Ruby: Ensure module syntax is not confused with symbols. Fix #1336

Author: Golmote

components/prism-ruby.js

@@ -69,7 +69,10 @@
 			}
 		],
 		'variable': /[@$]+[a-zA-Z_]\w*(?:[?!]|\b)/,
-		'symbol': /:[a-zA-Z_]\w*(?:[?!]|\b)/
+		'symbol': {
+			pattern: /(^|[^:]):[a-zA-Z_]\w*(?:[?!]|\b)/,
+			lookbehind: true
+		}
 	});
 
 	Prism.languages.insertBefore('ruby', 'number', {

components/prism-ruby.min.js

@@ -0,0 +1,15 @@
+:Foo
+Foo::Bar
+
+----------------------------------------------------
+
+[
+	["symbol", ":Foo"],
+	["constant", "Foo"],
+	["punctuation", ":"], ["punctuation", ":"],
+	["constant", "Bar"]
+]
+
+----------------------------------------------------
+
+Ensures module syntax is not confused with symbols. See #1336