Unreachable code assertion

Unreachable code assertion

This is an assertion failure that triggers when code that should be unreachable actually got executed somehow. The simple way that programmers have done this in the past is:

   yassert(0);  // unreachable

And you can finesse that a little with just a better name:

    #define yassert_not_reached()   ( yassert(false) )
    ...
    yassert_not_reached(); // unreachable

Here's a nicer version with a better error message:

    #define yassert_not_reached() \
        ( aussie_yassert_fail("Unreachable code was reached", __FILE__, __LINE__) )

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