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go: types.sx — declaration checking (var/const/type + :=) + 12 tests [nothing]

Phase 3 cont. Adds go-check-decl which dispatches on AST shape and
returns either the extended context or a :type-error:

  :var-decl     (:field NAMES TYPE-or-nil) EXPRS-or-nil
  :const-decl   (same shape; same logic in v0 — mutability later)
  :short-decl   LHS-LIST EXPRS         (lhs is a list of :var nodes)
  :type-decl    NAME TYPE              (type alias)

New helpers:

  go-default-type      — untyped-int → int, untyped-float → float64,
                         etc. Used when inferring var x = EXPR.
  go-check-exprs-against — every expr assignable to the declared type.
  go-bind-names-to-synth  — pair names with default-typed synth of
                            corresponding exprs; extends ctx.

The canonical Go pitfall flows through end-to-end now:

  (go-check-decl ctx (go-parse "var x float64 = 42 / 7"))
  →  ctx + (x → float64)

Because: 42/7 synthesises to ty-untyped-int (binop result of two
untyped operands), then go-check-exprs-against uses go-type-assignable?
to check ty-untyped-int → ty-name "float64" — :ok via the
untyped-int-to-any-numeric assignability rule. The 6 (integer) result
gets float-converted on assignment, never floated mid-computation.

types 40/40, total 345/345.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

2026-05-27 20:49:27 +00:00

320 B

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Total: 345 / 345 tests passing

	Suite	Pass	Total
✅	lex	129	129
✅	parse	176	176
✅	types	40	40
⬜	eval	0	0
⬜	runtime	0	0
⬜	stdlib	0	0
⬜	e2e	0	0

Generated by lib/go/conformance.sh.

320 B Raw Blame History

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320 B

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