'if ( a_check<x> )' functionality detection

[randi]

This on its own doesn't declare 'success' (because it's a jumping function)

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TNT1 A 0 A_Jump(111, "bleh")

To clarify, the above should be thought of as a compact way to write:

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TNT1 A 0 { return A_Jump(111, "bleh"); }

Because that's exactly how it gets processed. The two produce exactly the same code for the VM because they are the same.

It has no effect on the success of a CustomInventory state chain not because you called a jumping function but because the jumping function, which returns a state, is called with return to propagate the result out to the caller of your little function.

If it helps, what you are creating with this single line is an anonymous function ("anonymous" because it has no name) with an inferred return type, and the state calls that function. If it was written out as an explicit function (supposing DECORATE could express this), it would look something like this:

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actor MyActor
{
    action state A_MyJumper()
    {
        return A_Jump(111, "bleh");
    }

    states
    {
        TNT1 A 0 A_MyJumper
    }
}

while this does declare 'success' because it doesn't return anything, nevermind its contents, correct?

Correct. This function returns nothing, so it gets counted as success.

[Fishytza]

Right. Everything's clear now. Thank you for being patient with me, Randi.