to want to run.

namespace Test
open FParsec.CharParsers
module Stuff =
  let main = run pfloat "1.25E3"
  let str s = pstring s
  let floatBetweenBrackets = str "[" >>. pfloat .>> str "]"

The problem is the last line - I get this error:

Error   1   Expecting a type supporting the operator '>>.' but given a function type. You may be missing an argument to a function. C:\Users\...\Documents\Visual Studio 2013\Projects\Solution2\ConsoleApplication1\load.fs    6   42  Formatting

The code is from here:

http://www.quanttec.com/fparsec/tutorial.html#parsing-a-float-between-brackets

If it matters, the version of F# I'm running is:

Microsoft (R) F# Interactive version 12.0.30110.0

Answer 1

>>. is defined in FParsec.Primitives, so you need to open that as well. Alternatively, you can just open FParsec, since

Opening the FParsec namespace also automatically opens the Primitives, CharParsers and Error modules.

This answer explains why the error you're seeing is what it is.