F#评论错误

Question

我在教自己F#我通常是C#程序员.

我正在尝试使用它(**)为自己做笔记,因为我通过章节,但我从评论本身得到一个错误.

module Characters

let vowels = ['a', 'e', 'i', 'o', 'u']

printfn "Hex u0061 = '%c'" '\u0061'

(*  <------------Error is here, is 'End of file in string embedded in comment begun at or before here'
    Character Escape Sequences

    Character       Meaning
    -------------------------------
    \'              Single Quote
    \"              Double Quote
    \\              Backslash
    \b              Backspace
    \n              Newline
    \r              Carriage Return
    \t              Horisontal Tab
*)

这是否将评论视为字符串意味着我必须逃避我的评论？

Answer 1

F#琐事时间!这是设计的. 块注释可以嵌套,块注释中的字符串像常规字符串一样被标记化.在这种情况下,有效的字符文字计为"字符串".

所以这些是有效的块注释:

(* "embedded string, this --> *) doesn't close the comment" *)
(*  (* nested *) comment *)
(* quote considered to be in char literal '"' is ok *)

但这些都不是

(* "this string is not closed *)
(* " this quote --> \" is escaped inside a string *)

并且好像这不够疯狂,对于*从那时开始的操作员有特殊处理,(*)通常会将其视为块注释的开始或结束.

(* I can talk about the operator (*) without ending my comment *)

AFAIK,这些都是从ML继承的(嵌套的注释肯定是,不确定字符串).

因此,出于您的目的,您可能希望执行以下操作:

(*  Character       Meaning
    -------------------------------
    " \' "          Single Quote
    " \" "          Double Quote

    or

    '\''            Single Quote
    '"'             Double Quote
*)