mir.5 is the typed-MIR milestone's closing iteration. Its CODE half had
already converged before the iteration began, so mir.5 ships no code —
it ratifies into the design/ ledger the boundary the code already holds.
Verified at iteration entry (empirically, not from the spec sketch):
- all four named re-derivers grep-clean in codegen: synth_with_extras,
synth_arg_type, type_home_module, the second infer_module_with_cross;
- lower_workspace takes &MirWorkspace (codegen consumes MIR);
- MTerm::New is unreachable!() — raw-buf.4 desugars Term::New to
(app T.new …) before codegen, so there is no element-type
re-derivation left to relocate;
- #51 / #53 (the element-type / new-T codegen crashes) are closed;
their residue was fixed by ee4107c / 420f75f plus the New-desugar,
not by a separate raw-buf patch track.
Ledger work (the mir.5 deliverable):
- NEW design/contracts/0018-check-codegen-boundary.md: the invariant
"codegen re-derives nothing; MIR is total over what check proved;
a codegen arm that recomputes a fact instead of reading MIR is
drift." Ratifier: lower_to_mir_ty.rs::callee_classification_builtin_and_static.
- 0013-typeclasses invariant 2 retracted: codegen no longer re-resolves
cross-module names via an import_map fallback; lower_to_mir::classify_callee
resolves the reference once into Callee::Static and codegen consumes it.
- 0003-pipeline.md: the "lower to MIR" line names the real stage
(elaborate_workspace → MirWorkspace → lower_workspace) and a new
paragraph states the boundary, cross-referencing 0018.
- INDEX.md: boundary contract row added; qualified-xref re-pointed at
lower_to_mir + 0018.
- codegen_import_map_fallback_pin.rs doc-comment made honest — it pins
the post-mono AST precondition classify_callee relies on, not a
codegen-side resolution that no longer exists. Assertions unchanged;
the test stays green.
- spec 0060 gains a mir.5 refinement note recording the early code
convergence.
Acceptance criteria 1-7 of docs/specs/0060-typed-mir.md are all met.
Full workspace suite green (exit 0, 0 failed, 2 ignored); 708 passed
carried from mir.4 (no test added or removed).
Not done here (deliberately): the milestone #7 (raw-buf) subsumption
note is an external Gitea tracker write; the /boss auto-mode classifier
declined it as an unauthorised external write and it is surfaced to the
user rather than worked around. The end-to-end milestone fieldtest
remains the deliberate manual close-gate before the tracker milestone
is marked done.
refs #51#53
Brummel
a378dad0aa