Swift complexity should include "guard"

[AndyDentFree]

Describe the bug
The common guard statement is not handled. This is equivalent to an up-front test in C++ such as if (blah == nullptr) return;

A less-important addition would be to add defer which is equivalent to using the C++ RAII idiom but is simpler, with a statement rather than needing a helper class.

To Reproduce
I reviewed languages.json and noticed guard is missing.

Expected behavior
Count guard to add to complexity. It's a very common part of control flow in many Swift functions. It is often the only branch expression in a function.

Also suggest adding defer which is less common but can't see a reason not to add it as it's a reserved word.

Desktop:

• OS: macOS
• Version 3.4.0

[apocelipes]

I do not think defer should be counted because defer does not generate any branch:

The document says "always runs", so no conditions here.

I'll try to add guard, it actually generates branches. ? and catch should be counted too. AFAIK other complexity counting tools like lizard also count them.