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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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24
runtime/native/inflate.ludic
View file

@ -30,7 +30,7 @@ fn z_start(src: ptr, len: int) -> void {
}
fn z_bits(need: int) -> int {
let val = z_bitbuf
var val = z_bitbuf
while z_bitcnt < need {
if z_pos >= z_len {
z_err = 1
@ -79,9 +79,9 @@ fn z_table_build(table: ptr, lengths: ptr, n: int) -> void {
}
fn z_decode(table: ptr) -> int {
let code = 0
let first = 0
let index = 0
var code = 0
var first = 0
var index = 0
for len in 1 .. 16 {
code = bor(code, z_bits(1))
let count = peek32(table, len)
@ -131,7 +131,7 @@ fn z_stored(out: ptr, at: int, cap: int) -> int {
if z_pos + 4 > z_len { return -1 }
let n = peek8(z_src, z_pos) + shl(peek8(z_src, z_pos + 1), 8)
z_pos = z_pos + 4 # LEN then its one's complement
let w = at
var w = at
for i in 0 .. n {
if z_pos >= z_len { return -1 }
if w >= cap { return -1 }
@ -143,8 +143,8 @@ fn z_stored(out: ptr, at: int, cap: int) -> int {
}
fn z_codes(out: ptr, at: int, cap: int, lit: ptr, dist: ptr) -> int {
let w = at
let sym = z_decode(lit)
var w = at
var sym = z_decode(lit)
while sym != 256 {
if z_err != 0 { return -1 }
if sym < 0 { return -1 }
@ -202,7 +202,7 @@ fn z_dynamic_tables(lit: ptr, dist: ptr) -> int {
let clen = z_table_new(19)
z_table_build(clen, lengths, 19)
let n = 0
var n = 0
while n < nlen + ndist {
let sym = z_decode(clen)
if sym < 0 { return 0 }
@ -211,8 +211,8 @@ fn z_dynamic_tables(lit: ptr, dist: ptr) -> int {
n = n + 1
}
if sym >= 16 {
let prev = 0
let rep = 0
var prev = 0
var rep = 0
if sym == 16 {
if n == 0 { return 0 }
prev = peek32(lengths, n - 1)
@ -244,8 +244,8 @@ fn z_inflate(src: ptr, len: int, out: ptr, cap: int) -> int {
z_start(src, len)
let lit = z_table_new(288)
let dist = z_table_new(30)
let w = 0
let final = 0
var w = 0
var final = 0
while final == 0 {
final = z_bits(1)
let btype = z_bits(2)