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gen-rust: a slice beside a len field and a [N]str element pass to rustc (D1 and D3 of #11182; Closes #11182) - #11213
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…d filled from borrowed storage (Closes #11182) Three gen-rust defects from the RFC experiment of #11177 (D1-D3), each reproduced on a t27c built from master cf2d61e (0.5.2) before any change: D1. A struct field called `len` anywhere in the module switched the `x.len` -> `x.len()` rewrite off for EVERY base (a whole-file name census), so a slice, array, string or Vec length reached rustc as a field: E0615 / E0616, and the free `len(x)` call as E0425. D2. A `[]T` struct field is written `Vec<T>` and a `[]T` parameter stored in it is taken by value, which moves the caller's storage (specs/tri/collections/stack.t27: `items: Vec<i64>`, `empty(storage: Vec<i64>)`); `&x` stored in one does not type-check at all. D3. The element of a `[N]str` constant, array field or a call returning str is an `&str`; `rust_type_of` knew only plain names, so it was not turned into bytes where `[]const u8` is expected (E0308) or indexed (E0277). Fix, all in bootstrap/src/compiler.rs, hand Rust net -10 (+40/-50), FROZEN_HASH moved: - rust_type_of now answers for a name, a call, a typed struct field and an element of a typed array; len_is_method uses it, so with a `len` field in the file `x.len` is a method only where x is a slice/array/string/Vec and stays a field for a struct or an unknown base. The free `len(x)` no longer depends on the census. - compile_rust refuses `S{ .f = p }` / `s.f = p` where f is a `[]T` field and p a `[]T` parameter or `&x`, with the field named: a borrow needs a lifetime on the struct and on every constructor, which this back end does not write, so it is refused, not guessed. `[]const u8` (text), `[T]`, arrays and a field nothing fills from borrowed storage are not refused. Test, red first: specs/compiler/rust_slice_lowering.t27 (a `len` field beside every shape; its Zig/t27b tests pass, 13 runtime asserts) is compiled with rustc by backend_behaviour.rs, with fixtures bootstrap/tests/fixtures/rust_slice_fields (4 refuse_*, 4 keep_*). On master the test fails with 11 rustc errors; with the fix it passes. Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
… the 66 it now refuses (Closes #11182) The emitter change of the previous commit moves gen-rust output, so the seals follow, as tools/check_seal_coverage.py (gen-drift, 208 seal files) and tools/check_seal_currency.py (76 stale gen_hash_rust) demanded when run with this branch's t27c. - 48 specs whose Rust changed only by `.len` -> `.len()`, `.as_bytes()` added and `as usize` bridge casts (every changed hunk of all 85 changed outputs, 49 of them with a seal, reduces to those three; 0 other): re-saved with `t27c seal --save`, twins in sync (`tri seals sync-twins` writes 0 files). - 72 specs gen-rust now refuses: re-saved with `--force`, which records gen_hash_rust=none and leaves the other hashes and the test results as they were, the state 8 other seals already hold. - specs/ml/train_hslm.t27 (Rust changed by one `.as_bytes()`): `seal --save` refuses on this Mac because its test the_profile_moves_no_bit_and_sees_the_call_order fails (36 of 37) with master's own binary too, while the Zig output hash is byte-identical to the one sealed with 37 of 37 on 2026-10-19. Only gen_hash_rust of ml_train_hslm.json is edited, by hand; the recorded test result is untouched. - specs/compiler/rust_slice_lowering.t27 is sealed (new). - docs/reports/suite_expectations.json: 66 gen-rust rows (reason, #11182, expiry 2026-11-30), max_entries 69 -> 135, the reason in _why_entries_rose. The 73 refused specs are 66 here, 3 already ledgered under parse-no-discard, 4 outside specs/. All 73 failed rustc on master. Locally with this branch's t27c: check_seal_coverage OK (2939 seals, 2826 hold, 113 known-broken), check_seal_currency 0 stale, `t27c suite --ratchet --corpus-only` RATCHET: CLEAN (ledger 135 of 135, 0 unexpected). Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
