support @counter-style. Fixes #2204

lib/less/parser/parser.js

@@ -1290,6 +1290,10 @@ var Parser = function Parser(context, imports, fileInfo) {
                         hasBlock = true;
                         break;
                     */
+                    case "@counter-style":
+                        hasIdentifier = true;
+                        hasBlock = true;
+                        break;
                     case "@charset":
                         hasIdentifier = true;
                         hasBlock = false;

test/css/css-3.css

@@ -142,3 +142,8 @@ body ^^ .shadow {
 #issue2066 {
   background: url('/images/icon-team.svg') 0 0 / contain;
 }
+@counter-style triangle {
+  system: cyclic;
+  symbols: ‣;
+  suffix: " ";
+}

test/less/css-3.less

@@ -144,3 +144,8 @@ body ^^ .shadow {
 #issue2066 {
   background: url('/images/icon-team.svg') 0 0 / contain;
 }
+@counter-style triangle {
+  system: cyclic;
+  symbols: ‣;
+  suffix: " ";
+}