Orkuncakilkaya
e1d7797e29
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>
13 lines
535 B
Text
13 lines
535 B
Text
program T {
|
|
fn fib(n: int) -> int { if n < 2 { return n }; return fib(n-1) + fib(n-2) }
|
|
entry {
|
|
print_int(fib(10)) # 55
|
|
var s = 0
|
|
for i in 0 .. 10 { if i == 5 { break }; if i % 2 == 0 { continue }; s = s + i }
|
|
print_int(s) # 1+3 = 4
|
|
var i = 0; var t = 0
|
|
while true { i = i + 1; if i > 5 { break }; t = t + i }
|
|
print_int(t) # 15
|
|
if false and (1/0 == 0) { print_int(999) } else { print_int(1) } # short-circuit: no div by zero
|
|
}
|
|
}
|