Extends ``leaveWhitespace`` defined in base class, and also invokes ``leaveWhitespace`` on
           all contained expressions.

def leaveWhitespace( self ):
        """Extends ``leaveWhitespace`` defined in base class, and also invokes ``leaveWhitespace`` on
           all contained expressions."""
        self.skipWhitespace = False
        self.exprs = [ e.copy() for e in self.exprs ]
        for e in self.exprs:
            e.leaveWhitespace()
        return self