confuse with "go vet error is not a type"

[wangcheng711]

What version of Go are you using (go version)?

$ go version
go version go1.12.7 linux/amd64

What did you do?

the sample code:

package main

import (
	"log"
	"os"
)

func main() {
	file, error := os.Open("hs.json")
	if error != nil {
		log.Println("open file ", error)
		return
	}
	defer file.Close()
	h := func(string) error {
		return nil
	}
	h("hello")

}

What did you see instead?

i am beginner with golang, the go vet output is 'error is not a type'. so, it can be confusing to fix problem

[bcmills]

Go has a flat namespace: variable names and and type-names can (and do) shadow each other.

Here, you have declared a local variable error (on line 9), and it shadows the declaration of the built-in type error.

[bcmills]

Duplicate of #33567