Allow matching preceding atom with zero-width (\@=)

test/basic.expected

@@ -336,6 +336,16 @@ my_object        .
   | batch_size | Fixnum  | nil     | number of maximum items to be assigned at once |
   | logger     | Logger  | nil     | logger instance for debug logs                 |
 
+
+```c
+
+const char*                          str    = "Hello";
+int64_t                              count  = 1 + 2;
+static double                        pi     = 3.14;
+static std::map<std::string, float>* scores = pointer;
+
+```
+
   |Option         |Type        |Default     |Description                                        |
   |--             |--          |--          |--                                                 |
   |threads        |Fixnum      |1           |number of threads in the thread pool               |