use std const main = {	/* Raw ASCII */	std.assert(std.strcellwidth("foobar") == 6, "wrong width of \"foobar\"")	std.assert(std.strcellwidth("") == 0, "wrong width of \"\"") 	/* Control characters */	var ab = [ (0x63 : byte), (0x00 : byte), (0x64 : byte) ][:]	std.assert(std.strcellwidth(ab) == 2, "wrong width of \"a^@b\"") 	/* Accents and combining marks */	std.assert(std.strcellwidth("Αυτό") == 4, "wrong width of \"Αυτό")	std.assert(std.strcellwidth("ŗšțūžäñ") == 7, "wrong width of \"ŗšțūžäñ")	std.assert(std.strcellwidth("c̸̶̡̡̗̣͕̪͖ͯ͑̈̄̿͊ͣ̈́͝ḧ̵̸̛̥͚̭̣͈͖̼͈͓͓̫͍́̓ͪͫ̋͘͡a̢̩̱̠̘̹̤̯͚̦̰̼̯̲̞͆͂̿ͬ̂͋͒̈ͅͅo̷̷̶̥͖̼̮̳̗͚ͦ̉̆̅̃̍ͤ̆͑ͣ̽́̚s̓̍̍̄͏̖̞̟̱́͡͡͝") == 5, "wrong width of \"c̸̶̡̡̗̣͕̪͖ͯ͑̈̄̿͊ͣ̈́͝ḧ̵̸̛̥͚̭̣͈͖̼͈͓͓̫͍́̓ͪͫ̋͘͡a̢̩̱̠̘̹̤̯͚̦̰̼̯̲̞͆͂̿ͬ̂͋͒̈ͅͅo̷̷̶̥͖̼̮̳̗͚ͦ̉̆̅̃̍ͤ̆͑ͣ̽́̚s̓̍̍̄͏̖̞̟̱́͡͡͝\"")	std.assert(std.strcellwidth("q̆") == 1, "wrong width of \"q̆\"")	std.assert(std.strcellwidth(" ͝ ⃔ ⃫") == 3, "wrong width of \" ͝ ⃔ ⃫\"")	std.assert(std.strcellwidth("f⃫⃔͝") == 1, "wrong width of \"f⃫⃔͝\"") 	/* Non-Latin scripts */	std.assert(std.strcellwidth("Οὐχὶ ταὐτὰ παρίσταταί") == 21, \		"wrong width of Greek")	std.assert(std.strcellwidth("Я человек больной...") == 20, \		"wrong width of Cyrillic")	std.assert(std.strcellwidth("銀河の歴史がまた1ページ") == 23, \		"wrong width of CJK")	std.assert(std.strcellwidth("ᚻᛖ ᚳᚹᚫᚦ ᚦᚫᛏ ᚻᛖ ᛒᚢᛞᛖ") == 19, \		"wrong width of runes")	std.assert(std.strcellwidth("𒀸 𒌋𒅗 𒆷 𒂅𒌒 𒍜 𒀭𒉌𒄿 𒈗 𒁁𒉌 𒋬") == 22, \		"wrong width of Cuneiform") 	/* graphemestep() */	var s = "̀a史c\tЯx̀̀̀̀̀\nz̉"	var sub, rest 	(sub, rest) = std.graphemestep(s)	std.assert(std.eq(sub, "̀"), "didn't get U+0300 as next grapheme") 	(sub, rest) = std.graphemestep(rest)	std.assert(std.eq(sub, "a"), "didn't get \"a\" as next grapheme") 	(sub, rest) = std.graphemestep(rest)	std.assert(std.eq(sub, "史"), "didn't get \"史\" as next grapheme") 	(sub, rest) = std.graphemestep(rest)	std.assert(std.eq(sub, "c"), "didn't get \"c\" as next grapheme") 	(sub, rest) = std.graphemestep(rest)	std.assert(std.eq(sub, "\t"), "didn't get \"\\t\" as next grapheme") 	(sub, rest) = std.graphemestep(rest)	std.assert(std.eq(sub, "Я"), "didn't get \"Я\" as next grapheme") 	(sub, rest) = std.graphemestep(rest)	std.assert(std.eq(sub, "x̀̀̀̀̀"), "didn't get \"x̀̀̀̀̀\" as next