Brummel
90075715d9
plan: mq.3 — MethodNameCollision retirement + multi-class E2E + DESIGN.md sync, 9 tasks
Three out-of-band corrections precede the retirement (from mq.2
known debt):
- T1: Env.active_declared_constraints field populated by check_fn
pre-synth — enables resolve_method_dispatch's constraint-driven
filter at synth time for rigid-var fallback.
- T2: class_methods re-keyed to (QualifiedClassName, MethodName)
tuple — post-retirement multiple classes can declare same-named
methods. Mono's presence-check switches to
method_to_candidate_classes (method-keyed natively).
- T3: synth(...) signature extended with warnings: &mut Vec<Diagnostic>
out-parameter; resolution ladder reordered so fn wins precedence
matches spec §Class-fn collisions; class-method-shadowed-by-fn
warning fires when both branches would have matched.
Retirement (T4-T5):
- Delete MethodNameCollision variant + Origin enum + pre-pass +
Display arm.
- Relocate the two pin tests to crates/ailang-check/tests/method_collision_pin.rs
(cross-crate needed for Env.method_to_candidate_classes access);
invert assertions to "loads clean + candidates populated".
E2E (T6) — three new positive fixtures:
- mq3_two_show_ambiguous: two Show classes both with Show Int →
AmbiguousMethodResolution.
- mq3_two_show_qualified: same workspace + explicit qualifier →
clean resolve.
- mq3_class_eq_vs_fn_eq: class MyEq + fn myeq → fn wins + shadow warning.
Docs (T7-T8):
- DESIGN.md: strike MethodNameCollision; reword AmbiguousInstance
paragraph (per-class coherence stays; cross-class ambiguity is new);
new §Method dispatch subsection anchors the 5-step rule.
- Roadmap: P2 entry → [x]; milestone 24 depends-on cleared.
WhatsNew is milestone-close (after audit), NOT mq.3.
Boss decisions on recon's 6 open questions:
- class_methods shape: tuple key (a).
- Warning channel: synth out-parameter (a).
- declared_constraints: post-superclass-expansion on Env.
- Pin test location: relocate to ailang-check tests.
- AmbiguousInstance paragraph: reword, don't delete.
- Operator-=/< corner: out of scope (prelude ne/lt are free fns).
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