Elm: Recognise unicode escapes as valid Char (#3105)

Author: hoonweiting

components/prism-elm.js

@@ -1,7 +1,7 @@
 Prism.languages.elm = {
 	'comment': /--.*|\{-[\s\S]*?-\}/,
 	'char': {
-		pattern: /'(?:[^\\'\r\n]|\\(?:[abfnrtv\\']|\d+|x[0-9a-fA-F]+))'/,
+		pattern: /'(?:[^\\'\r\n]|\\(?:[abfnrtv\\']|\d+|x[0-9a-fA-F]+|u\{[0-9a-fA-F]+\}))'/,
 		greedy: true
 	},
 	'string': [

components/prism-elm.min.js

@@ -3,6 +3,9 @@
 '\n'
 '\23'
 '\xFE'
+'\u{0000}'
+'\u{1F648}'
+'\u{10FFFF}'
 
 ----------------------------------------------------
 
@@ -11,9 +14,12 @@
 	["char", "'\\''"],
 	["char", "'\\n'"],
 	["char", "'\\23'"],
-	["char", "'\\xFE'"]
+	["char", "'\\xFE'"],
+	["char", "'\\u{0000}'"],
+	["char", "'\\u{1F648}'"],
+	["char", "'\\u{10FFFF}'"]
 ]
 
 ----------------------------------------------------
 
-Checks for chars.
+Checks for chars.