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This was referenced Oct 20, 2026
…s to #11218 (Closes #11182) Split on the coordinator's request: this branch is now the slice-length and string-element fixes only. D2 (a []T struct field filled from borrowed storage: the refusal, its fixtures, the 66 suite_expectations.json rows and the --force seals) moves to a separate draft pull request for #11218, because a +66 ledger rise is a policy decision. - compiler.rs: the D2 refusal is gone; return_unsized is back (it was inlined only to pay budget). rust_type_of and len_is_method (D1, D3) are unchanged except for one guard found by re-measuring: a RANGE slice of a str FIELD (`&ac.source[a..b]`) stays a &str; only an integer index of a field, element or call result, and any index of a plain name (as before), becomes bytes. specs/tri/search/aho_corasick.t27 returned `&[u8]` from a `-> str` function otherwise. - backend_behaviour.rs: the test keeps only the spec built and run with rustc (`slice_len`, `array_len`, `name_bytes`, `name_first_byte` computed by the generated Rust). - bootstrap/tests/fixtures/rust_slice_fields, docs/reports/suite_expectations.json and the seals of the 72 refused specs are back to master's. Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
This was referenced Oct 20, 2026
…d string-element fixes move, and seal the new spec (Closes #11182) With this branch's t27c, tools/check_seal_currency.py listed 58 specs with a stale gen_hash_rust (master: 0). Every changed hunk of the 96 changed outputs reduces to `.len` -> `.len()`, `.as_bytes()` added and `as usize` bridge casts (plus the free `len(x)` call in the new spec). Re-saved with `t27c seal --save`; `tri seals sync-twins` writes 0 files. specs/ml/train_hslm.t27 (Rust changed by one `.as_bytes()`): `seal --save` refuses on this Mac because its test the_profile_moves_no_bit_and_sees_the_call_order fails (36 of 37) with master's own binary too, while its Zig output hash is byte-identical to the one sealed with 37 of 37 on 2026-10-19. Only gen_hash_rust of .trinity/seals/ml_train_hslm.json is edited, by hand; the recorded test result is untouched. Locally: check_seal_coverage OK (2941 seals, 2828 hold, 113 known-broken), check_seal_currency 0 stale (2839 current, 8 sealed with gen_hash=none, as on master). Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
…rmance.t27, not a new spec (Closes #11182) That file's header says to add the next case there and not to open a spec per bug (#8963), and `tri pr preflight` fails an added spec without a docs/reports/t27b_expectations.json row, which this change must not edit. The module now declares a struct with a field `len` (LenCell) and holds the shapes that broke: a slice, written slice, array and free `len(x)` length, a `len` field read next to a slice length, a text field's length and bytes, and the elements of its existing `[3][]const u8` table passed on and indexed as bytes. - specs/compiler/rust_slice_lowering.t27 and its seal are removed again. - Zig (`t27c test-report`): 18 of 18, 12 new runtime asserts, 0 vacuous. t27b: 18 passed. gen-rust output builds with rustc; the same spec built from master's t27c gives 13 rustc errors (8 E0615, E0425, 2 E0308, E0277, one more). - backend_behaviour.rs: the existing the_codegen_conformance_spec_compiles_and_runs_as_rust prints four more values (slice_len, array_len, name_bytes, name_first_byte computed by the generated Rust); +3/-3 lines, no new test. - compiler_CodegenConformance.json re-saved; sync-twins writes 0 files. Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
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PR DashboardGenerated at: 2026-10-20 04:23:01 UTC
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Closes #11182
D1 and D3 of #11182, split from the D2 refusal on the coordinator's request: this pull request moves no spec to a refusal and edits no ledger. D2 (a
