workshopsoft/ludic
2
0
Fork 0
Code Issues Pull requests Projects Releases 26 Packages Wiki Activity Actions

Phase 6f: let = immutable, var = mutable (binding-only)

Browse source 
Bindings now signal mutability the way Rust/Swift do, instead of `let` meaning
"local" and `var` meaning "module-level":

  - `let x = e`  -> immutable binding; a later `x = …` is a compile error
    (`cannot assign to immutable 'x' … use var`).
  - `var x = e`  -> mutable binding, at local OR module scope (position decides
    scope; the keyword decides mutability).
  - `const`      -> unchanged (compile-time).

Immutability is of the *binding*, not the object: `let n = new Node; n.kind = 1`
is fine (mutation through the reference); only rebinding `n` is rejected. The
check lives in emit_assign — a direct `name =` whose target is a `let` local
(loc_mut == 0) errors; field/index targets and `var`/param/loop bindings are
unaffected.

Delivered as three reseeds so the self-hosting compiler never had to compile
source its own rules would reject:
  A) add `var` as a local statement + per-local mutability tracking (loc_mut),
     no enforcement;
  B) migrate every reassigned `let` -> `var` across the compiler, runtime and
     examples (337 declarations), driven by a per-function, string/comment-aware
     scan (binding targets only, never `x.f =` / `x[i] =`);
  C) turn on the check. bootstrap-cfree (compiler vs its own source) and every
     golden build (which splices the runtime) then proved zero reassigned `let`
     was missed anywhere.

Also folded in: removed leftover debug instrumentation in block() (a `cur=` /
print_int(777…) trace on the separator-error path) and fixed parse.ludic's stale
header comment (no more `struct`). Reseeded (21711 lines); C-free fixpoint holds;
goldens identical; 17/17; vocab + doc-fences clean.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Orkun ÇAKILKAYA 2026-08-27 23:52:59 +03:00
parent 573813609c
commit e1d7797e29
38 changed files with 2909 additions and 2778 deletions
Download patch file Download diff file Expand all files Collapse all files

6
examples/lib/combat.ludic
View file

@ -17,7 +17,7 @@ program Combat {
# damage after armour, with a crit multiplier applied on an exact roll
@export fn damage(attack: int, armour: int, roll: int) -> int {
let raw = attack - armour
var raw = attack - armour
if raw < 1 { raw = 1 }
if roll == 20 { raw = raw * CRIT_MULT }
return raw
@ -26,8 +26,8 @@ program Combat {
# how many hits to drop a target — the loop is here so the caller cannot
# accidentally disagree with `damage` about rounding
@export fn hits_to_kill(hp: int, attack: int, armour: int) -> int {
let left = hp
let n = 0
var left = hp
var n = 0
while left > 0 {
left = left - damage(attack, armour, 0)
n = n + 1