protected function validateInterfaceStatement(Interface_ $stmt)
    {
        $this->ensureCanDefine($stmt, self::INTERFACE_TYPE);
        $this->ensureInterfacesExist($stmt->extends, $stmt);
    }
protected function validateInterfaceStatement(Interface_ $stmt)
    {
        $this->ensureCanDefine($stmt, self::INTERFACE_TYPE);
        $this->ensureInterfacesExist($stmt->extends, $stmt);
    }
protected function validateInterfaceStatement ( Interface_ $ stmt ) { $ this -> ensureCanDefine ( $ stmt , self :: INTERFACE_TYPE ) ; $ this -> ensureInterfacesExist ( $ stmt -> extends , $ stmt ) ; }
Validate an interface definition statement.

@param Interface_ $stmt
Validate an interface definition statement .