Added is keyword

syntax/laye.tmLanguage.json

@@ -72,7 +72,7 @@
 			"patterns": [
 				{
 					"name": "keyword.laye",
-					"match": "\\b(?:alias|alignof|and|as|assert|break|c(?:ast|atch|allconv|ase|onst|ontinue)|default|defer|delete|discard|discardable|do|else|enum|export|for|foreign|from|goto|if|import|inline|mut|new|not|offsetof|operator|or|return|sizeof|struct|switch|test|try|varargs|variant|xor|xyzzy)\\b"
+					"match": "\\b(?:alias|alignof|and|as|assert|break|cast|catch|callconv|case|const|continue|default|defer|delete|discard|discardable|do|else|enum|export|for|foreign|from|goto|if|import|inline|is|mut|new|not|offsetof|operator|or|return|sizeof|struct|switch|test|try|varargs|variant|xor|xyzzy)\\b"
 				},
 				{
 					"name": "constant.language.laye",
@@ -142,7 +142,7 @@
 		},
 		"type": {
 			"name": "entity.name.type.laye",
-			"match": "(?<=\\b(?:alias|const|enum|struct|variant)\\s+)[0-9A-Z_a-z]+\\b|(?<![0-9A-Z_a-z]\\s+)\\b[0-9A-Z_a-z]+\\b(?=(?:\\s*<[\\s,0-9A-Z_a-z]*>)?[\\s&*?]*[0-9A-Z_a-z{])|(?<=<(?:[\\s,0-9A-Z_a-z]+,)?\\s*)[0-9A-Z_a-z]+(?=\\s*[,>])"
+			"match": "(?<=\\b(?:alias|const|enum|struct|variant)\\s+)[0-9A-Z_a-z]+\\b|(?<![0-9A-Z_a-z]\\s+)\\b[0-9A-Z_a-z]+\\b(?!\\s*(?:and|is|x?or)\\b)(?=(?:\\s*<[\\s,0-9A-Z_a-z]*>)?[\\s&*?]*[0-9A-Z_a-z{])|(?<=<(?:[\\s,0-9A-Z_a-z]+,)?\\s*)[0-9A-Z_a-z]+(?=\\s*[,>])"
 		},
 		"function": {
 			"name": "entity.name.function.laye",