Go 戈朗'；s内置函数实现

我找不到内置函数的实现

在builtin.go中，我发现：

// The copy built-in function copies elements from a source slice 
into a
// destination slice. (As a special case, it also will copy bytes 
from a
// string to a slice of bytes.) The source and destination may 
overlap. Copy
// returns the number of elements copied, which will be the minimum 
of
// len(src) and len(dst).
func copy(dst, src []Type) int

内置功能的实际实现在哪里？

重复？总之，简短的回答是“在运行时代码中”，看那里。可能的重复可能的重复