feat: add parametric tuple types#341
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Adds `Tuple<T1, ..., Tn>` (arity >= 2) as a parametric type, mirroring
List/Map: the type carries its element types and erases to a bare TIR
`Type::Tuple`. Covers the full pipeline — grammar, AST, parsing, analysis,
lowering — plus spec sections (§4.3/§4.4/§5.2/§5.9) and examples.
Surface syntax:
- Type: `Tuple<Int, Bytes>`
- Literal: `(e1, e2, ...)` (>= 2 elements; `(e)` is grouping, `()` is unit)
- Access: `t[i]` with an integer-literal index, resolving to that
position's element type
Element access uses bracket indexing rather than Rust-style `.0`/`.1`: a
`.<number>` postfix is lexically ambiguous with the `asset` literal
separator `policy.asset_name`, where the name can be a bare number or hex.
Adds an end-to-end facade test and a `tuples` example (parse + lower
snapshots), and threads a tuple field/literal/access through the language
tour.
Requires tx3-tir with `Type::Tuple` and the N-ary `Expression::Tuple`
(tx3-lang/tir#3). Bump the tx3-tir dependency once that releases.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This was referenced Jun 11, 2026
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Summary
Adds parametric tuple types to the Tx3 language, mirroring
List<T>/Map<K,V>.Tuple<T1, ..., Tn>(arity ≥ 2) — the type carries its element types and erases to a bare TIRType::Tuple.(e1, e2, ...)— two or more comma-separated expressions in parentheses.(e)is grouping and()is unit, so tuples start at two elements.t[i]— bracket indexing with an integer literal; the result is that position's element type. The index must be a literal (heterogeneous positions can't be typed under a runtime index); out-of-range is a compile error.Touches the full frontend pipeline (
tx3.pest,ast.rs,parsing.rs,analyzing.rs,lowering.rs), the spec (§4.3/§4.4/§5.2/§5.9), and adds tests + examples.Why bracket indexing, not
.0/.1A
.<number>postfix is lexically indistinguishable from theassetliteral separatorpolicy.asset_name, where the asset name can be a bare number or hex (asset X = 0xPOLICY.333;). No PEG trick disambiguates<expr>.<digits>, so tuples reuse the existing[i]index form.Tests & examples
tuple_end_to_endfacade test (parse → analyze → lower →Expression::Tuple).examples/tuples.tx3registered in the parse + lower snapshot harness.examples/lang_tour.tx3(snapshots regenerated).tx3-langsuite: 184 + 4 passing.Release ordering
Depends on tx3-lang/tir#3 (
Type::Tuple+ N-aryExpression::Tuple). Merge after that releases, and bump thetx3-tirdependency to the released version. Downstream:tx3-lsp,tx3-mcp(need thistx3-langrelease);tx3-lift(needs the tir release).🤖 Generated with Claude Code