Golang func main() 在 main 以外的包中？

Question

以helloworld为例，包名是main，还有func main()语句。但是我也看到了 func main() 的代码，它在其他一些包中。然而，该代码似乎可以用作独立程序。那么，func main() 的包语句不是 package main 是什么意思？

Answer 1

Go 编程语言由其规范定义。

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The Go Programming Language Specification

Program execution

A complete program is created by linking a single, unimported package called the main package with all the packages it imports, transitively. The main package must have package name main and declare a function main that takes no arguments and returns no value.

func main() { … }

Program execution begins by initializing the main package and then invoking the function main. When that function invocation returns, the program exits. It does not wait for other (non-main) goroutines to complete.

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函数名main在package main之外没有特殊意义。