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