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

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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
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8
examples/chronorift/overworld.ludic
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@ -37,13 +37,13 @@ handler Control phase Input {
if reg(R_MODE) == 0 {
for (p) in query [Pos, {Player}] {
let k = key()
let nx = p.x
let ny = p.y
var nx = p.x
var ny = p.y
if k == 'w' { ny = p.y - 1 }
if k == 's' { ny = p.y + 1 }
if k == 'a' { nx = p.x - 1 }
if k == 'd' { nx = p.x + 1 }
let moved = 0
var moved = 0
if walkable(nx, ny) {
if nx != p.x or ny != p.y {
p.x = nx
@ -88,7 +88,7 @@ handler Control phase Input {
set_reg(R_ENC, reg(R_ENC) - 1)
if reg(R_ENC) <= 0 {
set_reg(R_ENC, rng_range(4, 9))
let et = 0
var et = 0
if reg(R_MAP) == 1 { et = 1 }
if reg(R_MAP) == 0 {
if rng_chance(40) { et = 1 }