“&"没有参数 [英] The "&" with no parameters

问题描述

我有这个:

    case test123(&(:some_module.test456(789))) do
      # ...
    end

一个错误:

invalid args for &, expected an expression in the format of &Mod.fun/arity, 
&local/arity or a capture containing at least one argument as &1, 
got: :some_module.test456(789)

但是，我没有要传递给它的参数，以前它只是

However, I don't have a parameter to pass into it and previously it was merely

 fn(_) -> :some_module.test456(789) end

如何解决?切换回"fn"?

How to fix it? Switch back to "fn"?

推荐答案

& 语法不能用于创建此类匿名函数，因为编译器无法知道您是否要创建0或1或2个或更多Arity函数.您必须继续使用 fn(_)->:some_module.test456(789)结尾.

The & syntax cannot be used to create such anonymous functions because the compiler can't know whether you wanted to create a 0 or 1 or 2 or more arity function. You'll have to keep using fn(_) -> :some_module.test456(789) end.

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