grapheme") 	(sub, rest) = std.graphemestep(rest)	std.assert(std.eq(sub, "\n"), "didn't get \"\\n\" as next grapheme") 	(sub, rest) = std.graphemestep(rest)	std.assert(std.eq(sub, "z̉"), "didn't get \"z̉\" as next grapheme") 	(sub, rest) = std.graphemestep(rest)	std.assert(sub.len == 0, "didn't get \"\" as last grapheme")  	/* with excessive combiners */	s = "\tc̸̶̡̡̗̣͕̪͖ͯ͑̈̄̿͊ͣ̈́͝ḧ̵̸̛̥͚̭̣͈͖̼͈͓͓̫͍́̓ͪͫ̋͘͡a̢̩̱̠̘̹̤̯͚̦̰̼̯̲̞͆͂̿ͬ̂͋͒̈ͅͅo̷̷̶̥͖̼̮̳̗͚ͦ̉̆̅̃̍ͤ̆͑ͣ̽́̚s̓̍̍̄͏̖̞̟̱́͡͡͝" 	(sub, rest) = std.graphemestep(s)	std.assert(std.eq(sub, "\t"), "didn't get \"\\t\" as next grapheme") 	(sub, rest) = std.graphemestep(rest)	std.assert(std.eq(sub, "c̸̶̡̡̗̣͕̪͖ͯ͑̈̄̿͊ͣ̈́͝"), "didn't get \"c̸̶̡̡̗̣͕̪͖ͯ͑̈̄̿͊ͣ̈́͝\" as next grapheme") 	(sub, rest) = std.graphemestep(rest)	std.assert(std.eq(sub, "ḧ̵̸̛̥͚̭̣͈͖̼͈͓͓̫͍́̓ͪͫ̋͘͡"), "didn't get \"ḧ̵̸̛̥͚̭̣͈͖̼͈͓͓̫͍́̓ͪͫ̋͘͡\" as next grapheme, it was {}", rest) 	(sub, rest) = std.graphemestep(rest)	std.assert(std.eq(sub, "a̢̩̱̠̘̹̤̯͚̦̰̼̯̲̞͆͂̿ͬ̂͋͒̈ͅͅ"), "didn't get \"a̢̩̱̠̘̹̤̯͚̦̰̼̯̲̞͆͂̿ͬ̂͋͒̈ͅͅ\" as next grapheme") 	(sub, rest) = std.graphemestep(rest)	std.assert(std.eq(sub, "o̷̷̶̥͖̼̮̳̗͚ͦ̉̆̅̃̍ͤ̆͑ͣ̽́̚"), "didn't get \"o̷̷̶̥͖̼̮̳̗͚ͦ̉̆̅̃̍ͤ̆͑ͣ̽́̚\" as next grapheme") 	(sub, rest) = std.graphemestep(rest)	std.assert(std.eq(sub, "s̓̍̍̄͏̖̞̟̱́͡͡͝"), "didn't get \"s̓̍̍̄͏̖̞̟̱́͡͡͝\" as next grapheme") 	(sub, rest) = std.graphemestep(rest)	std.assert(sub.len == 0, "didn't get \"\" as last grapheme") 	/* now with invalid UTF-8 */	s = [ ('A' : byte), ('b' : byte), (0xFE : byte),	      (0xFF : byte), (0x92 : byte), ('c' : byte) ][:] 	(sub, rest) = std.graphemestep(s)	std.assert(std.eq(sub, "A"), "didn't get \"A\" as next grapheme") 	(sub, rest) = std.graphemestep(rest)	std.assert(std.eq(sub, "b"), "didn't get \"b\" as next grapheme")  	(sub, rest) = std.graphemestep(rest)	std.assert(std.eq(sub, [ (0xFE : byte) ][:]), "didn't get 0xEE, len={} as next grapheme", sub.len) 	(sub, rest) = std.graphemestep(rest)	std.assert(std.eq(sub, [ (0xFF : byte) ][:]), "didn't get 0xEA as next grapheme") 	(sub, rest) = std.graphemestep(rest)	std.assert(std.eq(sub, [ (0x92 : byte) ][:]), "didn't get 0xEF as next grapheme") 	(sub, rest) = std.graphemestep(rest)	std.assert(std.eq(sub, "c"), "didn't get \"c\" as next grapheme")}