Extended Description

A common pattern in classes with multiple initializers (for example NSView with -initWithFrame: and -initWithCoder:) is to put the subclass's common initialization bits into a static function. If you structure this so that the common init can fail and return nil, then you can end up with something like this:

• init;
  {
  if (!(self = [super init]))
  return nil;
  if (!(self = _commonInit(self)))
  return nil;

  return self;
  }

This provokes a warning about never having assigned self before returning it, which is not true:

double-assign-self.m:28:5: warning: Returning 'self' before setting it to the result of '[(super or self) init...]'