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## golang 同一个包中函数互相调用报错 undefined
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demo 文件夹下有两个文件,分别为 hello.go 和 main.go ,结构如下:
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```
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demo/
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├── hello.go
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└── main.go
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```
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文件内容如下:
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```go title="hello.go"
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package main
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import "fmt"
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func hello() {
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fmt.Println("hello, world")
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}
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```
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```go title="main.go"
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package main
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func main() {
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hello()
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}
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```
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允许代码后报错:./main.go:4:2: undefined: hello
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**原因**:Go 中 main 包默认不会加载其他文件, 而其他包都是默认加载的。
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**解决方法**:
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1. 执行 `go run main.go hello.go`
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