The module should be imported but displayed in strikethrough font in Xcode 7.3

Question

UPDATE:

@JAL pointed to the accepted SO answer , which suggests that the behavior described in this question is a BUG , which is now supposed to be fixed. There is no indication of when this fix continues, however.

PREVIOUS UPDATE:

As this answer suggests, Xcode displays import <module_name> in a strikethrough font when it decides that the import is redundant (as I assumed in the original question below). BUT without compiler import <module_name> with error.

Such misconduct is the subject of my initial question. Is this a mistake or am I missing something (for example, the correct link to the framework, etc.)?

ORIGINAL QUESTION:

What does it mean when Xcode, which prompts you to import a module as you type, displays the name of the required module in a string font?

Description:

I want to create a simple subclass of GKEntity . So, in the new .swift file, I add the following:

 class TBTEntity: GKEntity { } 

I know that GKEntity itself is part of the GameplayKit framework. So, I have to import the framework, otherwise I see an error.

Using the undeclared GKEntity Type

From a UX point of view, the strikethrough font offers me something like “you won’t need it” or “the module is unavailable”, but none of this seems really true.

Xcode 7.3 (7D175)