---

name: locque-authoring description: Author or update Locque .lq code and tests with the canonical M-expr syntax, CBPV rules, data/match forms, modules/imports/opens, and project conventions.

Locque authoring

Use this skill when writing or editing Locque source or tests.

Sources of truth

• grammar.md defines the canonical syntax and S-expr mapping.
• AGENTS.md lists project conventions and tooling.

Workflow

1. Prefer .lq M-expr files; do not handwrite .lqs.
2. Keep paths lowercase. Every lib/** file must have a matching test/** file.
3. Use Module::name qualification; open Alias exposing ... end is explicit only.
4. Effects are explicit: computations are values via compute ... end, run via perform.
5. Multiline constructs must end with end (function, compute, bind, match, data, typeclass, instance, module, open, pack, unpack).
6. Data: define ... as data ... in TypeN ... end with constructors Type::Ctor; match uses case Type::Ctor.
7. No implicit coercions; use of-type, lift, up, down, pack, unpack as needed.
8. Use ignored instead of _ for unused binders.
9. List literals are canonical: [] and [a, b] (commas required). Empty lists require of-type [] (List A) when no expected list type is in scope.

Test conventions

• Use assert::assert-eq with an explicit type argument.
• Run smyth test after changes.

Templates

Function:

Copy# Assumes: import arithmetic as Ar
define transparent inc as
  function x Natural returns Natural value
    Ar::add x 1
  end

Data:

Copydefine transparent Option as data A Type0 in Type0
  case Option::none of-type Option A
  case Option::some of-type for-all x as A to Option A
end