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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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6
selfhost/emit_head.ludic
View file

@ -10,7 +10,7 @@ fn emit_str_const(s: ptr) -> ptr {
let n = slen(s)
emith(name); emith(" = private unnamed_addr constant [")
emith(itoa(n + 1)); emith(" x i8] c\"")
let i = 0
var i = 0
while i < n {
let c = peek8(s, i)
if c == 34 or c == 92 or c < 32 or c > 126 {
@ -79,13 +79,13 @@ fn emit_header() -> void {
# property layouts — a %Cmp_ record of named fields, emitted here so `new`
# works whether or not the program runs the ECS. The per-entity @S_/@H_ arrays
# are separate (emit_ecs_storage), emitted only for a program that runs the ECS.
let i = 0
var i = 0
while i < len(prog) {
let d = prog[i]
if d.kind == N_COMP {
emith(layout_ty(d.s)); emith(" = type { ")
if len(d.kids) == 0 { emith("i32") }
let f = 0
var f = 0
while f < len(d.kids) {
if f > 0 { emith(", ") }
emith(llty(d.kids[f].ty))