[stdlib] use _copyContents after all

glessard · glessard · commit 03d37a9538f7 · 2022-09-14T16:23:21.000-06:00
- originally had avoided `_copyContents` because all the standard library fast paths were already covered.
- however Swift Collections piecewise-contiguous collections still rely on `_copyContents` to accelerate copies.
diff --git a/stdlib/public/core/UnsafeBufferPointer.swift.gyb b/stdlib/public/core/UnsafeBufferPointer.swift.gyb
@@ -729,7 +729,7 @@ extension Unsafe${Mutable}BufferPointer {
       return startIndex.advanced(by: count)
     }
 
-    var (iterator, copied) = source._copySequenceContents(initializing: self)
+    var (iterator, copied) = source._copyContents(initializing: self)
     _precondition(
       iterator.next() == nil,
       "buffer cannot contain every element from source."

Original file line number	Diff line number	Diff line change
`@@ -729,7 +729,7 @@ extension Unsafe${Mutable}BufferPointer {`
`729`	`729`	`return startIndex.advanced(by: count)`
`730`	`730`	`}`
`731`	`731`
`732`		`- var (iterator, copied) = source._copySequenceContents(initializing: self)`
	`732`	`+ var (iterator, copied) = source._copyContents(initializing: self)`
`733`	`733`	`_precondition(`
`734`	`734`	`iterator.next() == nil,`
`735`	`735`	`"buffer cannot contain every element from source."`