[swift-evolution] Prohibit invisible characters in identifier names

[Josh Wisenbaker]

> On Jun 23, 2016, at 3:54 PM, João Pinheiro via swift-evolution <swift-evolution at swift.org> wrote:
> 
>> On 23 Jun 2016, at 20:43, Xiaodi Wu <xiaodi.wu at gmail.com <mailto:xiaodi.wu at gmail.com>> wrote:
>> That's cool, although my preferred solution would be more closely aligned with UAX #31: overtly disallow the glyphs in Table 4 (instead of ignoring them) except in the specific scenarios for ZWJ and ZWNJ identified in UAX #31, then afterwards internally represent the identifier as its NFC-normalized string.
> 
> Explicitly disallowing them was my initial idea, but I think it would end up being a confusing error for users to encounter. Ignoring the invisible characters and leaving it up to a linter to remove them is less likely to cause confusion for users.

Allowing invisibles has already resulted in being able to do things like this which is intensely confusing to say the very least. 



Josh


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