这个论点如何扩大？

Consider the following program which I'm running via MinGW:

package main

import (
    "fmt"
    "os"
)

func main() {
    fmt.Println(os.Args[1])
}

When I run the command go run test.go /home it prints C:/Program Files/Git/home.

I suspected that the shell might be expanding the relative path. But running echo /home prints only /home.

What is changing the argument for my golang program?

This must be MinGW or the shell that you are running that expands the parameter - to confirm it is not Go specific, try a simple shell script that prints $0 and $1 and run it with the /home parameter.