Add coverage for generic attributes

Author: damieng

README.md

@@ -51,7 +51,7 @@ Comprehensive supports C# 1 through 10.0 with the following exceptions:
 
 #### C# 11.0 (under development)
 
-- [ ] Generic attributes
+- [x] Generic attributes
 - [x] Static abstract members in interfaces
 - [x] Newlines in string interpolations
 - [ ] List patterns

corpus/attributes.txt

@@ -315,4 +315,22 @@ void A() { }
       (void_keyword)
       (identifier)
       (parameter_list)
+      (block))))
+
+=======================================
+Generic attribute
+=======================================
+[Theory<About,Life>]
+void A() { }
+
+---
+
+(compilation_unit
+  (global_statement
+    (local_function_statement
+      (attribute_list
+        (attribute (generic_name (identifier) (type_argument_list (identifier) (identifier)))))
+      (void_keyword)
+      (identifier)
+      (parameter_list)
       (block))))