Please do not overdo Unicode outside the ASCII realm for identifiers and stay away from Emoji: [Wayback/Archive] Kris on Twitter: “Company chat: »Right, we need more languages with Emoji as variable type indicators and pointer symbols.«…”
Company chat: »Right, we need more languages with Emoji as variable type indicators and pointer symbols.«
»initializer
«
»mutable,
not.«
»on the heap,
on the stack«
»ctor,
dtor«
»� non-utf string result«
»any ofas a concat operator«
»block delims«
Just in case you didn’t get which Emoji is which, and how complex your Identifier BNF needs to be to support them: you can find the used Emoji via [Wayback/Archive] What Unicode character is this ? (the list below has IDs, code points and names copied from the official Unicode [Wayback/A] Emoji List, v14.0):
Character Code Sample CLDR Short Name Other Keywords U+1F3BC musical score music | musical score | score U+1F3B1 pool 8 ball 8 | ball | billiard | eight | game | pool 8 ball U+1F4A6 sweat droplets comic | splashing | sweat | sweat droplets U+1F9F1 brick brick | bricks | clay | mortar | wall U+1F381 wrapped gift box | celebration | gift | present | wrapped U+1F95E pancakes breakfast | crêpe | food | hotcake | pancake | pancakes U+1F37C baby bottle baby | bottle | drink | milk U+1FAA6 headstone cemetery | grave | graveyard | headstone | tombstone � U+FFFD � REPLACEMENT CHARACTER U+1F469 woman adult | woman U+200D ZERO WIDTH JOINER ZWJ U+2764 red heart heart | red heart U+F0EF VARIATION SELECTOR-16 [VS16] VS16 U+1F48B kiss mark kiss | kiss mark | lips U+1F468 man adult | man U+1F4C1 file folder file | folder U+1F4C2 open file folder file | folder | open
Note that � is not actually an Emoji and that 
was hardest as it is a bunch of Unicode code points (one with a variation selector) on top of each other (that is why it was split apart above) using the zero-width joiner code point feature:
[Wayback/Archive]
kiss: woman, man : U+1F469 200D 2764 FE0F 200D 1F48B 200D 1F468 Unicode Information | EmojiAll
U+1F469 : WOMANU+200D : ZERO WIDTH JOINER [ZWJ]U+2764 : HEAVY BLACK HEARTU+FE0F : VARIATION SELECTOR-16 [VS16] {emoji variation selector}U+200D : ZERO WIDTH JOINER [ZWJ]U+1F48B : KISS MARK {lips}U+200D : ZERO WIDTH JOINER [ZWJ]U+1F468 : MAN
From a BNF point of view it might be a lot easier to just allow Emoticon in stead of Emoji in identifiers, but Emoticons tend to use symbols used in other places of the language.
Oh, below is the image Kris quoted, as it is similar to both Unicode “magic” and programming identifier “magic”:
–jeroen