Move NonEmptyTuple members into Tuple
#21291
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bishabosha
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Jul 29, 2024
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@bishabosha By the way, sorry I forgot this PR also had the tuple change for some reason, which I did not mean to assign to you. I'll split the PR into two, with an example of why the second commit is needed. |
EugeneFlesselle
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This is in particular necessary for scala#21291, to avoid problems encountered after inlining from scopes defining opaque types (such as in the example below), as was already done for the other NamedTuple operations in scala#20504. ```scala -- Error: tests/pos/named-tuple-combinators.scala:46:17 ------------------------ 46 | val res1 = x.head | ^^^^^^ |(Int, String) does not conform to bound >: | (x$proxy55 : (x : Test.NT) & | $proxy19.NamedTuple[ | Tuple.Concat[ | NamedTupleDecomposition.Names[ | $proxy19.NamedTuple[Tuple1[("hi" : String)], Tuple1[Int]]], | NamedTupleDecomposition.Names[ | $proxy19.NamedTuple[Tuple1[("bla" : String)], Tuple1[String]]] | ], | Tuple.Concat[ | NamedTupleDecomposition.DropNames[ | $proxy19.NamedTuple[Tuple1[("hi" : String)], Tuple1[Int]]], | NamedTupleDecomposition.DropNames[ | $proxy19.NamedTuple[Tuple1[("bla" : String)], Tuple1[String]]] | ] | ] | ) | <: Tuple |---------------------------------------------------------------------------- |Inline stack trace |- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - |This location contains code that was inlined from NamedTuple.scala:47 47 | inline def head: Tuple.Elem[V, 0] = x.apply(0) | ^^^^^^^ ---------------------------------------------------------------------------- ```
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Addressing scala#19175 The motivation for this has already been established, among other things: - the corresponding type level operations already use `Tuple` as upper bound; - the corresponding `NamedTuple` operations also do not make a distinction; - these operations are no more unsafe than other operations already available on `Tuple`, such as `drop` Note this should _not_ be a problem for binary compatibility, as both `Tuple` and `NonEmptyTuple` are erased to `Product`s (see `defn.specialErasure`).
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sjrd
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Nov 11, 2024
WojciechMazur
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👍 This is also a win for discoverability — as seen on #21928 , it did not occur to either me or the user on Discord to look in the Scaladoc for |
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The motivation for this has already been established, among other things:
Tupleas upper bound;NamedTupleoperations also do not make a distinction;Tuple, such asdrop.Note this should not be a problem for binary compatibility, as both
TupleandNonEmptyTupleare erased toProducts (seedefn.specialErasure).See #19175 (comment) for related changes.
Based on #21308