Fix recognizing arguments shorthand

lib/rouge/lexers/livescript.rb

@@ -72,6 +72,13 @@ def self.loop_control_keywords
           push :id
         end
 
+        # operators
+        rule %r(
+          [+][+]|--|&&|\b(and|x?or|is(nt)?|not)\b(?!-[a-zA-Z]|_)|[|][|]|
+          [.]([|&^]|<<|>>>?)[.]|\\(?=\n)|[.:]=|<<<<?|<[|]|[|]>|
+          (<<|>>|==?|!=?|[-<>+*%^/~?])=?
+        )x, Operator, :slash_starts_regex
+
         # instance attributes
         rule %r/(@)(#{id})/ do
           groups Name::Variable::Instance, Name::Attribute
@@ -90,13 +97,6 @@ def self.loop_control_keywords
           groups Name::Builtin, Name::Attribute
         end
 
-        # operators
-        rule %r(
-          [+][+]|--|&&|\b(and|x?or|is(nt)?|not)\b(?!-[a-zA-Z]|_)|[|][|]|
-          [.]([|&^]|<<|>>>?)[.]|\\(?=\n)|[.:]=|<<<<?|<[|]|[|]>|
-          (<<|>>|==?|!=?|[-<>+*%^/~?])=?
-        )x, Operator, :slash_starts_regex
-
         # switch case
         rule %r/[|]|\bcase(?=\s)/, Keyword, :switch_underscore
 

spec/visual/samples/livescript

@@ -79,6 +79,9 @@ c = ^^...[copy, these, {}]
 delete ...list[1, 2, 3]
 do ...[a, b, c]
 
+# arguments shorthand &
+-> &1 + &2 || &a + &b || &
+
 # Imports
 obj = {one: 1, two: 2}
 obj <<< three: 3