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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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10
selfhost/emit_expr.ludic
View file

@ -57,7 +57,7 @@ fn emit_bin(e: Node) -> Val {
let b = emit_expr(e.b)
let fx = streq(a.ty, "fixed") or streq(b.ty, "fixed")
if is_cmp(e.s) {
let ac = a.code; let bc = b.code
var ac = a.code; var bc = b.code
if fx { ac = to_fixed(a); bc = to_fixed(b) }
let c = emit_bind(sconcat("icmp ", sconcat(cmp_code(e.s), sconcat(" i32 ", sconcat(ac, sconcat(", ", bc))))))
return val(emit_bind(sconcat("zext i1 ", sconcat(c, " to i32"))), "bool")
@ -100,8 +100,8 @@ fn emit_call(e: Node) -> Val {
if is_intrinsic(name) { return emit_intrinsic(name, e) }
if is_intrinsic2(name) { return emit_intrinsic2(name, e) }
if is_math_builtin(name) { return emit_math_builtin(name, e) }
let fn2 = find_fn(name)
let cname = name
var fn2 = find_fn(name)
var cname = name
if ptr_is_null(fn2) {
# a builtin like clear()/reg() is satisfied by its rt_ function
let rtname = sconcat("rt_", name)
@ -112,11 +112,11 @@ fn emit_call(e: Node) -> Val {
# evaluate args first (their IR is emitted before the call instruction)
let args = new []ptr
let atys = new []ptr
let i = 0
var i = 0
while i < len(e.kids) { let v = emit_expr(e.kids[i]); push(args, v.code); push(atys, v.ty); i = i + 1 }
let rl = llty(fn2.ty)
emit(" ")
let rreg = "0"
var rreg = "0"
if not streq(rl, "void") { rreg = nreg(); emit(rreg); emit(" = ") }
emit("call "); emit(rl); emit(" @fn_"); emit(cname); emit("(")
i = 0