by ej@evanjones.ca:

The go vet docs state: "Its exit code is 2 for erroneous invocation of the tool, 1
if a problem was reported, and 0 otherwise." However, the command only ever returns
0 or 2. I tested both with go1.2 and go version devel +9963a911bc14 Thu Dec 26 13:03:30
2013 -0800 darwin/amd64. See the commands below.

Result:
* Exit code success: 0
* Exit code after warning: 0 (SHOULD BE 1)
* Exit code with bad flags: 2



example.go:

package main

import (
    "fmt"
    "go/ast"
)

func main() {
    c := ast.Comment{0, "text"}
    fmt.Println("c: ", c)
}



Commands:

Yoho:~ ej$ go version
go version go1.2 darwin/amd64
Yoho:~ ej$ go vet example.go; echo "CODE: $?"
example.go:9: go/ast.Comment composite literal uses unkeyed fields
CODE: 0
Yoho:~ ej$ go vet -bad example.go &> /dev/null; echo "CODE: $?"
CODE: 2
Yoho:~ ej$ go tool vet example.go; echo "CODE: $?"
example.go:9: go/ast.Comment composite literal uses unkeyed fields
CODE: 0
Yoho:~ ej$ /usr/local/go/pkg/tool/darwin_amd64/vet example.go; echo "CODE: $?"
example.go:9: go/ast.Comment composite literal uses unkeyed fields
CODE: 0