clox | Bytecode Lox virtual machine , implemeneted in C for http | Bytecode library

I found myself calling lots of methods whose first argument is a complex object from a given class. Whilst with-slots and with-accessors are useful, generic methods cannot be bound in this way. So I thought: if we could locally curry any functions, slots + accessors + generic functions + functions could all be addressed with the same construct.

Example of code I want to clean up:

I am studying on how to make a bytecode interpreter (the language i am studing is clox at the site https://craftinginterpreters.com/). In it a valid clox program is defined as a list of declarations. A declaration is defined as either a class, function or variable declaration OR as a statement.

Now in C, i know there are different kinds of declarations and there are different kinds of statements but none of the types of declarations are a statement and none of the type of statements are a declaration. I think any possible line of C code is either one or the other so how do the standard define a C program ?

A list of lines that can be either a definition or a statement ?