用ocamlfind查找OCaml编译错误

Question

以下是代码：

class parser =

let test1 = function
| 1 -> print_int 1
| 2 -> print_int 2
| _ -> print_int 3 in

let test = function
| 1 -> print_int 1
| 2 -> print_int 2
| _ -> print_int 3 in

object(self)

end

这是_tags

true: syntax(camlp4o)
true: package(deriving,deriving.syntax)
true: thread,debug,annot
true: bin_annot

以下是编译命令：

ocamlbuild -use-ocamlfind test.native

以下是编译错误：

Warning: tag "package" does not expect a parameter, but is used with parameter   "deriving,deriving.syntax"
Warning: tag "syntax" does not expect a parameter, but is used with parameter "camlp4o"
+ /usr/local/bin/ocamldep.opt -modules test.ml > test.ml.depends
File "test.ml", line 8, characters 0-3:
Error: Syntax error
Command exited with code 2.
Compilation unsuccessful after building 1 target (0 cached) in 00:00:00.

但是，当我使用这个时：

ocamlbuild test.native

然后代码就可以被成功编译..。

Answer 1

这是因为ocamlbuild -use-ocamlfind test.native指示编译器使用camlp4解析器。它与标准的OCaml解析器略有不同。实际上，parser是camlp4中的关键字，所以不能将它用作类名。改名就行了。