Switch ignores case (?)

[Chris via Digitalmars-d-learn]

On Wednesday, 23 November 2016 at 19:30:01 UTC, ketmar wrote:
> On Wednesday, 23 November 2016 at 19:07:49 UTC, Chris wrote:
>> It has something to do with the smart quote, e.g.:
>
> it is wrong binary search in `_d_switch_string()`.
>
> strings for switch are lexically sorted, and compiler calls 
> `_d_switch_string()` to select one. the thing is that 
> comparison in `_d_switch_string()` is done with `memcmp()`. 
> still not clear? ok, let's see how cases are encoded:
>
> body _d_switch_dstring()
>        'U0027' (ca)
> table[0] = 1, 'U0027'
> table[1] = 1, 'U2019'
>
> or, in memory:
>
> table[0] = 1, 0x27, 0x00
> table[1] = 1, 0x19, 0x20
>
> so, memcmp for `table[1]` returns... 1! 'cause 0x27 is greater 
> than 0x19. and binsearch is broken from here on. the same is 
> true for `_d_switch_ustring()`, of course.
>
> this can be fixed either by using slow char-by-char comparisons 
> in druntime, or by fixing codegen, so it would sort strings as 
> byte arrays.

Actually, I came across a compiler message that gave me something 
like \x19\x20 which I found odd. This sure needs fixing. After 
all, it's quite a basic feature. So it's back to the old `if` 
again (for now).