Debugger shows wrong line numbers in local file

Question

I'm using the debugger in Safari 5 for a web app that is entirely made up of local files (it's actually a dashboard widget). For most files it's fine, but there are a few where there appears to be a skew between the actual line number and the line number displayed by Safari. As a result, some errors are displayed with the wrong line number (e.g. "Syntax error on line 5" when the actual line is 2). More troublingly, if I place a breakpoint in a file, it acts as if it is on the wrong line so when I step through the code the current line is actually different from the one displayed by the debugger.
The weird thing is that the line numbers displayed in the script panel are all correct, so line 47 really says "47" in the left margin, but Safari still thinks that it is line 44. In general, the skew seems to be constant and equal to -3, so the real current line when debugging is 3 lines higher than the one displayed as the current line in the debugger.

Answer 1

This looks to me like a Safari bug. I did some experimentation, and it appears to be caused by the use of the newer getter syntax in an object prototype. When I do this the debugger seems to set breakpoints at the wrong lines as described in my previous post:
function foo() {
foo.prototype = {
  get bar() {
  do_it: function() {
    var baz = 1;
var obj = new foo();
obj.do_it();
If remove the definition of the bar getter or change it to use the older __defineGetter__ syntax then the problem goes away.