[]Tstruct field filled from borrowed storage; 73 specs refused, 66 ledger rows) is now #11218, with its own draft pull request;Closes #11182stays here because D1 and D3 are what this fixes. Found by the RFC experiment of #11177 (section 6.1); reproduced on at27c 0.5.2built from master cf2d61e (compiler.rsunchanged on master since). Hand Rust:compiler.rs+25/-44; withbackend_behaviour.rsandFROZEN_HASH, 29 foreign lines added and 48 deleted.An earlier version of this body made rustc claims about the corpus outputs that came from a broken measuring loop (it named the crate after a file called
*.t27.out, which rustc refuses before type checking). They are retracted; the corpus numbers below are re-measured with a valid crate name.Probe matrix
Every cell is a spec,
t27c gen-rust,rustc --crate-type lib --edition 2021; 93 cells in all, the 74 of D1 and D3 below.x.lennext to a struct fieldlen(24 shapes, with and without the field)[N]strelement passed, compared, indexed or measuredNo cell that compiled on master is wrong now. D1 fixed: slice
[]const u8,[]i64, written&mut [T], array parameter, array local,strparameter,strconstant, a slice or array held in a struct field (h.items.len,w.buf.len),t.lenin awhile, in an index, beside au32, besidec.len(both orders), the freelen(x)(E0425). D3 fixed:takes(NAMES[i]), a local[N]strarray, a parameter, a struct field,[N][]const u8, two arguments, a nested call,s == NAMES[0]both ways,t.name, a call returningstr,NAMES[0][0],t.name[0],t.name.lenbeside alenfield. D1 still wrong, 9 cells, 2 of them D1: an untyped localconst u = t; u.lenkeeps the field reading (its type is not declared), andt[0..2].len, written&t[0..2].len(), loses to precedence (E0308 with or without alenfield). The other 7 do not depend on alenfield or are invalid cells:t.len + p.lo(usize plus u32, E0277, x2), a cell that reads a slice after moving it (E0382, x2), a typed[]const u8local initialised from a range (E0308, x2), the range cell without alenfield (E0308).Causes and fixes (
bootstrap/src/compiler.rs)expr_to_rust,infer_int_typeand the freelen(x)call asked!self.field_names.contains("len"), a whole-file census: one struct with a fieldlenswitched the method form off for every base. Nowlen_is_method(base)asks the base's declared type (Vec<, array,&[,&'static str) when the file has such a field; a struct or an undeclared base keeps the field reading. The free call no longer depends on the census (a freelen(x)is a length call in any file).rust_type_ofanswered for a plain name only, so the three places that turn text into bytes (.as_bytes()at a[]const u8argument, at a comparison with bytes, at an index) never sawNAMES[0],t.nameorg(). It now answers for a name, a call, a typed struct field and an element of a typed array (Vec<T>or[T; N]); the index site shrinks from 8 lines to 1. One cause, three sites. One guard, found by re-measuring: a range slice of a str FIELD (&ac.source[a..b]) stays a&str;specs/tri/search/aho_corasick.t27returned&[u8]from a-> strfunction otherwise.Nodetree, which no.t27spec the compiler mounts models.Test, red first
The cases go into
specs/compiler/codegen_conformance.t27, whose header says to add the next case there and not to open a spec per bug (#8963); a new spec would also need adocs/reports/t27b_expectations.jsonrow, whichtri pr preflightdemands and this change must not edit. The module now declares a struct with a fieldlenand holds the shapes that broke. Its 2 new tests pass under Zig (t27c test-report: 18 of 18, 12 new runtime asserts, 0 vacuous) andt27b test(18 passed). The existingthe_codegen_conformance_spec_compiles_and_runs_as_rustinbackend_behaviour.rsprints four more values computed by the generated Rust (3 4 2 99); +3/-3 lines, no new test.t27con that spec: rustc rejects its Rust with 13 errors (9 E0615, 2 E0308, E0425, E0277; the commit message of 55f2b1c says 8 E0615 and one more, which is the same 13). With the fix it builds and the test passes;cargo test --release -p t27c --test backend_behaviour: 26 passed. I did not rerun the cargo test itself against a master-builtt27c(the same rustc step was run by hand with master's binary).Corpus effect (
