...44:36 PDT ---

What about Func(1 - len)

The compiler can't cover every case...

...calculate the len of a null
terminated string.

We're talking about:
uint len = strlen...

...len = cast(uint)ir.length - start;
                next();
                ir ~= Bytecode(-4);
                ir ~= ir[start .. start+len...

...Although I think a tool like: char[len] stackString; would be a super-useful tool...

...if I want to call a method? len = x.length for instance? Properties are almost...

...I like Python for having a free len() function that's usable for higher order...

...languages, where if(arr) means if its len is different from zero.

D dynamic arrays...

...uint len;
        if (!receiveExact((cast(ubyte*)&len)[0..uint.sizeof]))
            return false;
        dat.length = len...

...const data = [1, 5, 2].sort();
    auto len = data.length;
}


DMD 2.063alpha gives:

temp...

...3,4,5];
size_t len = cast(size_t)(arr == arr3);
assert(len == arr.length);