Fix to throw error on file

Closes GH-20.

Author: wooorm

lib/index.js

@@ -64,7 +64,7 @@ export default function rehypeHighlight(options = {}) {
     name = pos > -1 ? prefix.slice(0, pos) : prefix
   }
 
-  return (tree) => {
+  return (tree, file) => {
     // eslint-disable-next-line complexity
     visit(tree, 'element', (node, _, givenParent) => {
       const parent = /** @type {Node?} */ (givenParent)
@@ -108,7 +108,7 @@ export default function rehypeHighlight(options = {}) {
       } catch (error) {
         const exception = /** @type {Error} */ (error)
         if (!ignoreMissing || !/Unknown language/.test(exception.message)) {
-          throw error
+          file.fail(exception, node, 'rehype-highlight:missing-language')
         }
 
         return