t27c gen-rustover the 2862 tracked .t27 files, master binary against this one).lento.len()hunks, 416.as_bytes()hunks and 42 hunks that carry anas usizebridge cast (a comparison such ask < needle.lennow knows the right side is usize, as in a module without alenfield) or several rewrites in one line. Checked file by file: with.as_bytes(),.len()and casts normalised away, 95 of the 96 equal master's output; the 96th iscodegen_conformance.t27itself (new functions).claw/t27f_gate,compiler/codegen_conformance,port/scripts/gen_w309,gen_w388,tri/collections/variant,tri/crypto/base32,base64,tri/search/rabin_karp,verified/corpus_merkle); errors 4036 to 3328; files with E0615 38 to 4, E0616 7 to 2, E0277 20 to 11, E0308 75 to 67, E0425 32 to 31; 89 files with fewer errors, 5 the same, 2 with more (widgets/bit_autopsy_logic,widgets/pin_map_logic): the type errors that hid the borrow checker are gone (E0308 1 to 0 in one) and rustc now reports the E0596 / E0502 it could not reach before (6 to 14 and 5 to 16 errors).gen/rustandbootstrap/gen/rust(120 files): none belongs to a moved spec, so none changes.Seals
With this branch's
t27c,tools/check_seal_currency.pylisted 58 specs with a stalegen_hash_rust(master: 0). Re-saved witht27c seal --save(57),codegen_conformancere-sealed after its extension, andspecs/ml/train_hslm.t27by hand (onlygen_hash_rustofml_train_hslm.json):seal --saverefuses on my Mac becausethe_profile_moves_no_bit_and_sees_the_call_orderfails (36 of 37) with master's own binary too, while its Zig hash is byte-identical to the one sealed with 37 of 37 on 2026-10-19; its Rust changed by one.as_bytes(); the recorded test result is untouched. 93 seal files changed;tri seals sync-twinswrote 0. Now: coverageOK: 2941 seals, 2828 hold, 113 known-broken; currency 0 stale (2839 current, 8 sealed with gen_hash=none, as on master). Master'scoverageandspec-guardscheck-runs at cf2d61e were success.One line per re-saved spec (59; 37 more changed specs have no seal)
compiler/cli/spec.t27: 10.len->.len()contrib/backend/zig/legacy/main_zig_handwritten.t27: 2.as_bytes()addedspecs/ar/coa_planning.t27: 7.len->.len(); 2as usizebridge castsspecs/ar/proof_trace.t27: 4.len->.len()specs/claw/t27f_gate.t27: 10.as_bytes()addedspecs/compiler/codegen_conformance.t27: spec extended with 2 tests and 11 functions (this PR's cases)specs/effects/capability.t27: 16.len->.len()specs/igla/coder/tokenizer.t27: 2.as_bytes()addedspecs/lsp/protocol.t27: 1.as_bytes()addedspecs/ml/train_hslm.t27: 1.as_bytes()added (hash edited by hand, see Seals)specs/network/mvp_v3.t27: 3.len->.len()specs/network/mvp_v3_ed25519.t27: 13.len->.len(); 1.as_bytes()addedspecs/pins/parser.t27: 6.as_bytes()addedspecs/port/bootstrap/src/weight_bram.t27: 7.len->.len(); 1.as_bytes()addedspecs/port/browseros/trios/agent-server/apps/server/src/lib/agents/runtime/registry.t27: 2.as_bytes()addedspecs/port/browseros/trios/agent-server/apps/server/src/lib/provider-error-classifier.t27: 2.as_bytes()addedspecs/port/browseros/trios/agent-server/apps/server/src/tools/filesystem/ls.t27: 4.as_bytes()addedspecs/port/scripts/gen_w309.t27: 3.as_bytes()addedspecs/port/scripts/gen_w374.t27: 26.len->.len()specs/port/scripts/gen_w377.t27: 9.len->.len()specs/port/scripts/gen_w388.t27: 21.len->.len()specs/port/scripts/gen_w390.t27: 1.len->.len()specs/port/tools/dedupe_identical_tests.t27: 11.as_bytes()addedspecs/port/tools/published_figures.t27: 2.as_bytes()addedspecs/port/tools/queen/needs_boundary.t27: 1.as_bytes()addedspecs/port/tools/trinity_fpga_adapter.t27: 11.len->.len()specs/port/trinity/src/tri/farm_telegram.t27: 8.as_bytes()addedspecs/port/trinity/src/tri/gen_record_store.t27: 1.len->.len()specs/port/trinity/src/tri/gen_regression.t27: 1.len->.len()specs/port/trinity/src/tri/gen_skiplist_impl.t27: 1.len->.len()specs/port/trinity/src/tri/gen_varint.t27: 2.len->.len()specs/port/trios/apps/trios-macos/rings/RUST-13/clade-meshd/src/key_store.t27: 