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… emits the closure A module is admitted by every executing check -- it parses, it typechecks, its witnesses evaluate -- because every one of those checks runs it under the SEED INTERPRETER. Its emitted Rust is produced by nothing on the merge path, so a declaration whose EMISSION is ill-typed, or whose operator has no host realization, lands clean and takes down the ability to build the v2 compiler. Observed at main 87c6658: the self-host instrument refused EmittedCompilerBuildFailed status=101. Emission completed; cargo then reported three errors in src/std_integer.rs -- two E0308 expecting PhantomData<(i64, MachineWidth<()>)> and finding i64, and one compile_error! that host operator `+` on std.integer.UInt8 has no host realization. The differential names one commit: 6bb950a (#11643) added 146 lines declaring UInt8Result, uint8_of_int and octet constructors over UInt8 = Compose<UInt, MachineWidth<8>>. The row holds the proposed cause separate from the observation, because which link owns the defect -- the emitter's operator realization, the width composition's emitted representation, or the added declarations -- is a reading of v1.compiler.emit_rust this row does not make. The class, rather than the instance, is that a floor in full working order would not have caught it either: every floor route evaluates under the interpreter, where UInt8 arithmetic never reaches emission. The only executing consumer is an instrument, and no CI step invokes any of the twelve labels. Meanwhile compiler_frontend_program_status reported SelfHostCorpusEmitsCleanly as Clear throughout, from a receipt nothing refreshes -- DESIGN 4b(1) rung inflation. Ceiling is mechanically preventable rather than impossible, since whether emitted Rust typechecks is rustc's judgment. The trigger is named at capability grain: an executing consumer of the retained closure's EMISSION whose refusal reaches a process exit. Membership is the directory; roster.dag is generated and gitignored, so this commit is the row file alone. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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| "PROPOSED CAUSE, HELD SEPARATE FROM THE OBSERVATION because it is not established here: the added declarations construct and perform arithmetic on a width-composed integer whose emitted representation carries the width as a phantom parameter, and the emitter has no host realization for `+` on that operand. What is observed is the three errors and the differential. Whether the defect is owned by the emitter's operator realization, by the width composition's emitted representation, or by the added declarations is a reading of `v1.compiler.emit_rust` that this row does not make. The next reader owes that chain (DESIGN section 6b) rather than a patch at whichever link the error printed.", | ||
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| "WHY NO GATE SAW IT, which is the class rather than the instance. The required check at that revision built the seed and ran a floor that concludes success while refusing (see required_floor_passes_with_a_failed_phase). But even a FLOOR IN FULL WORKING ORDER would not have caught this one: every floor route runs declarations under the interpreter, where `UInt8` arithmetic evaluates without ever being emitted. The only executing consumer of the emission is the self-host instrument, and `gunbc.instrument_targets` binds twelve labels of which NO CI STEP INVOKES ANY. So the emission path has no executing consumer on the merge path at all.", |
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At the cited 87c6658641e revision, gunbc.instrument_targets::instrument_targets() contains 13 labels, not twelve, with floor_memory_qualification_label() as the thirteenth; instrument_bindings() likewise has 13 entries. This records a false denominator in the failure-mode ledger and can mislead later audits of whether the complete instrument population is invoked by CI, so derive the count or correct it to thirteen.
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Withdrawn: this is a second name for The two receipts that were genuinely new — the twelve instrument labels with no invoking CI step, and the rung-inflated |
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The class
A module is admitted by every executing check — it parses, it typechecks, its witnesses evaluate — because every one of those checks runs it under the seed interpreter. Its emitted Rust is produced by nothing on the merge path. So a declaration whose emission is ill-typed, or whose operator has no host realization, lands clean and takes down the ability to build the v2 compiler.
Observed, at main
87c6658641egunbc test //gunbc/instruments:self-hostrefusedEmittedCompilerBuildFailed status=101. Emission itself completed; cargo then reported three errors insrc/std_integer.rs, emitted fromdag/std/integer.dag:E0308 expected PhantomData<(i64, std_machine_constraints::MachineWidth<()>)>, found i64compile_error!("operator realization: host operator+on structural operand std.integer.UInt8 — the declaration has no host realization and declares no operator")The same instrument built cleanly at
31bbd220f9d.git log 31bbd220f9d..87c6658641e -- dag/std/integer.dagnames exactly one commit:6bb950a5589(#11643, NUMERIC-BIT-0), which added 146 lines declaringUInt8Result,uint8_of_intand octet constructors overUInt8 = Compose<UInt, MachineWidth<8>>.The proposed cause is held separate from the observation, per DESIGN §4d. What is observed is three errors and a differential. Whether the defect is owned by the emitter's operator realization, by the width composition's emitted representation, or by the added declarations is a reading of
v1.compiler.emit_rustthis row does not make — the next reader owes that chain (§6b) rather than a patch at whichever link printed the error.Why no gate saw it — which is the class, not the instance
The required check at that revision ran a floor that concludes success while refusing. But a floor in full working order would not have caught this one either: every floor route evaluates declarations under the interpreter, where
UInt8arithmetic never reaches emission. The only executing consumer of the emission is the self-host instrument, andgunbc.instrument_targetsbinds twelve labels of which no CI step invokes any.Meanwhile
gunbc.compiler_frontend_program_statusreportedSelfHostCorpusEmitsCleanlyas Clear throughout, derived from a receipt nothing refreshes — DESIGN §4b(1) rung inflation, stated exactly: the reported rung exceeded the rung established by executed evidence.This was one of three independent breakages live on main within a day. I could not build the v2 compiler without locally applying two other in-flight repairs first, and then hit this.
Rung and trigger
Found at mitigatable, and only by hand. Ceiling is mechanically preventable, not impossible — whether arbitrary emitted Rust typechecks is rustc's judgment, which sits in §4b's outside-the-modeled-guarantee column.
Trigger named at capability grain, not artifact grain: an executing consumer of the retained closure's emission, whose refusal reaches a process exit. Explicitly not satisfied by refreshing the standing by hand, or by any check that runs declarations under the interpreter.
Scope
One file. Membership is the directory (
roster.dagis generated and gitignored), so no roster edit. Verified: the row compiles; the 21 blocking errors its compile reports are the pre-existing in-body-annotation defects in five other files, none in this row.🤖 Generated with Claude Code