Drop FreeSeqFactory from stdlib-cc #19849
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FreeSeqFactory was a construction to demonstrate type safety for certain iterableFactory.from calls where we rely in the fact that for all Seqs iterableFactory has an eager implementation of from. While that shows that we _can_ make it typesafe, it does not work at runtime as a drop-in replacement for stdlib since of course stdlib does not have a FreeSeqFactory. This commit drop FreeSeqFactory and adds three unsafeAssumePure calls instead, with explanations. Fixes scala#19745
Linyxus
approved these changes
Mar 2, 2024
| // def from[A](source: IterableOnce[A]^): CC[A] | ||
| // override def apply[A](elems: A*): CC[A] | ||
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| // type FreeSeqFactory[+CC[A] <: SeqOps[A, Seq, Seq[A]]] = SeqFactory[CC] |
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This seems obsolete. Shall we drop them?
Another method that was added for the typesafety demonstration, which should be removed now.
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FreeSeqFactory was a construction to demonstrate type safety for certain iterableFactory.from calls where we rely in the fact that for all Seqs iterableFactory has an eager implementation of from.
While that shows that we can make it typesafe, it does not work at runtime as a drop-in replacement for stdlib since of course stdlib does not have a FreeSeqFactory.
This commit drops FreeSeqFactory and adds three unsafeAssumePure calls instead, with explanations.
Fixes #19845