line number not generated for first statement if it is on the same function declaration line

Example script: t.js

function func1() { func2() }

function func2() { throw new Error(); }

try {
    func1()
} catch (e) {
    print(e.stack)
}


Expected output:

func2 @ x.js:3
func1 @ x.js:1
<program> @ x.js:6

Output seen:

 
func2 @ x.js:-1
func1 @ x.js:-1
<program> @ x.js:6