[Issue 13228] Value range analysis for the length of slices

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=13228

--- Comment #1 from bearophile_h...@eml.cc ---
Beside allowing safe implicit casts as shown above, this feature is also able
to catch slice-related bugs at compile time, like in this code:


int x = 11;
void main() {
    int[100] a;
    const b = a[5 .. 5 + x];
    int[10] c = b;
}


That in dmd 2.066beta5 compiles without errors, and throws an error at
run-time:

object.Error@(0): Array lengths don't match for copy: 11 != 10

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