struct Lex_Stream {
    String stream;
    S64 iter;

    U8 *line_begin;
    Intern_String file;
    S32 line;
    S32 inside_brace_paren;
    Array<Token *> indent_stack; // @scratch_allocated
};

struct Core_Ctx {
    Allocator *heap;

    Arena perm_push_only;
    Arena *perm; // Stores: AST, tokens, interns

    Arena *scratch;
    Arena scratch_;
    Arena stage_arena_;
    Arena *stage_arena;
    Arena token_arena;
    String_Builder helper_builder;

    int errors_occured;
    int warnings_occured;
    Core_Message *first_message;
    Core_Message *last_message;

    // Lexer stuff
    Lex_Stream stream;
    Array<Token> tokens;
    Intern_Table interns;
    S64 token_iter;
    U32 token_debug_ids;

    // Types
    List<Ast_Type *> all_types;
    S32 type_ids;
    int global_decl_ids;
    U64 unique_ids; // @Debug
    Map type_map;

    Ast_Module *custom_module;
    Ast_Module *language_base_module;

    List<Ast_File *> files;
    List<Ast_Module *> modules;
    List<Ast_Decl *> ordered_decls;
    S32 base_language_ordered_decl_len;

    Ast_Scope *currently_parsed_scope;
    Ast_File *currently_parsed_file;
    U32 scope_ids;
    U32 scope_visit_id;

    List<String> module_folders;
    String module_folder;
    String exe_folder;
    String working_folder;
    List<Token *> files_to_link;

    struct {
        F64 typechecking;
        F64 code_generation;
        F64 total;
        F64 init_context;
        F64 parsing;

        F64 start;
    } time;
    int lines_lexed;

    bool debugger_break_on_compiler_error;

    // Codegen stage mostly
    S64 indent;
    String_Builder gen;

    // Codegen stage configurables
    bool emit_line_directives;
    bool emit_type_info;
    bool single_header_library_mode;
    String single_header_library_name;

    Token same_scope_token;
    Token null_token;

    /*#import meta
for i in meta.keywords: print(f'Intern_String keyword_{i.lower()};')
for i in meta.interns: print(f'Intern_String intern_{i.lower()};')
    */
    Intern_String keyword_struct;
    Intern_String keyword_union;
    Intern_String keyword_true;
    Intern_String keyword_default;
    Intern_String keyword_continue;
    Intern_String keyword_break;
    Intern_String keyword_false;
    Intern_String keyword_return;
    Intern_String keyword_switch;
    Intern_String keyword_assert;
    Intern_String keyword_if;
    Intern_String keyword_elif;
    Intern_String keyword_pass;
    Intern_String keyword_else;
    Intern_String keyword_for;
    Intern_String keyword_enum;
    Intern_String intern_typeof;
    Intern_String intern_sizeof;
    Intern_String intern_len;
    Intern_String intern_alignof;
    Intern_String intern_foreign;
    Intern_String intern_strict;
    Intern_String intern_void;
    Intern_String intern_flag;
    Intern_String intern_it;
    Intern_String intern_load;
    Intern_String intern_import;
    Intern_String intern_link;
    Intern_String intern_compiler_breakpoint;
    /*END*/

    /*#import meta
size = 0
for i in meta.token_simple_expr:
  if i[1] != "SPECIAL":
    size += 1
print(f"Ast_Operator_Info op_info_table[{size}];")
  */
    Ast_Operator_Info op_info_table[20];
    /*END*/

    Ast_Type type__void;
    Ast_Type type__string;
    Ast_Type type__bool;
    Ast_Type type__type;

    Ast_Type type__f32;
    Ast_Type type__f64;

    Ast_Type type__s8;
    Ast_Type type__s16;
    Ast_Type type__s32;
    Ast_Type type__s64;

    Ast_Type type__u8;
    Ast_Type type__u16;
    Ast_Type type__u32;
    Ast_Type type__u64;

    Ast_Type type__untyped_bool;
    Ast_Type type__untyped_int;
    Ast_Type type__untyped_string;
    Ast_Type type__untyped_float;

    Ast_Type type__char;
    Ast_Type type__uchar;
    Ast_Type type__int;
    Ast_Type type__uint;
    Ast_Type type__long;
    Ast_Type type__ulong;
    Ast_Type type__llong;
    Ast_Type type__ullong;
    Ast_Type type__short;
    Ast_Type type__ushort;

    Ast_Type *type_char;
    Ast_Type *type_uchar;
    Ast_Type *type_int;
    Ast_Type *type_uint;
    Ast_Type *type_long;
    Ast_Type *type_ulong;
    Ast_Type *type_llong;
    Ast_Type *type_ullong;
    Ast_Type *type_short;
    Ast_Type *type_ushort;

    Ast_Type *type_void;

    Ast_Type *type_pointer_to_char;
    Ast_Type *type_pointer_to_void;
    Ast_Type *type_any; // Needs to be inited at runtime

    Ast_Type *type_type;
    Ast_Type *type_string;
    Ast_Type *type_bool;

    Ast_Type *type_f32;
    Ast_Type *type_f64;

    Ast_Type *type_s8;
    Ast_Type *type_s16;
    Ast_Type *type_s32;
    Ast_Type *type_s64;

    Ast_Type *type_u8;
    Ast_Type *type_u16;
    Ast_Type *type_u32;
    Ast_Type *type_u64;

    Ast_Type *untyped_string;
    Ast_Type *untyped_bool;
    Ast_Type *untyped_int;
    Ast_Type *untyped_float;

    Ast_Type type__vargs;
    Ast_Type *type_vargs;

    Intern_String intern(String string) {
        assert(string.len > 0);
        return intern_string(&interns, string);
    }

    Intern_String internf(char *str, ...) {
        STRING_FMT(this->stage_arena, str, result);
        return intern_string(&interns, result);
    }

    String fmt(char *str, ...) {
        STRING_FMT(this->stage_arena, str, result);
        return result;
    }
};

CORE_Static String compile_to_c_code();
CORE_Static Ast_Module *ast_module(Token *pos, Intern_String filename);
CORE_Static void insert_builtin_types_into_scope(Ast_Scope *p);
CORE_Static void insert_into_scope(Ast_Scope *scope, Ast_Decl *decl);
CORE_Static Ast_Type *type_incomplete(Ast *ast);
CORE_Static Ast_Expr *parse_expr(S64 minbp = 0);