Add ast::node and handle<T*, Error> comparison

And parser test for literals fingerscrossed
This commit is good, innit? But there will also be second one, and dessert

Signed-off-by: CHatingPython <chatingpython@gmail.com>

.clang-tidy

@@ -27,7 +27,8 @@ Checks: >
   -cppcoreguidelines-pro-bounds-constant-array-index,
   -cppcoreguidelines-macro-usage,
   -cppcoreguidelines-owning-memory,
-  -cppcoreguidelines-non-private-member-variables-in-classes
+  -cppcoreguidelines-non-private-member-variables-in-classes,
+  -cppcoreguidelines-pro-bounds-avoid-unchecked-container-access
 
 WarningsAsErrors: "*"