enum NodeKind {
	NODE_FUNCTION,
	NODE_VAR_DECL,
	NODE_TYPEDEF,
	NODE_STRUCT,
	NODE_RETURN,
	NODE_BINARY_OP,
	NODE_LITERAL,
	NODE_IDENTIFIER,
	NODE_CALL,
	NODE_BLOCK,
}

struct ASTNode {
	NodeKind kind;
	union {
		FunctionNode fn;
		VarDeclNode var;
		TypedefNode td;
		StructNode str;
		ExprNode expr;
		BlockNode block;
	}
}

// Function
struct FunctionNode {
	String name;
	String return_type;
	List<VarDeclNode> params;
	BlockNode body;
	bool is_inline;
	bool is_static;
	bool is_export;
	bool is_extern;
	bool is_asm;
}

// Variable declaration
struct VarDeclNode {
	String name;
	String type;
	ExprNode* init; // optional
	bool is_raw;
}

// Block
struct BlockNode {
	List<ASTNode> statements;
}

// Typedef
struct TypedefNode {
	String alias;
	String type;
}

// Struct
struct StructNode {
	String name;
	List<VarDeclNode> fields;
}

// Expression
enum ExprKind {
	EXPR_LITERAL, EXPR_IDENTIFIER, EXPR_BINARY, EXPR_CALL, EXPR_CAST
}

struct ExprNode {
	ExprKind kind;
	union {
		LiteralNode lit;
		String ident;
		BinaryExprNode bin;
		CallExprNode call;
		CastExprNode cast;
	}
}

// Binary op
struct BinaryExprNode {
	String op;
	ExprNode* lhs;
	ExprNode* rhs;
}

// Function call
struct CallExprNode {
	String callee;
	List<ExprNode> args;
}

// Literal
struct LiteralNode {
	String value; // numeric, char, string
}