workshopsoft/ludic
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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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20
runtime/native/ui.ludic
View file

@ -196,7 +196,7 @@ fn ui_tw(font: int, s: ptr, size: int) -> int {
if font >= 0 {
if font < tt_n { return rt_text_w(font, s, size) }
}
let n = 0
var n = 0
while peek8(s, n) != 0 { n = n + 1 }
return n * 6 * max(size / 8, 1)
}
@ -219,7 +219,7 @@ fn ui_dir(t: int) -> int {
return 1
}
fn ui_under(i: int, root: int) -> bool {
let k = i
var k = i
while k >= 0 {
if k == root { return true }
k = peek32(ui_parent, k)
@ -229,7 +229,7 @@ fn ui_under(i: int, root: int) -> bool {
# ---- measure: content sizes, children before parents ----------------------
fn ui_measure() -> void {
let i = ui_n - 1
var i = ui_n - 1
while i >= 0 {
if peek32(ui_visible, i) == 0 {
poke32(ui_rw, i, 0)
@ -237,8 +237,8 @@ fn ui_measure() -> void {
} else {
let t = peek32(ui_type, i)
let pad = peek32(ui_pad, i)
let cw = 0
let ch = 0
var cw = 0
var ch = 0
if t == WT_LABEL { cw = 0 - 1 }
if t == WT_BUTTON { cw = 0 - 1 }
if cw == 0 - 1 {
@ -262,9 +262,9 @@ fn ui_measure() -> void {
ch = peek32(ui_h, i)
} else {
let dir = ui_dir(t)
let mainsz = 0
let cross = 0
let nc = 0
var mainsz = 0
var cross = 0
var nc = 0
for c in 0 .. ui_n {
if peek32(ui_parent, c) == i {
if peek32(ui_visible, c) == 1 {
@ -292,8 +292,8 @@ fn ui_measure() -> void {
}
}
}
let rw = peek32(ui_w, i)
let rh = peek32(ui_h, i)
var rw = peek32(ui_w, i)
var rh = peek32(ui_h, i)
if rw == 0 { rw = cw }
if rh == 0 { rh = ch }
poke32(ui_rw, i, rw)