#NEWLINE# def test_plain_exists_negate( self ) : #NEWLINE# #INDENT# expr = ( ~ exists ( [ 1 ] ) ) #NEWLINE# eq_ ( type ( expr . type ) , Boolean ) #NEWLINE# eq_ ( [ type ( self [ ( - 1 ) ] ) for entry in select ( [ expr ] ) . compile ( ) . _result_columns ] , [ Boolean ] )