feat[next]: Direct subscripting of variable-length tuples - #2838
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Allow indexing 'tuple[Field, ...]' parameters directly, e.g. 'tracers[0] * factor': the subscript type deduction accepts any literal index on a 'ts.VarArgType' and yields the element type. Extracted from #2833 pending a decision; likely to be skipped, since the field operator cannot be fully type checked at definition time (the tuple length is only known at call/compile time, so an out-of-range index only surfaces late, in 'unroll_map_tuple').
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Allow indexing variable-length tuple parameters directly, e.g.
The subscript type deduction accepts any literal index on a
VarArgTypeand yields the element type; lowering and tests (test_tuple_vararg) included.Extracted from #2833 pending a decision on whether we want this at all.
Stacked on-top of: #2833
Concern (why this is likely to be skipped): subscripting a variable-length tuple is arguably an anti-pattern — the field operator cannot be fully verified/type checked at definition time, since the tuple length is only known at call/compile time. An out-of-range index therefore only surfaces late, in
unroll_map_tuple, instead of as a frontend diagnostic at the subscript.Disclaimer: This PR and its description were written largely with the help of AI. Code was not reviewed yet.