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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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18
selfhost/str.ludic
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@ -3,7 +3,7 @@
# byte buffers reached with peek8/poke8.
fn streq(a: ptr, b: ptr) -> bool {
let i = 0
var i = 0
while true {
let ca = peek8(a, i)
let cb = peek8(b, i)
@ -15,7 +15,7 @@ fn streq(a: ptr, b: ptr) -> bool {
}
fn slen(s: ptr) -> int {
let n = 0
var n = 0
while peek8(s, n) != 0 { n = n + 1 }
return n
}
@ -23,7 +23,7 @@ fn slen(s: ptr) -> int {
# a fresh NUL-terminated copy of src[start .. start+n]
fn substr(src: ptr, start: int, n: int) -> ptr {
let b = mem_alloc(n + 1)
let i = 0
var i = 0
while i < n { poke8(b, i, peek8(src, start + i)); i = i + 1 }
poke8(b, n, 0)
return b
@ -40,18 +40,18 @@ fn char_is_alnum(c: int) -> bool { return char_is_alpha(c) or char_is_digit(c) }
# integer -> fresh decimal string
fn itoa(v: int) -> ptr {
if v == 0 { let z = mem_alloc(2); poke8(z, 0, 48); poke8(z, 1, 0); return z }
let neg = false
let x = v
var neg = false
var x = v
if x < 0 { neg = true; x = 0 - x }
let tmp = mem_alloc(16)
let n = 0
var n = 0
while x > 0 { poke8(tmp, n, 48 + x % 10); x = x / 10; n = n + 1 }
let total = n
var total = n
if neg { total = total + 1 }
let out = mem_alloc(total + 1)
let k = 0
var k = 0
if neg { poke8(out, 0, 45); k = 1 }
let i = 0
var i = 0
while i < n { poke8(out, k + i, peek8(tmp, n - 1 - i)); i = i + 1 }
poke8(out, total, 0)
return out