parse turbofish patterns (#254)

* parse turbofishes in patterns

* chore: generate

Author: m4rch3n1ng

grammar.js

@@ -1341,6 +1341,7 @@ module.exports = grammar({
       alias(choice(...primitiveTypes), $.identifier),
       $.identifier,
       $.scoped_identifier,
+      $.generic_pattern,
       $.tuple_pattern,
       $.tuple_struct_pattern,
       $.struct_pattern,
@@ -1358,6 +1359,15 @@ module.exports = grammar({
       '_',
     ),
 
+    generic_pattern: $ => seq(
+      choice(
+        $.identifier,
+        $.scoped_identifier,
+      ),
+      '::',
+      field('type_arguments', $.type_arguments),
+    ),
+
     tuple_pattern: $ => seq(
       '(',
       sepBy(',', choice($._pattern, $.closure_expression)),