chore: update ROADMAP.md

Author: StunxFS

ROADMAP.md

@@ -1,7 +1,8 @@
 ## Roadmap - Self-hosted compiler
 
 - [X] Check correct implementation of a trait.
-- [ ] `no_mangle` attribute.
+- [ ] `no_mangle` attribute to avoid function mangling.
+- [ ] `c_union` attribute to indicate that a struct should behave the same as a C union.
 - [ ] Format command (`rivet fmt .`).
 - [ ] Replace Python scripts with Rivet scripts.
 - [ ] Explicit function/method overloading:
@@ -19,13 +20,13 @@
 - [ ] Constant-folding: `x := 2 * 2;` => `x := 4;`.
 - [ ] Optimize code, inline functions/methods annotated with `inline`, 
     delete unused code, etc.
-- [ ] (Atomic) Reference-Counting for traits, boxed enums, strings and vectors.
+- [ ] (Atomic) Reference-Counting for traits, boxed enums, strings, vectors and structs.
 - [ ] Better support for embedded structs.
 - [ ] `undefined` for uninitialized variables: `x: [5]uint8 := undefined;`.
 - [ ] Disallow empty array literal (`x := []!; -> ERROR`).
 - [ ] Add `@is_flag_defined()` builtin function.
 - [ ] Generic support: `Struct<T> { f: T; }` => `Struct:<T>(f: @default(T))`.
-- [ ] Lambdas + Closures: `sum := |a: int32, b: int32| a + b;`.
+- [ ] Lambdas + Closures: `sum := |a: int32, b: int32| [my_inherited_var] a + b;`.
 - [ ] Anonymous structs: `my_obj := struct(my_field: 1, other_field: true, pwd: "abc");`.
 - [ ] `extern (C) import` for C interop:
     ```swift
@@ -40,14 +41,15 @@
 
     func xyz() { }
     ```
+- [ ] Replace `c/libc` definitions by `extern (C) import` declarations.
 - [ ] `comptime` statement for compile-time execution (`CTE`):
     ```swift
     comptime {
         my_func();
     }
 
     func my_func() {
-        console.println("executed in compile-time");
+        console.writeln("executed in compile-time");
     }
     ```
-- [ ] Replace `c/libc` definitions by `extern (C) import` declarations.
+