Switch ignores case (?)

[ketmar via Digitalmars-d-learn]

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.