Files
AILang/design/INDEX.md
T
Brummel bcd41810f4 design/ + source rustdoc: replace opaque shorthand with content phrases + links
Reader-facing prose and rustdoc carried opaque shorthand like
"Decision 10", "clause-5", "mq.1", "ct.1", "eob.1", "rpe.1",
"post-mq.3", and "Iter 22b.1:" with no in-repo definition the reader
could follow. This commit replaces every such occurrence in the
durable tier the reader is most likely to land on (design/ ledger +
source //! module headers + the central /// public-item rustdoc) with
an inline content phrase plus, where applicable, a Markdown link to
the file that defines the referenced concept.

design/ ledger — 16 files:
  Definition-site headings demoted from "Decision N: <title>" to
  "<title>": authoring-surface, tail-calls, memory-model section in
  rc-uniqueness.md, dual-allocator section, typeclass design,
  effects "pure core + algebraic effects".
  Cross-reference sites: "Decision 1" -> canonical-schema principle
  (data-model); "Decision 3/4" -> effects + scope-boundaries; "Decision
  6" -> authoring-surface; "Decision 8" -> tail-calls; "Decision 9" ->
  rc-uniqueness (dual-allocator); "Decision 10" -> memory-model;
  "Decision 11" -> typeclasses (model). "clause-5" -> body-link
  durability gate. "clause-3" (in language-constraints) ->
  bug-class-reintroduction discriminator. "mq.1/2/3", "ct.1/4",
  "eob.1", "rpe.1" -> the canonical-form rule / the type-driven
  dispatch / the Str carve-out / etc. "post-mq.3" -> "type-driven".

design/contracts/feature-acceptance.md: file-local "clauses 1/2/3"
-> "criteria 1/2/3" (sprachliche Kohärenz mit der File-Überschrift
"Feature-acceptance criterion"); "the clause-3 mechanism" -> "the
bug-class-reintroduction discriminator".

Source //! module headers — 24 files:
  Stripped "Iter X.Y:" prefixes and "(Decision N)" / "(mq.X)" tags
  from spec_drift, uniqueness, reuse_shape, migrate_canonical_types,
  typeclass_22b{2,3,c}, suppress_filter, lift, mono, linearity,
  diagnostic, method_dispatch_pin, method_collision_pin,
  no_per_type_print_ops, mq3_multi_class_e2e, print_mono_body_shape,
  print_no_leak_pin, cli_diag_human_workspace_load_error,
  ct1_check_cli, prose snapshot, unbound_in_instance_method_pin,
  mono_xmod_ctor_pattern, desugar.

Central /// public-item rustdoc:
  ast.rs (full sweep — every "Iter X" + "Decision N" prefix
  reformulated; mode/Type::Fn rustdoc now points at memory-model.md;
  Constraint / SuperclassRef / InstanceDef / ClassDef rustdoc points
  at typeclasses contract).
  diagnostic.rs (all "(Iter X)" / "(mq.X)" tags on diagnostic codes
  removed).
  lib.rs (FORM_A_SPEC rustdoc points at authoring-surface.md
  instead of "Decision 6").
  canonical.rs (type_hash + Float-literal rustdoc).

Still outstanding (for a follow-up commit): ~500 inline `//`
code-body comments with `Iter X.Y` markers across the workspace, and
a handful of `///` rustdoc items in hash_pin / workspace_pin / lift /
mono / suppress_filter test-pin and internal-function bodies. Code
identifiers (test filenames like `mq3_multi_class_e2e.rs`, function
names like `iter18e_drop_iterative_default_preserves_hashes`) stay
verbatim per the user's "code identifiers stay verbatim" rule.

Tests: design_index_pin 5/5 + docs_honesty_pin 5/5; workspace builds
clean; full `cargo test --workspace` previously green (every
`test result: ok` line, no FAILED line).
2026-05-20 09:47:33 +02:00

7.2 KiB

AILang Design — Index

The sole addressable entry point. Every contract and model is reached from here. A contract is a prescriptive, test-linked invariant; a model is a whitepaper narrative. ratifying-test names the green test that proves a contract still holds. link is polymorphic: a design/ file, or the authoritative source //! header when the code is the single source of truth.

Project framing

Goal

AILang is a programming language for LLM authors. It compiles to LLVM IR. Performance: native, no GC for the MVP.

Optimised for:

  • Machine readability over human ergonomics. The source is structured.
  • Local reasoning. Every definition carries its full type and effects.
  • Provability. Pure core language, explicit effects, optional refinements.
  • Robustness against hallucinations. Symbols are hashable; tools can verify existence without spending context window.

