The weird thing about C is the syntax does not clearly identify which tokens refer to types and which tokens refer to other things. A statement like `myint x` i

The weird thing about C is the syntax does not clearly identify which tokens refer to types and which tokens refer to other things. A statement like `myint x` is only a variable declaration if `myint` is a type, which means in order to identify a variable declaration, you have to know the complete set of named types, so constructing an AST requires keeping track of types.