error #8055: The procedure has a dummy argument that has the ALLOCATABLE, ASYNCHRONOUS, OPTIONAL, POINTER, TARGET, VALUE or VOLATILE attribute. Required explicit interface is missing from original source. [GPARRAY]

这个错误是因为你在一个过程的参数列表中使用了ALLOCATABLE、ASYNCHRONOUS、OPTIONAL、POINTER、TARGET、VALUE或VOLATILE这些属性中的一个或多个。这些属性会导致该参数需要显式接口，但是你的程序中没有提供这个接口。要解决这个错误，你需要在调用这个过程之前，在程序的某个地方提供该过程的显式接口。可以通过在过程中使用INTERFACE块来提供显式接口，或者将过程放在MODULE中，在调用过程时使用USE语句来自动获取过程的接口。

相关问题

AttributeError: module 'threading' has no attribute '_dummy_thread'

如果出现了 "AttributeError: module 'threading' has no attribute '_dummy_thread'" 的错误，这通常是因为您在 Python 3 中尝试使用 Python 2 的线程模块。在 Python 3 中，_dummy_thread 模块已被移除，可以使用 _thread 模块来代替。

所以，您可以尝试在代码开头添加以下代码，以手动设置 PyQt5 为新版本的线程模块：

import sys
if sys.version_info[0] == 2:
    import thread as _thread
else:
    import _thread
import threading
threading._dummy_thread._thread = _thread

这应该可以解决您的问题。如果问题仍然存在，请尝试升级 PyQt5 到最新版本。

Implement the function that searches a given value x in linked list headed with node nil.

Sure, here's an implementation of the function in Python:

class Node:
    def __init__(self, value):
        self.value = value
        self.next = None

def search_linked_list(nil, x):
    node = nil.next
    while node is not None:
        if node.value == x:
            return node
        node = node.next
    return None

Here, `nil` is the head of the linked list, which is typically a dummy node with no value that serves as a placeholder. The `search_linked_list` function takes in `nil` and the value `x` to search for, and returns the node in the linked list that contains `x`, or `None` if `x` is not found.

The function works by starting at the first node after `nil`, and iterating through the linked list until it finds the node with the value `x`. If it traverses the entire linked list without finding `x`, it returns `None`.

Note that this implementation assumes that the values in the linked list are unique. If there can be multiple nodes with the same value, you may need to modify the function to return a list of nodes instead of just one.