<+- * / <+- prop

def formjoinin(self):
        '''
        <+- * / <+- prop
        '''

        self.ignore(whitespace)

        self.nextmust('<+-')

        self.ignore(whitespace)

        if self.nextchar() == '*':
            self.offs += 1
            return s_ast.PivotIn(isjoin=True)

        prop = self.absprop()
        return s_ast.PivotInFrom(kids=(prop,), isjoin=True)