英文:
How to import package "constraints" in Go?
问题
如果你想学习Go语言，可以参考这个链接：https://go.dev/tour/
你可以尝试使用类似"Ordered"的约束条件。
然而，导入"constraints"会返回一个错误：
package constraints is not in GOROOT
英文:
If you do the tour to learn go here :
You may try to use constraints like Ordered.
However,
import "constraints"
returns an error :
package constraints is not in GOROOT
答案1
得分: 3
"constraints"包不是标准库的一部分，也从未是过，除非在Go 1.18之前的早期开发或测试版本中可能存在。
正确的导入路径是：
import "golang.org/x/exp/constraints"
与x/exp中的所有代码一样，它不在Go的兼容性保证范围内。
不将其包含在标准库中的原因在这里提到：https://github.com/golang/go/issues/50792
英文:
The "constraints" package is not part of the standard library and never was, except perhaps for early dev or beta releases before Go 1.18.
The correct import path is:
import "golang.org/x/exp/constraints"
As all code in x/exp it's outside of Go compatibility guarantee.
The reason for not including it in the standard library is mentioned here: https://github.com/golang/go/issues/50792
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