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iter remove-mut-var-assign.1: atomic removal of mut/var/assign

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mut/var/assign removed from AILang entirely and atomically. Deleted:
Term::Mut/Term::Assign/struct MutVar; the three Form-A keywords +
parse_mut/parse_assign + grammar EBNF; the 4 mut CheckError variants;
the mut_scope_stack synth threading (param dropped from synth + every
internal/external/test caller); the two lower_term arms; and every
exhaustive no-_ Term::Mut/Term::Assign match arm across 17 source
files — cut in lockstep with DESIGN.md, fixtures, the drift trio,
carve-out and roadmap so the schema is honest at every commit. No
catch-all wildcard introduced (verified). loop/recur + let/if are
the surviving forms.

The shared codegen alloca machinery survives (loop reuses it):
mut_var_allocas renamed binder_allocas (representation-only, loop
codegen byte-identical) and the shared Term::Lam escape guard
simplified to !loop_stack.is_empty() with the loop half
(LoopBinderCapturedByLambda) byte-equivalent. Feature-acceptance
applied inverted: the removed feature fails clause 2 (redundant)
and clause 3 (IS the iterated-mutable-state bug class).

Behaviour preservation is executable: mut_counter/mut_sum_floats
still print 55 after the faithful let/if rewrite. The removal is
made executable by the new mut_removed_pin.rs (4 must-fail pins).
Independent verification: cargo test --workspace 605/0, zero
residual mut symbols in any crate source, loop/recur non-regression
all green (55 / 500000500000 / infinite-compiles / the
lambda_capturing_loop_binder pin), roundtrip_cli PASS.

One DONE_WITH_CONCERNS: a 4th recurrence of the recon-undercount
class (in-source mod tests + a drift-pin fn + 5 orphaned mut
.ail.json carve-outs + a non-enumerated E0599); all resolved within
implementer remit, no behaviour change. Milestone-close audit then
fieldtest remain.

spec docs/specs/2026-05-18-remove-mut-var-assign.md (grounding PASS)
plan docs/plans/remove-mut-var-assign.1.md
This commit is contained in:
Brummel
2026-05-18 11:06:17 +02:00
parent f355899fdf
commit 07f080256c
48 changed files with 331 additions and 2523 deletions
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crates/ailang-core/src/workspace.rs
-23
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@@ -1247,18 +1247,6 @@ where
walk_term_embedded_types(source, f)?;
walk_term_embedded_types(body, f)
}
// Iter mut.1: each `MutVar.ty` is an embedded type — walk
// it. Then recurse into each var's `init` and the block's
// body. `Term::Assign` carries no embedded type; recurse
// into its `value` only.
Term::Mut { vars, body } => {
for v in vars {
walk_type(&v.ty, f)?;
walk_term_embedded_types(&v.init, f)?;
}
walk_term_embedded_types(body, f)
}
Term::Assign { value, .. } => walk_term_embedded_types(value, f),
Term::Loop { binders, body } => {
for b in binders {
walk_type(&b.ty, f)?;
@@ -1394,17 +1382,6 @@ where
walk_term(source, f)?;
walk_term(body, f)
}
// Iter mut.1: `Term::Ctor.type_name` is the only string this
// walker reports — mut-vars carry no Ctor-type strings. Just
// recurse into each var's `init` and the body, and into
// assign's `value`.
Term::Mut { vars, body } => {
for v in vars {
walk_term(&v.init, f)?;
}
walk_term(body, f)
}
Term::Assign { value, .. } => walk_term(value, f),
Term::Loop { binders, body } => {
for b in binders {
walk_term(&b.init, f)?;