10.len->.len()specs/port/trios/crates/trios-cli/src/main.t27: 1.len->.len()specs/port/trios/crates/trios-golden-float/build.t27: 2.as_bytes()addedspecs/port/trios/crates/trios-host-cdp/rings/HC-01/src/lib.t27: 1.len->.len()specs/port/trios/crates/trios-mesh-node/src/crypto.t27: 1.len->.len()specs/port/trios/crates/trios-train-cpu/src/bin/gradient.t27: 6.len->.len()specs/sandbox/https_enforce.t27: 1.as_bytes()addedspecs/server/mdns.t27: 1.as_bytes()addedspecs/server/router.t27: 3.as_bytes()addedspecs/server/sse.t27: 5.as_bytes()addedspecs/sync/schema.t27: 1.as_bytes()addedspecs/test_framework/core.t27: 2.len->.len(); 2as usizebridge castsspecs/test_framework/runner.t27: 14.len->.len(); 9as usizebridge castsspecs/tri/collections/array.t27: 15.len->.len()specs/tri/collections/variant.t27: 1.as_bytes()addedspecs/tri/crypto/base32.t27: 3.as_bytes()addedspecs/tri/crypto/base64.t27: 3.as_bytes()addedspecs/tri/io/filesystem.t27: 1.as_bytes()addedspecs/tri/io/fs.t27: 1.as_bytes()addedspecs/tri/net/async_stream.t27: 2.len->.len()specs/tri/net/url.t27: 5.as_bytes()addedspecs/tri/pipeline/builder.t27: 3.len->.len()specs/tri/search/rabin_karp.t27: 1.as_bytes()addedspecs/tri/search/regex_advanced.t27: 2.as_bytes()addedspecs/tri/utils/template.t27: 6.as_bytes()addedspecs/tri/utils/utf8.t27: 9.len->.len()specs/tri/utils/version.t27: 2.as_bytes()addedspecs/verified/corpus_merkle.t27: 2.as_bytes()addedOwn-language and FROZEN_HASH
git diff --numstat --no-renames BASE...HEAD | budget(compiled from the merge base'sgen/c/policy/own_language.c): exit 0.compiler.rs+25/-44,backend_behaviour.rs+3/-3,FROZEN_HASH+1/-1: 29 foreign lines added, 48 deleted (the spec is.t27and not counted); the path gate (check_all, exceptions from BASE) exit 0.FROZEN_HASH=bc931a7f7fb31cab2b917e2a95e69cf8aa393f37eee134012d3f128f5fcecdb2=shasum -a 256 bootstrap/src/compiler.rs. The deletions are the code the change replaces: the multi-line census guards, the 8-line identifier-only index test, and comments the new rule makes false.Gates and results
cargo check -p t27c --all-targets: exit 0.cargo build --release -p t27c: ok (the binary behind every number above).cargo test --release -p t27c --test backend_behaviour: 26 passed. On the earlier combined head I also ran one harness after another: rust_value_parameters 4, rust_repeat_counts 5, rust_tail_returns 6, rust_constant_case 5, transitive_copy 5, string_literal_quotes 7, generic_struct_warning 5, duplicate_declarations 13, unknown_type 9, t27a_cli 7, corpus_unresolved 7, deterministic_output 1, all passed; they were not rerun after the D2 code left, and none of them touches it.tri types ratchet: CLEAN (107 of 107);tri types classified: OK;python3 -I tools/dupe_scan.py: merge base 1632 of 17646 bodies in 632 groups, branch 1632 in 632, "no new duplicate body";tools/check_devhome_paths.py: ok;tri hooks pre-commitandl1-check: pass;tri pr preflight --quick: exit 0, every rule that ran passed (ledgers, budget, seal, dupes, types, census, devhome, kept); added lines are ASCII, no local paths.Found, not fixed
return a[i];/return s.field;from a-> ?Tfunction is not wrapped inSome(..): the real cause of the two type errors inspecs/tri/collections/stack.t27, which the RFC put down to D2. Filed as [bug] gen-rust: a value returned from a ?T function is not wrapped in Some(..) when it is an index or a field #11219.[]Tfield filled from a[]Tparameter or&xis writtenVec<T>and moves the caller's storage.t[a..b].lenprecedence; a typed[]const u8local from a range;t.len + p.lowidth mix; an untyped localconst u = t;keepsu.lenas a field in a file that declares alenfield.Not run
The full
cargo test -p t27c; the corpus ratchet (tri pr preflightwithout--quick,t27c suite --ratchet --corpus-only: no refusal and no ledger row moved, the combined D1 + D2 head endedRATCHET: CLEANat ledger 135 of 135, which does not speak for this diff);core_selfhost(gen-c, not touched); a Linux run; the CI jobs themselves.🤖 Generated with Claude Code