Odd syntax error difference when in testing

[Brendan Tracey]

When one forgets an equality statement before a range, the compiler normally gives a very nice error

 prog.go:7: syntax error: unexpected range, expecting := or = or comma  

as in http://play.golang.org/p/Wodwxx-xsg

However, running the same code using go test 

func TestFoo(t *testing.T){

     slc := []int{1,2,3}

     for _,val range slc{

          fmt.Println("Hello, playground")

     }

}

gives the error "expected 1 expression". Is there a reason that I am missing for this difference? The first error is way more useful.

[Rob Pike]

Go test uses the go/parser package to build the test, which is then
compiled by the usual compiler. The syntax errors can therefore
differ.

-rob