starting to wrap our ast copy in accessor functions, prefixed 'rf_..' Yes its boilerplaty OOP madness, but we suspect either the access we want *is* in rustc, or if not it will turn up - so we want a classic abstraction layer, easy to refactor out later when we know how to clean this up. The rust AST is going through changes aswell. We might be able to turn 'AstNode' into a cursor similar to libclang's accessor
moved toward refactorable find_ast_node ast accessors, cleanup..