Missing conformances to BitwiseCopyable

[glessard]

Description

Some types should have conditional conformances to BitwiseCopyable, but don't have any.

Reproduction

$ xcrun --toolchain org.swift.62202502171a swift repl
Welcome to Apple Swift version 6.2-dev (LLVM a1d5a03ff545308, Swift d0e4f84cb37b055).
Type :help for assistance.
  1> func bc(_ v: some BitwiseCopyable) {} 
  2> bc(0..<1) 
          ˄
          │error: global function 'bc' requires that 'Range<Int>' conform to 'BitwiseCopyable'
          ╰─ note: where 'some BitwiseCopyable' = 'Range<Int>'

Expected behavior

The following types have good reason to conditionally conform to BitwiseCopyable:

• ClosedRange
• ClosedRange.Index
• CollectionOfOne
• CollectionOfOne.Iterator
• DefaultIndices
• DropFirstSequence
• DropWhileSequence
• DropWhileSequence.Iterator
• EnumeratedSequence
• EnumeratedSequence.Iterator
• FlattenSequence
• FlattenSequence.Index
• FlattenSequence.Iterator
• IndexingIterator
• IteratorSequence
• LazySequence
• PartialRangeFrom
• PartialRangeFrom.Iterator
• PartialRangeThrough
• PartialRangeUpTo
• PrefixSequence
• PrefixSequence.Iterator
• Range
• Repeated
• ReversedCollection
• ReversedCollection.Index
• ReversedCollection.Iterator
• SIMDMask
• Slice
• StrideThrough
• StrideThroughIterator
• StrideTo
• StrideToIterator
• Unicode.ParseResult
• Zip2Sequence
• Zip2Sequence.Iterator

Furthermore, the following non-frozen types should conform but do not:

• ContinuousClock
• ContinuousClock.Instant
• FloatingPointRoundingRule
• MachErrorCode
• POSIXErrorCode
• SuspendingClock
• SuspendingClock.Instant
• Unicode.CanonicalCombiningClass
• Unicode.GeneralCategory
• Unicode.NumericType
• Unicode.Scalar.Properties

Environment

$ xcrun --toolchain org.swift.62202502171a swift --version
Apple Swift version 6.2-dev (LLVM a1d5a03ff545308, Swift d0e4f84)
Target: arm64-apple-macosx15.0
Build config: +assertions

This is swift-DEVELOPMENT-SNAPSHOT-2025-02-17-a

Additional information

rdar://138600947
https://forums.swift.org/t/76379/

[benrimmington]

I've updated this issue, but didn't include generic where clauses (which should be similar to existing clauses for Sendable).

[benrimmington]

Added the concurrency Clock types, which are non-frozen empty structs.