为什么 FParsec 示例没有 运行?

Why doesn't the FParsec example run?

所以我运行从 FParsec 示例中提取了以下代码,但它似乎不想 运行。

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

问题出在最后一行 - 我收到此错误:

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

代码来自这里:

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

如果重要的话,我 运行ning 的 F# 版本是:

Microsoft (R) F# Interactive version 12.0.30110.0

>>.定义在FParsec.Primitives中,所以你也需要打开它。或者,您可以只打开 FParsecsince

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

解释了您看到的错误的原因。