Handle generic tuples when inlining #14209
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nicolasstucki
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nicolasstucki
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Jan 5, 2022
| // If we take the `tree1` then it is impossible to select the `_1` field. If we take the parameter type we can lose singletons references that we should keep. | ||
| // Ideally we should ascribe it to a `tup.type & Tuple2[Int, Int]` but that is not working because we have the some special sub-typing rule that makes | ||
| // `1 *: 2 *: EmptyTuple <:< Tuple2[Int, Int]`. Therefore the glb of the two types ends up being `tup.type` which drops the extra information we need to add. | ||
| // None of the following attempts work. |
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@odersky do you have any idea how we could make this work?
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An alternative would be to teach member resolution that if we have a generic tuple with a known size that erases to TupleN it has the members of that TupleN class. For example a Int *: EmptyTuple would have the member _1 because it has the members of TupleN.
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This member selection issue is not contained in inlining. It was fairly straightforward to reproduce using type parameters in #14215.
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@odersky said to look at
Line 3848 Typer: pt match
case pt: SelectionProto =>
insert type ascription and readapt
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Fixes #14182