Brummel
ac9171ebf0
Pure simplification pass, no behaviour change — hashes, canonical forms, diagnostic codes, and emitted IR are byte-identical (hash-pin and IR-pin tests unchanged and green). ailang-check: - strip_forall and collect_pattern_binders were triplicated verbatim across linearity.rs / reuse_shape.rs / uniqueness.rs; hoisted each to a single pub(crate) fn in lib.rs. - mono.rs::pattern_binders was a fourth copy of collect_pattern_binders (iterative style, same result for every Pattern shape); deleted, now calls the shared fn. - maybe_instantiate and expect_eq were single-call wrappers; inlined at their sole call sites and removed. ailang-core: - collect_used_in_pattern was a verbatim duplicate of pattern_binds; deleted, call site repointed. pattern_binds made private (no external callers; the doc-comment's lift_letrecs claim was stale). - is_false serde helper replaced by std::ops::Not::not at the four skip_serializing_if sites (all plain-bool fields); helper removed. - test-only any_nested_ctor / any_let_rec folded into one generic any_term(t, &pred) walker. - removed dead test helpers tmp_dir / examples_dir, orphaned when their tests relocated to tests/workspace_pin.rs. ailang-codegen: - removed the write-only Emitter::types field, its populating loop, and the now-unused CtorInfo struct it fed. - adt_drop_symbol / adt_partial_drop_symbol differed only in a prefix literal; folded into one adt_symbol(prefix, ...). Symbol strings unchanged. Net -180 LOC.