Valid, but worthless syntax in switch-case?

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Through a little typo, I accidentally found this construct:

int main(void) {
    char foo = 'c';

    switch(foo)
    {
        printf("Cant Touch This\n");   // This line is Unreachable

        case 'a': printf("A\n"); break;
        case 'b': printf("B\n"); break;
        case 'c': printf("C\n"); break;
        case 'd': printf("D\n"); break;
    }

    return 0;
}

It seems that the printf at the top of the switch statement is valid, but also completely unreachable.

I got a clean compile, without even a warning about unreachable code, but this seems pointless.

Should a compiler flag this as unreachable code?
Does this serve any purpose at all?

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