This is related to #1284. See also: https://bugs.webkit.org/show_bug.cgi?id=146047

Some unit tests (that check for invalid syntax) fail on Safari. This is because column property of an Error object is read only.

Run this on Safari (or check this snippet: http://jsbin.com/pexocaruce/edit?js,console):

function createError(msg) {
  var error = new Error(msg);
  error.column = 42;
  console.log('error.column', error.column);
 return error;
}

function throwError(msg) {
  throw createError(msg);
}

try {
  throwError('Hello Universe');
} catch (e) {
  console.log('e.column', e.column);
}

It should say that column is 25, despite the fact that its value is set to 42. Chrome and Firefox behave as expected, showing 42.