Project ecosystem

AILang is not just a language but an ecosystem. The language on its own is only valuable when its surroundings make it usable, checkable, and extensible for its target user (LLM authors). The repo therefore contains several equally important components — none of them optional, all of them evolving in lockstep with the language:

  • Language core (crates/ailang-core, crates/ailang-check, crates/ailang-codegen): AST, type system, codegen.
  • Surface forms (crates/ailang-surface, crates/ailang-prose): the LLM-facing renderings of a module. ailang-surface is the lossless Form-A printer/parser — the canonical authoring surface, with a round-trip property parse ∘ print = id gating every release. ailang-prose is the lossy Form-B projection — human-readable prose for review and edit, with no parser; re-integration goes through the LLM-mediator round-trip documented in docs/PROSE_ROUNDTRIP.md.
  • CLI (crates/ail): toolchain for tooling consumers — manifest, describe, deps, check, build, parse, render, prose, merge-prose, etc., preferably with --json for machine consumption.
  • Examples (examples/): canonical .ail.json programs. They are specification anchors, not demos — the E2E suite hangs off them.
  • Skills (skills/): specialised disciplines (brainstorm, planner, implement, audit, debug, fieldtest) plus the agent rosters they dispatch (skills/<name>/agents/). They form the project's own development methodology and are versioned with the codebase. See skills/README.md.
  • Design ledger (design/): design/INDEX.md (this file — the sole addressable spine for canonical state), design/contracts/ (test-linked invariants), design/models/ (onboarding whitepapers).
  • Docs (docs/): docs/journals/ (per-iter decisions log; see INDEX.md), docs/journal-archive.md (archived monolith for pre-2026-05-11 history), roadmap.md (forward queue), specs/ (per-milestone design specs), plans/ (per-iteration implementation plans).
  • Tests: unit tests per crate plus E2E in crates/ail/tests/e2e.rs. Every new compiler path needs a test, otherwise the feature does not count as done.

Project language: English

All in-tree content is written in English: source code (identifiers, comments, string literals, CLI help), design documents, the journal, agent prompts, READMEs, commit messages, examples, and CLAUDE.md. The live conversation between user and me stays German for ergonomic reasons; everything that lands in git is English. This keeps diffs and tooling output uniform and matches the audience for AILang (LLM authors), for whom English is the default.

Contracts

id consumer / lifetime ratifying-test link
feature-acceptance brainstorm-gate / stable skills/brainstorm/SKILL.md design/contracts/feature-acceptance.md
authoring-surface LLM author / stable crates/ailang-surface/tests/round_trip.rs design/contracts/authoring-surface.md
roundtrip-invariant every release / stable crates/ailang-surface/tests/round_trip.rs design/contracts/roundtrip-invariant.md
language-constraints LLM author / stable crates/ailang-check/src/uniqueness.rs (in-source mod tests) design/contracts/language-constraints.md
memory-model LLM author / stable crates/ailang-check/src/uniqueness.rs (in-source mod tests) design/contracts/memory-model.md
data-model LLM author / stable crates/ailang-core/tests/design_schema_drift.rs design/contracts/data-model.md
mangling codegen / stable crates/ail/tests/eq_ord_e2e.rs crates/ailang-codegen/src/lib.rs //!
env-construction codegen / stable crates/ailang-check/tests/duplicate_ctor_pin.rs crates/ailang-codegen/src/lib.rs //!
qualified-xref codegen / stable crates/ail/tests/codegen_import_map_fallback_pin.rs crates/ail/src/main.rs //!
frozen-value-layout embedding ABI / one-way-frozen crates/ailang-codegen/tests/embed_record_layout_pin.rs design/contracts/frozen-value-layout.md + runtime/rc.c §layout
float-semantics LLM author / stable crates/ail/tests/eq_float_noinstance.rs design/contracts/float-semantics.md
typeclasses LLM author / stable crates/ail/tests/show_no_instance_e2e.rs design/contracts/typeclasses.md
method-dispatch LLM author / stable crates/ail/tests/show_no_instance_e2e.rs design/contracts/method-dispatch.md
prelude-classes LLM author / stable crates/ail/tests/show_no_instance_e2e.rs design/contracts/prelude-classes.md
str-abi runtime ABI / stable crates/ail/tests/e2e.rs (Str path) design/contracts/str-abi.md + runtime/str.c §heap-Str
tail-calls codegen / stable crates/ailang-check/src/lib.rs (in-source tail_call_in_non_tail_position_is_rejected) design/contracts/tail-calls.md
honesty-rule architect+grounding / stable crates/ailang-core/tests/docs_honesty_pin.rs design/contracts/honesty-rule.md
embedding-abi embedding host / stable crates/ailang-codegen/tests/embed_record_layout_pin.rs design/contracts/embedding-abi.md
scope-boundaries architect+author / stable crates/ailang-core/tests/effect_doc_honesty_pin.rs design/contracts/scope-boundaries.md
verification architect / stable bench/architect_sweeps.sh design/contracts/verification.md

Models

id consumer / lifetime link
rc-uniqueness onboarding / evolves design/models/rc-uniqueness.md
typeclasses onboarding / evolves design/models/typeclasses.md
effects onboarding / evolves design/models/effects.md
authoring-surface onboarding / evolves design/models/authoring-surface.md
prose-projection onboarding / evolves design/models/prose-projection.md
pipeline onboarding / evolves design/models/pipeline.md