A decent union type with common fields and variants

code/demo.odin

@@ -7,12 +7,102 @@
 #import "os.odin";
 // #import "halloc.odin";
 
+Token_Kind :: enum {
+}
+Token_Pos :: struct {
+	file:   string,
+	line:   int,
+	column: int,
+}
+Token :: struct {
+	kind:      Token_Kind,
+	name:      string,
+	using pos: Token_Pos,
+}
+
+Exact_Value :: union {
+	Boolean {b: bool},
+	String  {s: string},
+	Integer {i: i64},
+	Float   {f: f64},
+	Pointer {p: i64},
+	Compound{c: rawptr},
+}
+Overload_Kind :: enum {
+	UNKNOWN,
+	NO,
+	YES,
+}
+Scope :: struct {
+	parent:                  ^Scope,
+	prev, next:              ^Scope,
+	first_child, last_child: ^Scope,
+	elements:                map[string]^Entity,
+	implicit:                map[^Entity]bool,
+
+	shared:                  [dynamic]^Scope,
+	imported:                [dynamic]^Scope,
+	is_proc:                 bool,
+	is_global:               bool,
+	is_file:                 bool,
+	is_init:                 bool,
+	has_been_imported:       bool, // This is only applicable to file scopes
+	file:                    rawptr,
+}
+
+Type :: struct {
+}
+
+Entity :: union {
+// Common Fields
+	flags:        u32,
+	using token:  Token,
+	scope:        ^Scope, // Parent's scope
+	type:         ^Type,
+	// identifier:   ^ast.Node,
+
+	using_parent: ^Entity,
+	// using_expr:   ^ast.Node,
+
+// Variants
+	Constant{value: Exact_Value},
+	Variable{
+		field_index, field_src_index:  int,
+		is_immutable, is_thread_local: bool,
+	},
+	Type_Name{},
+	Procedure{
+		is_foreign:      bool,
+		foreign_name:    string,
+		foreign_library: ^Entity,
+		link_name:       string,
+		tags:            u64,
+		overload_kind:   Overload_Kind,
+	},
+	Builtin{id: int},
+	Import_Name{
+		import_path:  string,
+		import_name:  string,
+		import_scope: ^Scope,
+		used:         bool,
+	},
+	Library_Name{
+		library_path: string,
+		library_name: string,
+		used:         bool,
+	},
+	Nil{},
+}
+
 main :: proc() {
-	m: map[int]int;
-	m[123] = 312;
-	fmt.println(m[123]);
-	delete(m, 123);
-	fmt.println(m[123]);
+	e: Entity;
+	u := union_cast(^Type_Info.Union)type_info_base(type_info_of_val(e));
+
+
+	fmt.println(type_info_base(type_info(Entity)));
+
+
+	// e.flags = 123;
 
 
 /*