fix: check if neovim is nightly to load advanced hl

lua/solarized/colorscheme.lua

@@ -106,23 +106,25 @@ function Colorscheme:apply_semantic_hl()
     end,
   })
 
-  vim.api.nvim_create_autocmd('LspTokenUpdate', {
-    callback = function(args)
-      local token = args.data.token
+  if vim.fn.has 'nvim-0.9.0' == 1 then
+    vim.api.nvim_create_autocmd('LspTokenUpdate', {
+      callback = function(args)
+        local token = args.data.token
 
-      if token.type ~= 'variable' or token.modifiers.readonly then
-        return
-      end
+        if token.type ~= 'variable' or token.modifiers.readonly then
+          return
+        end
 
-      local text = vim.api.nvim_buf_get_text(args.buf, token.line, token.start_col, token.line, token.end_col, {})[1]
+        local text = vim.api.nvim_buf_get_text(args.buf, token.line, token.start_col, token.line, token.end_col, {})[1]
 
-      if text ~= string.upper(text) then
-        return
-      end
+        if text ~= string.upper(text) then
+          return
+        end
 
-      vim.lsp.semantic_tokens.highlight_token(token, args.buf, args.data.client_id, '@constant')
-    end,
-  })
+        vim.lsp.semantic_tokens.highlight_token(token, args.buf, args.data.client_id, '@constant')
+      end,
+    })
+  end
 end
 
 function Colorscheme:setup(t)
@@ -149,7 +151,7 @@ function Colorscheme:setup(t)
 
   self:apply_colorscheme_highlights()
 
-  if self.config.theme ~= 'vim' and vim.fn.has('nvim-0.8.3') then
+  if self.config.theme ~= 'vim' then
     self:apply_semantic_hl()
   end
 end