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Unit 3 of the python migration architectural plan (docs/plans/2026-04-19-001-refactor-python-migration-architectural-plan.md). Wires the `def get_user() -> User` return-type annotation into the typeBindings stream so the existing constructor-inferred + transitive chain machinery can resolve `u = get_user(); u.save()` to `User#save` without any orchestrator change. Changes: - `query.ts` + `scopes.scm`: new `@type-binding.return` pattern keyed by the function name (matches RFC §5.1 canonical vocabulary). - `interpret.ts`: maps `@type-binding.return` to the existing `'return-annotation'` source label (no shared change needed). - `scope-extractor.ts pass4CollectTypeBindings`: extends the Pass 2 auto-hoist (anchor range == innermost scope range → bind in parent) to type bindings as well — return-type bindings whose anchor IS the function_definition land in the function's enclosing scope so callers see them. Same-file return-type inference is now end-to-end: `def get_user() -> User: ...` + `u = get_user()` produces `u: User (return-annotation)` in the caller's scope via `followChainedRef`. Verification: - Flag-off: 191/191 (identical baseline). - Flag-on: 31 fail / 160 pass (no change — every remaining return-type test in this fixture set is *cross-file*; carrying `get_user → User` across module boundaries lands with the cross-file typeBinding propagation work in Unit 5/7). - tsc --noEmit clean. |
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