go vet on closed over loop

foo.sh

# One might think this "should" be caught by go vet, but it's not in my simple test. 
# 
# From go doc cmd/vet:
##
## Range loop variables
## 
## Flag: -rangeloops
## 
## Incorrect uses of range loop variables in closures.
## 
## 
## Shadowed variables
## 
## Flag: -shadow=false (experimental; must be set explicitly)
## 
## Variables that may have been unintentionally shadowed.

os@os-900:/tmp$ go run foo.go 
Example A - Count to 2, This works :) 
a is: 0
a is: 1
a is: 2


Example B - Count to 2, concurrently.
This does not work :( 
b is: 3
b is: 3
b is: 3


os@os-900:/tmp$ go vet foo.go 
os@os-900:/tmp$ 
os@os-900:/tmp$ go tool vet -shadow -shadowstrict  foo.go 
os@os-900:/tmp$

# From http://oyvindsk.com/writing/common-golang-mistakes-1

os@os-900:/tmp$ cat foo.go 
package main

import (
        "fmt"
        "time"
)

func main() {

        // A
        fmt.Println("Example A - Count to 2, This works :) ")
        for a := 0; a < 3; a++ {
                fmt.Println("a is:", a)
        }

        // B
        fmt.Println("\n\nExample B - Count to 2, concurrently.")
        fmt.Println("This does not work :( ")
        for b := 0; b < 3; b++ {
                // Run fmt.Println(..) in the background
                go func() {
                        fmt.Println("b is:", b)
                }()
        }

        // we sleep to let the go functions finish before the program quits
        time.Sleep(2 * time.Second)
}