#NEWLINE# def root_tables( self ) : #NEWLINE# #INDENT# ( base , cases , results , default ) = self . args #NEWLINE# all_exprs = ( ( [ base ] + cases ) + results ) #NEWLINE# if ( default is not None ) : #NEWLINE# #INDENT# all_exprs . append ( default ) #NEWLINE# #UNINDENT# return ir . distinct_roots ( * all_exprs )